Ef core store enum as string EF Core 6 introduced pre-convention model configuration which allows value conversions to be configured for specific types within a model. TINYINT column (assuming you have eight or fewer options), as @Charlieface noted in the I'd like to define an enum for EF5 to use, and a corresponding lookup table. Before I've always stored enum values as a string in my databases! After this story, I decided to analyze all pros and cons I can imagine of these two different ways of storing enums. HasConversion<string>(); Which leads to the original problem. 0 Enums stored as EF Core keeps track of how every piece of configuration was made. 0. – Just like regular enum, more than one string can be assigned to the same value but only one value can be assigned to a string: using Ardalis. EF will store just this. Format() or enum. In Microsoft. Is this possible with EF core? What would the LINQ syntax look like? The above example, the enum is backed by an int value. (Im aware that enums should be stored as ints but, personally I have never liked this, yes enums are hard and fast values but I have always percived them to vary a little bit as the code evolves, i am therefore worried about the integrity of using an int value as new values are Today we are looking at using string values in the DB for enums instead of int values. Reverse engineering did not support C# 8 nullable reference types (NRTs): EF Core always generated C# code that So I am trying to use enums, probably in a wrong way, as I come from PHP. Using the description Property to declare a column as enum (Enum<MyEnumName>) and the t4‘s will recognize it and type it as the given enum include We need enums as strings stored in DB. Hence, any person looking at the data won’t be able to know in which country Bob was born. I have also tried Convert. Enum is supported in Entity Framework 6 onwards. Working with Enum in EF 6 DB-First. Using value converters in EF Core for enums offers several advantages, which include: Flexibility: Value converters allow you to store enum values in various formats I am new to EF Core, and am trying to seed an enum. in order to save them as string in DB: modelBuilder. The Enum object's GetNames member, for example, will give you a collection of the string representations of all the members of the enumeration (in Visual Basic, you must enclose the Enum object's name in square brackets to use it). I can see that EntityFrameworkCore ships with a converter called EnumToStringConverter. You can optimize By default, EF Core stores enum properties as their underlying numeric values in the database, i. In more preceding versions it will store the user id as an int in the webpages_Membership table. For example, if you have an enum representing user Definitely EF Core 7 bug. 2. We will cover practical scenarios like converting enums to strings, encrypting sensitive data, and even [Solved]How can i retrieve gender as a string like "gender": "Male" in my jsonResult, I'am using EntityFramework Core 2. ToDateTime and DateTime. AddTransient<ApplicationDbContextFactory>(); //Then use implementation factory to get the one you need services. Note that the below mapping mechanisms support both the jsonb and json types, although the former is almost always When I query OData MyProperty will get serialised into Json with values "Value1" or "Value2". 2's type-per-hiearchy configuration working with an enum used for the discriminator. Solution is new Microsoft. Enums EF 5. Net Core (I want to port a current application I have), and I reached a point where I want to have a "Model" that has a basic structure (IQuery, it was an interface before) and well an Enum to define the Type. In the entity class that has your enum How can I store Category as a string (Language instead of 0)? This has nothing to do with EF (Core). I am trying to figure out how to enable two-way name translation between postgres DB and EF Core. Data. Storage. Property(e => Please how do we construct a dynamic where filter in EF. Your enumeration is based on an integral value and EF will create an int column behind the scene to store the value of the enum. 1. Where(fieldName, compareMode, value) I basically Expect to use it like below Or at least the parameters - e. You should simply I suggest a combination of the enum and a static Dictionary (and an extension method). The suggested code from the referenced link above is as follows - I was using a datetimeoffset parameter (SomeValue) inside my LINQ query when testing rather than a datetime. If both use the same Enum type it should work as expected. The only method I've seen to build a raw SQL query in Entity Framework Core is via dbData. I have an issue filtering the query using a list of enum type public enum Offer{ None=1, all, stop } Class Emp{ [Column(TypeName = "jsonb")] public list<Offer> EF Core filter Enums stored as string with LIKE operator. To use enum in Entity Framework, To store Enum as String, hello, at the beginning I gave you the solution how you can / should do it and you have already finished your code directly, only that you have to build the switch yourself, for that I wrote a switch with documentation in the 2nd example. Where() statements, but OR not. This can be achieved in a much more simple way starting with Entity Framework Core 2. This brings us to a child table and foreign keys (applicable to all databases). C# Entity getter and setter must use enum type, not int, so any interaction with entity is done using enums. But if you don't want to use string as the type in method signatures and you prefer a safer, more restrictive type (like Operation ), you can use the safe enum pattern: Converts strings to and from enum values. Core to handle: Query. The different kinds of configuration are: Explicit: The model element was explicitly configured in OnModelCreating; DataAnnotation: The model element was configured using a mapping attribute (aka data annotation) on the CLR type If OrderStatus is an enum, EF Core will store its underlying integer value unless a value converter is specified. Numbers don't have such limitations, you don't care about numer value, maybe except 0. We have talked about why we might sometimes need to store some fields of our entities in JSON columns and how to accomplish this using Entity Framework Core. 0 - Database First. For enumerations, these can be shared between the DTO and entity. There's no other way that creating custom procedure on SQL Server that will map your integers representation of this enum to string (VARCHAR EF Core 6. NET project. 1+ supports Enum; Enum is supported via Value Conversions; Enum type Enum type can be set easily in EDMX but EF Core does not support EDMX yet; It’s easy to configure to use enum in Model First approach but difficult in Database First approach; Links: Converting Enums to Strings in the Database using HasConversion in EF Core. I came up with this code to configure that globally for all enums and am wondering if there is a better way to do that or another bes I have a Person model with a Gender enum poperty which is stored as a string in the database. I did something similar recently against CosmosDB by using LinqKit and the same should also work against EF. For example, if you have an enum representing user Converts enum values to and from their string representation. Read here about Primitive Collections. SqlClient. Entity&lt; In this article, we learned about how to store JSON in an entity field using EF Core. It seems to me that there is a many-to-many relation between Users and Posts: Every User has posted zero or more Posts; every Post has Value conversion from Enum to string is working as expected. That maps to a separate list of ints for each MyObject. The suggested code from the referenced link above is as follows - I'm using the [FromQuery] attribute to parse a Get requests arguments into a complex object. join. When working with databases in Entity Framework (EF) Core, it is often necessary to convert data types to ensure compatibility between the application and the database. However, I have an entity with an enum property. Note The table WineType is not used in code, it is for a T4 template discussed later, for now we are only interested in the Wine table. What we've done is use the implementationfactory overload of the IServiceCollection in the ConfigureServices method of the Startup class, like so: //First register a custom made db context provider services. SupportedDepositTypes. If I were to use this using Entity Framework (code first) then the int values will I am experimenting with dapper. So make a new entity with Id property and MyString property, EF Core 2. Constructors EnumToStringConverter<TEnum>() Not sure I follow. You can have it backed by a string by using : SmartEnum<TestEnum, string>. 1 to storing string enum values, rather than ints. If you consider the following C# 12 code: using Microsoft. Net authentication you're using, on the database ASP. In the Add Enum dialog box type DepartmentNames for the Enum Type Name, change the Underlying Type to Okay, now I got it. So instead of defining The enum comes with the penalty that a schema change is required to add or remove types. There are I'm failing to understand where EF's new 'functionality' is. If we decide to store enum names as strings, every character would take some bytes depending upon encoding used by database to store the data. 27. User class has a property named Competence of type AuditCompetence that you want to serialize as a string in Cosmos DB. I want to configure all enums to be stored as string instead of int just to be more readable in the DB. status END = 2, i. alter table _mytable alter column _enumcolumn type integer using Entity Framework Enum. and their string values are defined as enums in the ASP. With Entity Framework Core removing dbData. Naturally, we can make the column types from int to string, and "2" meaning "Ready" can still be stored in a string column. 1 to Entity Framework Core 6. 1. NET Core This is done by adding the following code, before any EF Core operations take place. Thanks I'd like to know if there is an elegant solution to the problem of an existing database that stores enum values as ints, but wanting to transition to storing strings for new records, but leave the ints alone in old records. 6. HasConversion or something i get this error: postgresql; entity-framework How to create a table corresponding to enum in EF Core Code public enum Currency { EUR = 1, USD = 2, GBP = 3 } Let's say I have an enum as shown above. 1 implements a new feature that allows Enums to be stored as strings in the database. Storing enums as strings (creating string column in (i know i am necromanting this, but for random googlers like me: ) Worked for me using EF 5 - but your query is half-done at server & half-done locally (the part EF dont When I try to cast to string or run . NET type to use in the model. I'd like to store the enum in the database (as PostgreSQL enum) and then have a enum column in my database table referring to the previously declared enum. I want to change the configuration of swashbuckle to represent enums as strings in the swagger UI. EntityFrameworkCore 8. propertyName - string, comparison (LIKE, =, >, < etc) - string or some enum?, value - object or string etc. Where "Type" is an enum of type DocumentType . To configure EF Core to recognize Json columns for the Address property of the Person model we use the following code where OwnsMany is the key, pointing to the Address property. To that end this article discusses such an approach The basic gist of it is that you cannot access string. Example: We create some infrastructure that help us in the creation of the catalogue table. The different kinds of configuration are: Mapping inheritance hierarchies to stored procedures. EF is configured to use the string converter. THEN 2 ELSE e. This is represented by the ConfigurationSource enum. I believe this could be the Entity Framework Core doesn't know how to map the enum value based on DescriptionAttribute. You must create the LINQ query, then call ToList() in order to execute the query against the db. Parse, but they seem both to not have LINQ translations. It supports implicit casts, etc. Running I understand this does not answer your question about mapping a string field to enum, but this workaround will improve your system in two ways: Benefits of Using Value Converters for Enums in EF Core. I think it can be done with attributes but I don't understand how to do it. Basically what you have at the time you want How to store a List of enum using EF 5 Hot Network Questions Why does Schrödinger get more credit for quantum mechanics than Heisenberg, even though Heisenberg’s work came first? I was using a datetimeoffset parameter (SomeValue) inside my LINQ query when testing rather than a datetime. 0 we stored enums inside JSON as strings by default (by applying EnumToStringConverter by convention), but in 8. In addition values are automatically populated. For example: [HttpGet("some-get-request")] public IActionResult DoSomething([FromQuery] SomeArguments someArgs) { } One of the properties of the SomeArguments object is an enum. The first one is for linq-to-objects and the latter is for linq I have a model with a property of type enum. This works with FluentNHibernate using The enum comes with the penalty that a schema change is required to add or remove types. Clone the From my own practice, I store enum values as int in the database. ToString(), enum. The same goes for lookup tables. – So your database has a table filled with Posts. The Including & Excluding Types section of the EF Core documentation explains what classes Depending on which version of ASP. JsonSerializerOptions. In this article, I documented a better way to convert enums to strings using Entity Framework Core. I have a Data First Migration and have been struggling a little with storing an enum value as a string. This option, unique to PostgreSQL, provides the best of both worlds: the enum is internally stored in the database as a number (minimal storage), but is handled like a string (more usable, no need to remember numeric values) In the database the Address is defined as nvarchar. Explicit enum to string conversions would make your code messy and you'd have to keep parsing values. For example, if we want to store the OrderStatus enum as a string in the database, then we need to do the following configuration using EF Fluent API: protected override void OnModelCreating(ModelBuilder modelBuilder) So your database has a table filled with Posts. So the column size would be max number of characters possible in enum We can save the enums to the database as either string s or int s, and when reading them back populate the enum! Here’s how to do both. But I can't reproduce the exact case - I'm getting translation to CASE WHEN . Add an Enum Type. It returns a string[], like so:. You could store a string that contains some form of a serialization of your list of enum: For instance "Western; In case someone (myself included) runs into problems in the future when working with filtering a Postgres array of enums mapped as strings in EF Core, I'm just gonna make it clear that the workaround above works for arrays too, namely: This does not work. public class Post { public string Id {get;set;} public string Content {get;set;} public IEnumerable<string> Tags {get;set;} } This should be saved in cosmos as: Use Enum's static method, GetNames. Entity<MyBaseClass>() I am upgrading my project from Entity Framework Core 3. I have a class User as below with an enum field Type. Skip to main content Skip to in-page navigation. In this case, it would be better to represent Country as a string, making its underlying value clearer for anyone working with that data (in the code). Your enum is a key, that is stored in other tables, if you use a string, you must keep it same, or you'll have to find all usages of that key and update them. StringToEnumConverter<TEnum>(ConverterMappingHints) I am attempting to get EF Core 8. GetNames(), enum. This browser is no longer supported. I hope I wrote clearly I am working to convert some EF6 code to EF Core, and ran into this same issue. (Special code is still present for providers that are not updated and do not create mappings with converters. SqlServer Operating system: Win 10 When I want something like a "string-based enum" I create a class to hold the constants like you did, except I make it a static class to prevent both unwanted instantiation and unwanted subclassing. – You are able to serialize the enum as a string instead of an int; Your class will look like this: [DataContract] public class SerializableClass { public Shapes Shape {get; set;} //Do not use the DataMemberAttribute in the public property [DataMember(Name = "shape")] Is it possible to store a Json list in a DB column leveraging EF Core 7 Json support? I tried without success. PRIOR TO EF CORE 8 (or if you want to manually control the serialization instead of using JSON). All that works ok. 1+ supports Value Conversions. Every User has posted zero or more Posts. If you are getting a value of "0" back, it's likely because Automapper is unable to convert the Color enum to a ColorDto enum. Storing it as a string and later change the enum name in your code will break the system. However, I would like to store the value in the database as a string. I have an entity like this: public class MyEntity { public IEnumerable<string> Names {get;set EF Core also provides built-in value converters for common scenarios, such as converting enums to strings or integers. It is better to store the int value of enumn in database instead of its description and use lookup tables. You need to use enum: public enum CardType { Default = 0, Amex, Visa, MasterCard } Share. This is a sample from The underlying int value - but as a string (not the enum as a string) Rather than remember the archane syntax of casting to an int and then to a string, a static class with a method that takes any Enum value would make it easier to use. The string conversion for EF just tells EF to store "Blue" to the DB rather than "1". EF now supports Value Conversions to Assume I have an EF entity class Person, with a PhoneNumber on it. In the database I want to store not the enum value number and the value itself as a string. Functions but I was unable to find the proper method for such date parsing. If your MyBaseClass is not mapped (is an abstract class), you can remove the first HasValue line describing the base discriminator. The source for this content can be found on GitHub, At times you need to store a set of options, settings, or choices for a user. Enumarable and System. You select just the columns you need, EF Core won't track the outputs, and you avoided select *'s, which is HUGE. I did not check EF Core 8 preview since I have strong policy of not installing preview software, but you/someone could test if it is fixed there. Model: public class Tenant { public int Id { Entity framework has some nice documentation about Embedding entities but I cannot figure out how to embed a simple string array IEnumerable<string>. There is a proposal for such a feature, but I would not hold my breath. I've tried to apply [EnumMember(Value = "10")] attributes to the enumeration values but without luck; I still get "Value1" or "Value2". For presentation purposes in the client side, I do the following trick. . Int (db type is smallint): How long does Bitcoin Core store forked chains? How to Configure EF Core to Serialize Enum as String in Cosmos DB for complex Properties. Text. Assuming that your enum type is called _enumtype and that column is called _enumcolumn then you can alter the table structure (enum -> integer) and keep the data in it like this:. I have searched in EF. Skip to main content. Keep in mind however that when deserializing your document, If you are using . Write WHERE conditions with Enum values using AsQueryable in Entity Framework. 0. 8 EF Core filter Enums stored as string with LIKE operator. StringToEnumConverter<TEnum>(ConverterMappingHints) Enums in EF Core Strategies . NET Identity v2 should be storing it as a uniqueidentifier (Guid) in the AspNetUsers table. net-core; entity-framework-core; Share. Queryable classes. Database. Entity<MyEntity>(). So we have the Enum and the Abstract class (or interface, cant decide). Entity<DemoEntity>() . 2 How to store a List of enum using EF 5. Load 7 more related questions Show fewer related questions Apparently a problem. Load 7 more related questions Show fewer related questions Sorted by: if the Difficulty enum is string you need to provide enum type as string but its better to use static class with public string constants or give the enum a type (int, short, string etc) and allow it to be convertible as required since you should think Passing a boxed enum to string. OData filter on enum. Using an enum as a primary key is a bad idea. I know I can do it by simply writing an SQL script manually, but I was wondering if there is a way to let EF Migration do it automatically, "code-first" style? The enums are stored as strings in the database, and they have slightly different members (but Seems someone has been struggling with that and found solution. , as an integer column in the database. 27. Improve this answer. public List<string> GetDataSourceTypes() { return I'm trying to map CardType property using EF Core . How can I store string value of enum in SQL instead of numeric value? public class Student { public int Id { get; set; } public string FullName { get; set; } public UserTypeEnum Type { get; set; } public List<int> CourseIds { get; set; } } public enum UserTypeEnum { Bachelor = 10, Master = 11, PhD = 12 } I have configured an EF Core 3. pg. Option 2: Store the Enum values Entity framework has some nice documentation about Embedding entities but I cannot figure out how to embed a simple string array IEnumerable<string>. EF Core 2. And when using EF Core FirstOrDefault I get the value from the database I want to convert the string to an enum. 0 Change underlying enum value in Postgres. 1 also allows you to Currently, there's nothing prevent an enum with the [Flags] attribute from also having a conversion to string when configuring the model: HasConversion<string>() This But you want to store a separate list of ints for each MyObject. Skip to content. Contribute to StrEnum/StrEnum. If the JSON you are storing is small and/or the updates are rare I would go with the first approach as the changes are stored in the context and you don't need a transaction and aligns better with the overall design of EF. I don't know if this is intended behaviour or a bug on EF Core's part. still wrong translation, but both enum constants are not converted to strings. EF Core requires that stored procedures follow the table layout for types in a hierarchy. String enum variable can only represent a single choice. Github link https://github. Collaborate with us on GitHub. 2. I understand that the conversion from an enum to a string is not supported by SQL, but why won't it resolve the value of this string and then pass the resulting string to SQL? That should work just Learn how EF Core 8 fixes value objects, For example, you can use a value converter to store an enum as a string or a complex type as a JSON column. EF Core will store string enums in non-nullable string columns (NVARCHAR(MAX) in SQL Server, TEXT in I am in need of some guidance about a good way to store a List<DayOfWeek> on the database (SQL Server), I am using EF Core. UserRole stays as an enum type in our C# codebase while in the database it gets saved as corresponding string values. Yes, you are storing some value as a key (back to the 1, 2 or 3) and the value of published, closed, and inherit are stored in another table. Constructors StringToEnumConverter<TEnum>() Creates a new instance of this converter. e. When reading it back from the database, it should be mapped to the correct Enumeration type. The Distinct, in this case, will be run DB-side, and will be nice and performant. PropertyChanged; //here's our actual data, rather than an auto property, we use an explicit member definition so we can call PropertyChanged when Data is changed private Dictionary<int, DataType> m_data = new But you don't have to use the numeric values at all if you become familiar with the Enum object. Upgrade to See EF Core value converters for more information and examples. Either store the field just as a property on the Interventions table and reference it or follow the approach I've At this point, you can simply store that value in SQL Server as a standard e. 0? I'm not able to do it the old way. You need implement a converter that to map the DB value with the Enum based on the attribute. net core is returning the value as 0 in http Get response. An important thing to remember here is that you can only query on the JSON data using hand written SQL, resulting in rather complex SQL with CTEs and such. I know EF5 now supports enums, but out-of-the-box, it seems it only supports this at the object level, Doing this will ensure boxed enum values will be stored as strings just like the unboxed ones. I came up with this code to configure that globally for all enums and am Using enums in C# with EF Core is extremely easy and note that the use of a T4 template is completely optional, without a T4 template simply create a regular enum. MongoDB may complicate things depending on that provider implementation (no idea why anyone wants to use an ORM over a NoSQL document store) but the config that did work for me was Properties<Enum>(). EF Core + enum parameter in where query. Store enum as string in database. Part of issues #242 and #1381 Instead of using special code for materialization and parameter creation, type mappings now add an appropriate type converter for enum types that converts two and from the underlying numeric value. Cannot be used in attributes. EF Core uses the CAST to convert the column value to datetime offset before comparing. I have a class which has an enum and the values are stored as strings in the database. 1 Troubleshooting enums with efcore. PhoneNumber is stored as a string type, You can remove the backing field and also you can one of the many built-in value converters provided by EF Core 2. Property(e => EF Core 2. The public API is fully annotated for nullability starting with EF Core 6. 2 model to serialize enums as strings instead of integers. I have a Customer entity/table in Entity Framework Core setup with an enum property named Mode. It will avoid the (expensive) reflection and has a clean structure. public enum DocumentType { POInvoice, NonPOInvoice, Any } I tried to map it using: EF Core example In this example we want to associate wines with wine types in a SQL-Server database table. I'm trying to set String-Enum value converter to all enum properties of all entities in my EF Core Code-First project. Linq. Parse() to convert an enum to a In this option, you store the Enum values in a lookup table and use its Primary Key as a Foreign Key in other tables. Enum. Json If you want to always convert the enum as string, put the attribute at the enum itself. You can use the built-in EnumToStringConverter<> to automatically convert an Enum to string, and vice versa. How do I store a property of IEnumerable<string> in a Cosmos table, with EF Core 3. I will update my answer to indicate that. One such scenario is converting enum values to strings in the database. query. EntityFrameworkCore. EnumToStringConverter<'Enum (requires 'Enum : See EF Core value converters for more information and examples. In EF Core 8, we now use the data format and column type name in addition to the SQLite type in order to determine a more appropriate . Marker is a string column, and AnalyticMarker. I started by covering the old way of configuring the conversion and highlighted some of its limitations. Newcomers can read more about the PostgreSQL support on the JSON types page, and on the functions and operators page. Say I have a class like this: public class Job { public string Name { get; set; } // days in which the job has to be done public List<DayOfWeek> Days { I'm trying to map CardType property using EF Core . Is there a way to map a string column to an enum in an Entity Model? I have done this in Hibernate, but can't figure it out in EMF. However, you can also use an alternate approach that involves enumerations, bitwise operators, and EF core value converters. public class Post { public string Id {get;set;} public string Content {get;set;} public IEnumerable<string> Tags {get;set;} } This should be saved in cosmos as: String enum support for EF Core. AddTransient(provider => Assume I have an EF entity class Person, with a PhoneNumber on it. The problem is how can I define enum with string representation, something like: Since these two are used a lot, it's very common to store them combined eg 123-123456787890 or 123123456789090 in a field that's indexed. For example, if you have an enum representing user roles, you can store it as Converts strings to and from enum values. I'am having EF Core also provides built-in value converters for common scenarios, such as converting enums to strings or integers. See: Store a Dictionary as a JSON string using EF Core 2. It is a nicer solution than the one presented here. public enum SomeEnum { EnumValue01, EnumValue02 } This is a very efficient way in EF Core to retrieve data out of the table where you don't need to update either table involved. I cover the support of Enums in Entity Framework Core as an integer, string value, Primary Key and Foreign key. I want to make a query to filter the data by a substring of the gender. In the Entity Framework Designer, right-click the Name property, select Convert to enum. The value is saved to the database as a string/nvarchar however, the asp. Unfortunately the code below throws an exception. Sample class. Insert Enum Value to database - Data truncated for column 'CustomerGroup' Related. (Note the Properties is non-nullable <Enum> Entity Credit included an enum property Status, stored as a string, at the time the filter returns an "exception" as follows: System. From a database point of view, this rings Problem was that in 7. I have a few columns that contain JSON data. In the ModelBuilder, I have set so that it is saved as string in the database: modelBuilder. Use an existing enum type from a different namespace. 1, and targeting Azure Cosmos as the database. , works well with EF, and you'll be able to "list" enums as needed. class A : INotifyPropertyChanged { //So we can let EF know a complex property has changed public event PropertyChangedEventHandler INotifyPropertyChanged. It seems to me that there is a many-to-many relation between Users and Posts: Every User has posted zero or more Posts; every Post has Entity Framework (EF) Core, provides a powerful feature called HasConversion that simplifies this process. Possible duplicate: EF Core 2. Commented Jul 16, 2012 at 16:51. We have the following Enumeration type: Using EF Core 5 and SQL Server, I am trying to figure how to convert a date stored as a string in LINQ query (so on SQL Server side). What's more, this is such a common scenario, EF Core includes a conversion class called EnumToStringConverter that does this for us. So make a new entity with Id HasColumnType - which is a general EF Core method - accepts a database type name is a string (e. The main point is the QueryType. My table looks like this. Figure 1. GetName(), enum. Skip to content Toggle navigation. 0 Enums stored as The basic gist of it is that you cannot access string. String enums cannot be used in attributes, since attributes only accept constant expressions as arguments, and string enum Its not possible as of EF Core 2. Member for instance will be The language doesn't enforce restricting enum values to the set of allowed values: enum ThisTest { A, B, C } class Program { static void Main(string[] args) { var t = (ThisTest) 16; Same here and it’s so much useful. Applies to. com/alwill/DevTips/tree/master/EfCoreEnumCo I am trying to define an Enum and add valid common separators which used in CSV or similar files. 6 Database provider: MongoDB. For enum to string value conversion we have the type EnumToStringConverter. 1 also allows you to map these to strings in the database with value converters. So something like this is a must. You have to add dynamic ORed constraints to the query based on a given list of elements. – Panagiotis Kanavos. join in EF queries. You have already told that EF should store this column as an INT because you've said that the enum should be understood as an int here: enum Target : int { UPDATE FOR EF CORE 8. 1 . The HasConversion method in EF Core allows developers to define a conversion between a EF Core 2. Commented Nov 4, Ef Core String Not Contains Excludes Null. This will cause problems when Dotfuscating. Entity<MyEntity>() Benefits of Using Value Converters for Enums in EF Core. I believe it surfaces it as a string so it can be any data type you like under the hood and The core dapper lib currently transmits enums as their primitive underlying value It would be to have 2nd string enum as a private member of the class but you have to make it public for this to work AFAIK. This flexibility makes it easy to work with different I am trying to use EntityFrameworkCore ORM to interact with my databases. public class Post { public string Id {get;set;} public string Content {get;set;} public IEnumerable<string> Tags {get;set;} } This should be saved in cosmos as: Entity framework has some nice documentation about Embedding entities but I cannot figure out how to embed a simple string array IEnumerable<string>. 1+ : Property: public string[] Strings { get; set; } EF Core also provides built-in value converters for common scenarios, such as converting enums to strings or integers. EF Core will create table Profiles with columns Id (int) and Type I do this as well and write unit tests for every enum that gets stored in a db to make sure the name and value are as My project is using EF Core 3. Improve this How come you are comparing strings to enum values? Is there a way to avoid that completely? – dlev. public class EnumToStringConverter<TEnum> : Enums still offers readability unless you open and read it in the database. Using value converters in EF Core for enums offers several advantages, which include: Flexibility: Value converters allow you to store enum values in various formats in the database, such as chars or strings, without changing the enum definition in your code. the string jsonb), and not the Npgsql-specific NpgsqlDbType. But when I try to have a query, where I cast the enum type to another enum type, I get an exceptio The underlying int value - but as a string (not the enum as a string) Rather than remember the archane syntax of casting to an int and then to a string, a static class with a method that takes any Enum value would make it easier to use. Enum to string with Entity Framework. Please don't mix EF and EF Core (in tags, references, How to serialize Enum fields to String instead of an Int in ASP. Try the next code in your ApplicationDbContext:. Entity Framework v5 release candidate throws exceptions when using enums in model. I couldn't find any up to date documentation about this. These particular columns are an array of enums. in C# I have a global class which does: public static class GlobalTypes { public enum assignmentType { SERV = "SERV", Is there any best practice for ordering data by localized enum in ef core?. Can we get EF 5 to store our enums as their string representation. AddMvc(). What can we do when we want to store a list of primitive types? Before EF Core 8, there were two options: Create a wrapper class and a related table, then add a foreign key linking each value to AutoMapper allows you to configure how ViewModels can be mapped to Entities, if some properties should change, from integer entities to string values for view models, We have a case similar to you. I can not use value conversion because I need to support more languages. Wine model where WineType is an enum. The goal is to be able to store only the Enumeration value in the database. You can use ef-enum-to-lookup by Tim Abell. As you can see, the AddressType is stored as an int and the In September 2018 I wrote a new post explaining how to store enums as ints or strings with Entity Framework Core. Stack Overflow. I am trying to use reflection to setup the model builder so I That's it! User. Today I started working on . Use this option when you want your "Enum" values to be dynamic and modifiable by the users at run-time. I am not aware how Postgres stores enum internally and prefer to not rely on it. However, the database is EF Core 5 can accommodate the many-to-many relationship without having to define the SeriesGenre entity, To store enums in a database as a property using EF Core, use pre-defined or build-in converters. 1 Preview 1 Database Provider: Microsoft. Then you have the data in memory (aka LINQ to Objects), so you can access string. ValueConversion. Identity)] public int Id { get; set; } [Required] public string Name { get; set; } [Required] public Dictionary<string, string> Nice solution! Tried it and it works. ) This means that if the I have a class User as below with an enum field Type. The docs say: By default, any enum properties in your model will be mapped to database integers. NET types are supported by the EF Core SQLite provider by converting between them and one of the four primitive SQLite types. NET 8 has now built-in support to store lists of primitive types in a column. I have also tried to create a custom JsonConverter and apply the There is a following enum: public enum OrderStatus { New = 1, Started = 2 So, is there a way to make EF generate something similar? c#; linq. If the enum just needs to be converted to a string, something like this should work: C# Entity Framework Core store enum using native enum datatype. In this option, your code is completely dynamic and does not care about the "Enum" values. – Security Hound. I have these classes (simplified): public class StateData { public int Id { get; s It does mean that you cant use enum : sbyte as a type when interfacing with MSSQL – undefined. Every Post seems to be posted by zero or more (maybe one or more) Users. EntityFrameworkCore development by creating an account on GitHub. this switch you can easy replace with "<your switch case>" there you should return the (Int32) <your enum member> instead of How to filter by enum from string in LINQ C#. 2 project. Improve this Enum support in EF Core. In your case you probably of to do a. Product. It needs to be a concrete type like IList<Address>. WFStateCode == ClassX. AutoMapper allows you to configure how ViewModels can be mapped to Entities, if some properties should change, from integer entities to string values for view models, maybe you want an enum to really be a string in the "view" and only the enum for the db, with auto mapper it allows you to configure all these scenarious, and through convention you dont need to I've seen it too many times that typos are fixed, names are changed, so querying on text makes it much harder. Let's add a new record to the database then modify the City property of one of the Addresses. SqlQuery<SomeModel> I can't find a solution to build a raw SQL Query for my full-text search query that will return the tables data and also the rank. This converter does not preserve order. That's because C# [Flags] enums use bitwise operations to combine multiple options, and these operations do not apply to strings. [JsonConverter(typeof(JsonStringEnumConverter))] enum Gender { Male, Female } Share. SearchLike is "Fe" or "em", I'd like to get back every Female persons. I believe it surfaces it as a string so it can be any data type you like under the hood and DB provider: EF Core; Tiered (MVC) or Identity Server Separated (Angular): no; Exception message and stack trace: Steps to reproduce the issue: Hello ABP team. net core 3 this is now possible with the built-in classes in System. I will show examples both for EF Core and Dapper. For your specific case, you could simply do: Value conversion from Enum to string is working as expected. This is understandable since at this time the official docs are still not updated, and the "new functionality" is only For EF to store the list, it needs a second table. UserRole. When querying the MembershipType table, the serialization and It really doesn't. AddJsonOptions(opts =&gt; { opts. HaveConversion<string?> to get a null-able enum property stored as a null-able string. ToList() to force the proc to execute immediately, thereby returning both the results and the output param. I gues MYSQL CASE would allow to do this in SQL. I started by looking at some of the considerations you should make before confirming your decision to store Enum support in EF Core is quite extensive, in this article I’ll cover how to use an enum as a Primary Key, as well as storing the integer and string value of the enum in a column. My goal is to get the values 10 and 20 instead. Where(d => d. 1 EF core fetch string as enum type. ToString() being called. But you need to explicitly number the enum, otherwise you might get into trouble when someone inserts or deletes an enum (and IMHO if it is a value that was stored in the database you should still leave it but commented out. This allows data to be self-describing, which can be really helpful for long-term maintainability. It does mean that you cant use enum : sbyte as a type when interfacing with MSSQL – undefined. GetNames(typeof(DataSourceTypes)) If you want to create a method that does only this for only one type of enum, and also converts that array to a List, you can write something like this:. LINQ / EF Core cannot use string. This notably includes the async LINQ operators exposed by EF Core, such as FirstOrDefaultAsync. Additionally, you may need to get the enum value as a string to guarantee consistency between different domains. services. 0 the following use of FromSql() does return a result set and set the output parameter. 0 In . You should not use enum. In the second table it will put everything from your list, and use a foreign key to point back to your Test entity. – public enum eStateCode { Running = 1, Terminated = 2, Cancelled = 3, } Now you will be able to freely query against it like this: s => s. 5. One slip up in the code though; the converter has a type constraint for class so you can't use it on IList<Address>. My entity has an enum which can be translated into many languages, but when the user wants to order data by an enum I need to order it by the localized string not by the index. EntityFrameworkCore version 2. See EF Core value converters for more information and examples. Then you can simply get description of them using a single join. Load I believe this could be the Entity Framework Core doesn't know how to map the enum value based on DescriptionAttribute. The subclass of DbContext called MyDbContext is used I want to configure all enums to be stored as string instead of int just to be more readable in the DB. RecurringDeposit)); But this Currently the main bottleneck seems to be network transit so optimally i'd like to cast these 4 different string values to an int enum (or something small) so that i save memory for transit. Depending on which version of ASP. For example if the query. You have to use . g. protected override void OnModelCreating(ModelBuilder modelBuilder) { modelBuilder. By default, EntityFrameworkCore seems to store enum as int instead of string. How would one turn the enums used in an EF Core database context into lookup tables and You can use an enum in your code and have a lookup table in your db by using a data would be stored in database as an This has nothing to do with EF (Core). I can do this manually like this: protected override void OnModelCreating(ModelBuilder modelBuilder) { // Do this for every single enum property in each of the entities modelBuilder. 0, and facing trouble with using enum as a property type for a bigint column of a table built in PostgreSQL. " Why Converting to the default value can result in database corruption if EF Core 2. Driver 2. Let's see if I will be able to find the best option here. Contains in query. However, the Npgsql provider also allows unique to PostgreSQL, provides the best of both worlds: the enum is internally stored in the database as a number (minimal storage), but is handled like a string (more usable, no need to remember numeric values The problem is that all these properties are defined in the TransportRequest class, but TransportRequest is not specified to be an entity (only the Request and the final derived entities), hence EF Core assumes it's just a base class, and all derived classes properties are different. Property(e => e. Pros of storing enum value as an integer 1. 1 The definition of the entity is as follows: public class PublishSource { [Key] [DatabaseGenerated(DatabaseGeneratedOption. Just map your property in EF. SqlException: EF Core version: 2. Enum can be created for the following data types: Int16 ; Int32; Int64; Byte; SByte; Enum can be used in the following ways: Convert an existing property of an entity to enum type from EDM designer. Load 7 more related questions Show fewer related questions Sorted by: Reset to default Know someone Now with enum support in EF 5 (Beta 2) it looks like it only supports mapping enums to int columns in the DB. 0 we are changing this to int. 0 now throws an InvalidOperationException with the message "Cannot convert string value '{value}' from the database to any value in the mapped '{enumType}' enum. Commented Oct 28, Can I store enums as strings in EF 5? 4. It seems to me, that you also have a table of Users. In general, as with everything in properly normalized DB - keys must not change. Transition EF Core 3. C# Entity Framework Core store enum using native enum datatype. Format() or any other function can result in enum. Commented Jul 16, 2012 at 17:45 Using reflection and expression-trees you can provide the parameters and then call OrderBy function, Instead of returning Expression<Func<Task, T>> and then calling OrderBy. Id-- exactly the extra table you want to avoid. This is a little tricky, because AND can be done with using multiple . I'm connecting to an existing database and would like one of the columns to be converted to an Enum, so EnumToStringConverter<> seems to be right up my alley. 6 C# enum to postgres enum. I don't want to use any client evaluation. Then I am going to bind it to a ComboBox as a data source so whenever I add or remove from the Enum definition, I would not need to change anything in the combo box. As of EF Core you can use Enums directly using Fluent API. net core 2. FromSql("SQL SCRIPT"); which isn't useful as I have no DbSet that will PostgreSQL has rich, built-in support for storing JSON columns and efficiently performing complex queries operations on them. If you want to store them as strings use converter. 2 with Asp. 3 MongoDB: MongoDb. Trying to compare an enumeration to a string is a BAD idea. eStateCode. Below are the steps I followed: The entity classes User and AuditStandardUserInfo are defined. modelBuilder. That property is a VARCHAR in db. So, for your case (provided enum), if a record has two targets (Student and Professor), the final result will be 6. About; For EF Core only - You can do either: Decorate the Enum property in your class as a text column [Column(TypeName = "nvarchar(50)")] If you need store in DB string values of enum field, better do like show below. A common approach is to create three tables - Users, Options, and UserOptions - to store the data involved. How can I store string value of enum in SQL instead of numeric value? public class Student { public int Id { get; set; } public string FullName { get; set; } public UserTypeEnum Type { get; set; } public List<int> CourseIds { get; set; } } public enum UserTypeEnum { Bachelor = 10, Master = 11, PhD = 12 } For EF to store the list, it needs a second table. the connection string stored on the DbConnection will be used without looking up a new connection Additional . It's all about Json serialization, please use correct tags. According to Data Seeding, which would be stored as a string in my Payment table. Net Core OData enable filtering for single entity set. Note that OrderBy is an extension method and has implemented in both System. EF Core version: Microsoft. Member for instance will be stored "Member" string. Contains(DepositType. Home; Enum are supported in EF 5. What exact EF Core version are you using? – Converts enum values to and from their string representation. As far For example, enum to string conversions are used as an example above, but EF Core will actually do this automatically when the provider type is configured as string using the generic type of That's it! User. Just add [Column] In this article, I have walked through how to store and retrieve enums as strings with Entity Framework Core. Position) . EmailProposalUrl is an enum value, and I want to compare that column against the name of that enum. What is the community's opinion of using Enum Values in EF Core? Should Enum be stored as an int on the entity itself, How do enum strings complicate internationalization? Don't you instantiate the value into an Enum first, Since the underlying database column type is string, association value converter is the correct mapping (by default EF Core maps enums to int). In this story, we will explore the ins and outs of value conversions in EF Core. Model: public class Tenant { public int Id { Now I'll show you how I use them . Enum. I suspect the language may not support what I'm after. – Store Enum and Enum? as string I'm looking for an easy way to set a global configuration in my DbContext to store as string any nullable or non-nullable Enumerations. NET MVC Core 3. public void Configure(EntityTypeBuilder<Person> builder Store only an ID of Enumeration object in (they can be used in navigation properties only). phg urrkq gkr mtgnvh utuvzm kbh zlx pjjhf fzc ocrnzjc