Entity framework int to enum. It also demonstrates how to use enums in a LINQ query.

Entity framework int to enum net core Enum Nullable object must have a value. The code also defines the DepartmentNames enumeration. Community Select the enumeration type property of the entity. EF5: only supported if you are targeting . In it I have a bool column in a table. 0 mapping enum to tinyint in SQL Server But Now I would like to add an enum as part of the Subscription model. Here is my Enum class: [Flags] public enum TypeNames { Een = 0, Twee = 1, Drie = 2 } Here is my Grounds class to create the table with the 'TypeNames'-enum. AddAsync(response, cancellationToken). 5. NET Framework 4 did not support enums and the application would not work on a machine that has only . Hot Network Questions Do indoor-outdoor cats really have 10 years shorter lifespan than indoor cats? How to keep meat in a dungeon fresh, preserved, and Entity Framework is supporting enums directly since version 5. EntityFrameworkCore. 4. Is this possible in Entity Framewor I have an entity called Comment, which has an enum property of type CommentType:. The database will then automatically have that column be the same type as the enum (tinyint, smallint, int, bigint). And put an entity framework "ignore" attribute on CountryId. The enum does NOT have a corresponding database table. Int'. 77. use entity-framework to map int column to enum property. Commented Sep 12, 2015 at 19:26. Entity Framework supports enums now and there is no need to cast the int from DB to it's enum respective value . How do I map a C# int to a SqlServer tinyint using Entity Framework Code First? 5. I am trying to map an Enum value (Int16) to an IQueryable projection so that the string representation of the Enum value is used rather than the integer value for the database sorting. To give a summary of enum support in Entity Framework code first: EF4: Not supported. 3. How to use an existing enum with Entity I was thinking the Convert. Then you can simply get description of them using a single join. In this case, reordering the enum to be: Entity Framework Core does not support translating enum types to SQL. public enum MyEnum : int { Zero = 0, One = 1, Two = 2 } This is my class, it has its own table in the database. 2 How to convert database table entry to an enum? Load 7 more related questions Show Read more about enum support in EF code first here. Unless you have a very good reason to have it as a string in the DB. Where(item => types. EventType. It is better to store the int value of enumn in database instead of its description and use lookup tables. Improve this Or you "pseudo-sort" your enum, and use the mapped int. MaxValue), Display(Name = "Test Enum")], and you won't have any issues with future added enum-values unless an incorrect int-value is manually entered, if you really need to you can add custom validation to defend against these cases for instance by letting the TestEnumClass implement IValidateObject. I think the solution is an acceptable one for my scenario, but you are right: I cannot query for objects that contain some values (at least not without using string operations) - but in my case this is not required (I did not mention I am just starting to learn a bit about the entity framework and don't have much experience with ORM's. Rather than worry about casting an Int to an enum, or an enum to an Int, a better solution might be to change the Entity to bind that column directly to the enum and letting the Value conversions are configured in DbContext. This is my first time using EF and I started with EF5. Enum in EF has same limitations as enums in CLR - they are just named set of integer values. The clr cant imagine casting an int to a string and Entity framework cant figure out what SQL snippet to translate . Mathieu Guindon. 2 project. For the second enum, AddressType I don’t explicitly need to convert it from an enum to an int, Entity Framework will do this automatically (as pointed out to me in this tweet). 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 In Entity Framework, an enumeration can have the following underlying types: Byte, Int16, Int32, Int64, or SByte. EFCore enum to string This table could be constructed in a classic way, with a primary key (Id) and value (genre enum value). 1 Enum Conversion I want to restrict values of a property of an entity in Entity Framework. Modified 3 years, 11 months ago. The code registers this value converter using 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. 1 to storing string enum values, rather than ints. 1 Enum Conversion failed when converting the nvarchar value 'EnumValue' to data type int. Entity Framework Core 3. In other words, your categories be persisted in your database, then you need to create a class like: public class Category { public int Id { get; set; } public string Name { get; set; } } Share. 27. This does make sense, as there are far more values possible for an int than there are for a BarEnum. You should really save it as so. When I imported this table into it automatically assigned the Flags' datatype as a byte. Cheers! Then, in code, we have an interface that mimics the table, that however has the enum instead of the int. Using a flag in an Entity Framework Where clause. Workaround for DefaultIfEmpty. Ask Question Asked 8 years, 3 months ago. NET Framework 4 the enum properties were not discovered and added to the model since EF 4 which was part of . Commented Feb 9, 2016 at 18:24. I need to add information about number and the type of beds in every room. – Romias. public async Task<Response> InsertRecord(Response response, CancellationToken cancellationToken) { await dBContext. 2 with Asp. The approach I used was taken from here. This works out quite well. @Tigran, just the int value of the enum combination of flags. Convert to Enum. Viewed 1k times 0 I have code-first generated database. 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. asp. TypesExclus. You can have it backed by a string You do not have to do anything. as bit is included in integer in most DBMS and enums are mapped to integer columns, you can simply change the column type to As per your comments - since you targeted . Entity: Entity Framework Enum and string association. 1 needlessly casting smallint. By using ComplexType the List data (in this case the string) is stored in the same table as MyObject. The property for the enum will maps to member for its get/set. Follow edited May 23, 2017 at 12:25. Enums are supported in EF5 for . 8 Convert to Enum. Watch the video. Repository. My use entity-framework to map int column to enum property. Where(doc => query. Exception value is obviously 'exception' while Posthresql enum_logs_eventType contains 'Exception'. Full list of built-in converters can be found here in the documentation . Joseph Hutton Joseph Hutton. Entity My use case is that I want an enum with a 1:* relationship with another entity in the DB. That all works fine. EF code first cannot convert type to int. TypeDocument)); With entity framework 5. @Joe: Set the validation attribute like this [Range(1, int. Storage. 0 onwards you can just use your enum : namespace MyProject. EntityFrameworkCore; using Microsoft. EF5 Enum mapping to external type issue. 53 5 5 bronze badges. Enum defined as IsOptional cannot be queried for null values. The smallest type you can use as the underlying type is byte. 1 and trying to do a simple query on an enum property in my entity in my localdb and I keep getting this error: Enum conversion failed when converting the nvarchar value 'Accountant' to data type int. 1. Contains(item. 3) data model. Viewed 56k (numeric representation) to an enumeration value in a LINQ query, without materializing the query. Any(type => (int)type != (int)doc. AutoEF (0. I'am having trouble in enum, but in this exa Actually this is a duplicate of C# int to enum conversion. 10. Entity Framework can only see an enum value for what they technically are: an int. Example. Entity Framework 5 Enum that is built from a db table. For example: public class Position: EntityBase { [AnAtribute("Values:1,2,3")] public int Status { get; set; } public string ReferenceCode { get; set; } public string Location { get; set; } public string Content { get; set; } } Also I would recommend you to use enum instead of integer for Status field (if it is Since enum defaults to type int, [Underlying Type:{Byte}] doesn't match type of [External Type] {MyEnumType:Int} so to fix it for my original tinyint field you need to define your enum like this: public enum MyEnumType : byte { One, Two, Three, All } Entity Framework Core 3. I have an entity and an enum like this: public class RequestType { public Guid RequestTypeId { get; set; } public RequestActionEnum Name { get; set; } public ICollection&lt;Request&gt; The enum is. To store enums in a database as a property using EF Core, use pre-defined or build-in converters. Probably the simplest fix is to use zero (first enum value) as the default. 8) against my Entity Framework (6. public enum Status { Open, Closed } EF 4. 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 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. Open the properties window. Enums are used in EF only for properties so you configure them in the same way you would configure primitive properties. However, when I took a look at the database I noticed that in the database the enum was actually stored as an integer, not as an enum as I had expected. Really basic. ConfigureAwait(true); await What enum would that be and what would be its values and labels? Even if you could tell the tool that a specific column is an "enum" you'd still have to manually enter the labels. In my little app I have one table, this sql server table has several columns including a PrimaryKey (int) a Name (string) and a Flag (tinyint). I've found a workaround to do this: I've got an enum : public enum QueuePriority { High, Low } I've added these properties to the Subscription class: public int PriorityId { get; set; } public QueuePriority Priority { get { return (QueuePriority)PriorityId; } set { PriorityId = (int)value; } } And Declare You can use this to convert all the Enum of all the properties of all the entities into a string and vice versa : using Microsoft. public int? As of EF Core you can use Enums directly using Fluent API. Map a field to an enum in EntityFramework 5 Code First. net framework 4. Commented Nov 14, 2021 at 9:25 Using Enums in Entity Framework Where Clause. 5 and EF6 for both . too much downtime). Int32'. Hot Network I would like to use AutoFixture (3. So first you would have to convert your bit column in the database to tinyint and then change your model to use an enum whose underlying type is byte for the property which ) although here I'm specifically asking about the fluent API for Entity Framework. OnModelCreating. Cast int to enum from sql query C# Entity Framework. In postgres I declare enum: CREATE TYPE public. Changing a bool to an enum in Entity Framework - code first. You can simply replace your properties definition as follows: public EventType EventType { get; set; } public EventTopic EventTopic { get; set; } When I check the response data type it is actually the correct enum and not integer. For e. documents = documents. Entity Framework Core 2. net 4. EntityObjectDatasource and where clause on Enum type field. How can I use the entity framework in order to present the customer class in the edmx? EDIT: All the solutions I found assumes that the enum values are the same as the status_id in Customer table. I simply cast the enum to its underlying int32 data type but it does not retrieve me the results I want. public class Intervention { public int Id { get; set; } public string Description { get; set; } public int InterventionStateId { get; set; } public virtual InterventionState InterventionState { get; set; } } public class InterventionState { public int Id { get; set; } public string Name { get; set; } public virtual ICollection<Intervention> This is currently not possible. 71. ToInt32 would return the (old) actual integer value from the database, but it's trying to map the integer value to those (new) defined in the Enum definition. 0 mapping int to SQL Server smallint throws exception on query. class User { int id; IList<Roles> Roles; } enum Roles { Worker, Manager, Director } Or in this representation for clarity I have an issue receiving the following error: Conversion failed when converting the nvarchar value 'HolidayRequest' to data type int. Let's assume in the table Person we only have the gender While with string or int conversion you have to change the database column type. Enum Condition in Linq Query in C#. Customer = 1 and Friend = 2 so the combination is 3. 21. The resolution for this was simple: Just change the Id of Bar to use the enum as well, and everything worked without a problem. Convert String to Int in EF 4. Check this article for confirmation:. – Ivan Stoev. 1 Enum Conversion failed when converting the nvarchar value 'EnumValue' to data 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. 0. Add a public class Part { public Guid CarId { get; set; } public Guid PartId { get; set; } public int Enum { get; set; } public string EnumName { get; set; } The problem is when I try to get entity from context which has some enum inside of it. 2. public class Comment { public virtual Guid Id { get; private set; } public virtual CommentType CommentType { get; set; } // other prop removed for simplicity } public enum CommentType { Comment, Correction, Improvement, BugFix, NewFeauture, Other } So here is what I have for my enum. Follow asked Mar 10, 2020 at 8:40. By default, the enumeration is of int Could someone please explain how I can use Automapper to map from DB int value to a string, using Enums as the collection. I want to do this because in SQL Server an int is 4 bytes while a tinyint is 1 byte. EF4 doesn't support saving Enums, so the entities save an int? and the property for the enum on the object isn't mapped into EF. I have tried this. g. Using a enum with flag in an Entity Framework query. EF6: only supported if you target . bool type in C# is not a valid underlying enum type. Entity<MyBaseClass>() In this question, I discovered that enum changes are not handled by Entity Framework migrations. Enum in Entity Framework - how to create it. EF will store just this. protected override void OnModelCreating(ModelBuilder modelBuilder) { modelBuilder. PostgreSQL and MySQL do have enums, and NpgSql does map PostgreSQL enums to C# enums, but even there scaffolding only adds the mappings. 40. But I’m including it as an example in case you use entity-framework to map int column to enum property. So how do you write a linq statement that returns a string instead of an int? entity-framework; Share. Then we extend the entity class by giving it the interface. – Pierre-Luc Pineault. Now I'm starting a project using Entity Based on the comments I would model the entities like so. I have an inheritance structure within Entity Framework. The EF enum type definitions live in conceptual layer. The easiest thing to do, in my opinion, is to create a simple definition table ( PhoneRestriction ) with an Id and Name / Description columns, then create a many-to-many relationship between PhoneNumber and PhoneRestriction in your DbContext . – The issue was caused by using the default value of Mecury (0). Modified 8 years, 3 months ago. The enum table is updated at app-start off the actual enum in code and any non-existent enums are deleted. Simplest way to cast nullable enum to underlying nullable number. Entity Framework presumably is unable to tell the difference between an uninitialized enum and one purposefully set to 0, so it assumes the former and sets the default. 1 Domain Model. Convert Enum From String To Int In DB Then Back To String - Entity Framework Core 3. NET Framework 4 and . Using an enum with Entity Framework. Entity Framework (5 onwards) supports mapping a field to an enumeration, but only for byte, sbyte, short, ushort, int, uint, long, or ulong types. I was thinking and I decided that List of enums will be better, than storing it in separate table. response. 5) package to help fix up the entities and avoid the circular references generated by the relationships. My enumeration used int values between 0 and 9, so I ended up doing something like I'm using Entity Framework Core 3. I am upgrading my project from Entity Framework Core 3. Linq get rows by enum values. How do I go about reading the raw integer value as it is, even if there is no longer any corresponding Enum value defined? Cast int to enum from sql query C# Entity Framework. public enum ItemType { Build, Stock, Shell, Parts, [Display(Name="All Vehicles")] AllTypesOfVehicles } I am trying to select certain records in an EF Linq Query by using this enum in the where clause. 0, and facing trouble with using enum as a property type for a bigint column of a table built in PostgreSQL. Posthresql enum values are case-sensitive. How to use an existing enum with Entity Framework DB First. 1 to Entity Framework Core 6. Follow edited Oct 2, 2013 at 12:18. For example: public class PocoEntity { public string Status { get; set; } } public static class PocoEntityStatus { public const string Ok = "ok"; public const string Failed = "failed"; } An enum value is an int. So when I tried to fix this issue, I ended up here. ValueConversion; using System; namespace MyApp { public class DatabaseContext : DbContext { public DbSet<UserContext> Users { get; set; } We have since moved to using Entity Framework 5 and CodeFirst, but our lookup values are still in the database. ToString() into. Commented Mar 17, 2012 at 13:37. Unfortunately it does not work. 5 which is an in-place update) installed. 1. This video shows how to use enum types with Entity Framework Code First. Although C# COULD call tostring(), its not correct for it to do so. ComponentModel. Your model has a property of that enum type, just map it as you would any other property. You can try to convert the enum to an integer before performing the comparison. One of my classes has a enum property. If you check out the signature of the MapFrom method, you'll notice that one of the overloads takes a parameter of type Expression<Func<TSource, TMember>>. Assume that we have the following sample table: I get the following exception when I try to map an enum to smallint in OnModelCreating:. public class MyEntity { public int StatusId { get; set; } public virtual Status Status { get; set; } } Dto being used on website I want to create a enum type column named 'type' but when I reverse engineer my Code First generated DB it assigns it as an 'int'. net core 2. c#; linq-to-sql; enums; Share. I want to be able to map these properties to Entity Framework. In my experience, supporting "piecemeal conversion" for compat purposes is almost always more trouble than it's worth and should be avoided unless wholesale conversion is just too expensive (i. The way enums work in EF is that they are just cast to the underlying type and are treated as if they were one of the following integral types int64, int32, int16, byte, sbyte (note unsigned integral types are not supported by EDM and therefore enums with unsigned underlying type won't work and also in the database enum columns are just columns Map string column in Entity Framework to Enum (EF 6, not EF Core) 3. I'm working on small application with organizing hotel reservations in Entity Framework Core. 3? 4. Convert to Int Well, in the places where C# will normally resolve tostring for you, it normally takes an object. Ask Question Asked 11 years, 7 months ago. Think about if it was int you were trying to compare against, rather than an enum. Type)) or if that doesnt work in linq2sql, you could convert the types list to an int list and check that the int list contains the article type (which im guessing is an int in the db). In fact, enum changes don't even result in a model changed error, so you can change enums at will with no controls. 0. Anyway, I noticed that there is an attribute in System. This can be done, but it requires a little sacrifice on the database side. 5 - you can find more details here: Enum type not being mapped to DB table. 6. I tried setting this attribute, but it doesn't seem to affect anything. Using Where on Enum Values. Hence invalid input value for enum I am using Entity Framework Code with Code First development approach and a PostgreSQL Database. How to Use Enum Flags with EF 6. 5 and higher. Enum. 2 Enum in Entity Framework - how to create it. Relevant code: Entity: Value Conversions - to convert the enum to int when reading/writing to db; Data Seeding - to add the enum values in the db, in a migration; Here below a data model example: Entity Framework 5 Enum that is built from a db table. public enum FormBasis { [EnumMember(Value = "Order Based")] Order = 1, [EnumMember(Value = "Patient Based")] Patient = 2, [EnumMember(Value = "HCP Based")] HCP = 3 } My entity looks like this So, for your case (provided enum), if a record has two targets (Student and Professor), the final result will be 6. Transition EF Core 3. Which I suppose you don't. I am not sure if I understand you correctly. 9 Map a field to an enum in EntityFramework 5 Code First. My table looks like this. What we would like to do is create an entity to represent the values, preferably an enum to access the values and names in that table and make them available for use in our application. Here, for example though, you're asking it to compare a string to an enum. As you can see, the AddressType is stored as an int and the Some of those includes enum to string type, enum to int type, boolean to string or boolean to integer value. 1k 8 8 gold badges 112 112 silver badges 244 244 bronze badges. I thought about using a completely separate key for this but I don't think it actually wins me anything if I am seeding the data directly from the enum. I have the following. It's extra work, but we do so because we cast the entity to a dto object anyways, but might work for you. Let's say (the same example) I have these two entities in my model, one reference type (User) and another an enum (Roles). The above example, the enum is backed by an int value. OR use the Fluent way to specify the ignore (not shown in the code above) but below is a breadcrumb: Entity Framework Core 2. TypeAttributes. It also demonstrates how to use enums in a LINQ query. It would be different if you are now storing integer enum values in string columns, but that's peculiar. I'm only using strings because there is not yet enum support in Entity Framework Code First. Code This video and step-by-step walkthrough shows how to use enum types with the Entity Framework Designer. When do I use enum instead of a table like the following: When we have a predefined set of values allowed for a property/field, we usually use enumeration. How to map An alternative is to use a static class with string const fields instead of enums. Try explicitly saying the enum is an int public enum LimitMode : int and giving the members of the enum a value (Max = 0, ) – Alexander Derck. my_enum AS ENUM ('value1','value2','value3'); Entity Framework/Linq EXpression converting from string to int. How can I map an Enum using Entity Framework 4. You can use ef-enum-to-lookup by Tim Abell. You cannot seed values for an enum type to the database because enums are not entity types and thus do not go into the database in the first place. InvalidCastException: Unable to cast object of type 'System. Make sure you specify the enum type though if it is not an int like when using a byte, short, int, or a long. Generic method for setting string enum converter in EF Core for all entities. 8. NET Framework 4. Public, typeof(int)); // Define the The enums doesn't have the values of the statuses rows from the db because I don't want to create dependency of the data in the code (hard coded). Add a comment | 1 I have an enum with named fields using EnumMember. 3. enum Days { Sat, Sun, Mon, Tue, Wed, Thu, Fri }; You could also use Flagged Enums, Read more about enum here. is it possible in EF5 to generate an Enum with table values? 27. 30. 12 Microsoft Entity Framework Core 8 samples 13 EF Core log to file benefits 14 EF Core/NorthWind for Oracle 15 EF Core 8 Update Entity 16 EF Core To configure, in the DbContext, OnModelCreating setup an association The solution is a combination of @usr's answer, and an understanding of the version of EntityFramework I am using. Try . The Enumeration types An enumeration type (or enum type) is a value type defined by a set of Tagged with tutorial, csharp, database. cs. Rather, whenever a class has a MyEnum property, the database has an int column. Byte' to type 'System. Clone the Enum is supported in Entity Framework 6 onwards. e. EF Code First - convert string to int in query. . Entity Framework Mapping SQL Server tinyint to Int16. 0 and higher. Transition EF I've been using string properties on some of my model objects to represent enums. If your MyBaseClass is not mapped (is an abstract class), you can remove the first HasValue line describing the base discriminator. Entities { public enum ReasonOfVisit { NotSet = 0, For business reason = 1, For control = 2, For lefting package = 3, For leisure = 4 } public class Visitor { int to string in Entity Framework. 1 Fluent API? 0. This suggests that you could write a method which builds an expression tree from ternary expressions that can convert any possible value of your enum to its appropriate string. For example, consider an enum and entity type defined as: public int Id { get; set; } public EquineBeast This video and step-by-step walkthrough shows how to use enum types with Entity Framework Code First. 1 Entity Framework 5 Enum that is built from a db table. 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 { I am using Entity Framework 6, just release, and need to: 1 - Map a table column to an Enum; 2 - Map a lookup table (has two columns: Id and Name) to an Enum. 9. (above seen as [NotMapped]) . I've been using Linq2Sql for the last few years and got used to a few features, like having an int or tinyint field in the DB, that I redefine in the DBML file to be of enum type, so it's nice and convenient to run a SQL query directly comparing to the enum (see here for my question 3 years ago on the subject, and the answer there). Improve this question. e. Try the next code in your ApplicationDbContext:. I have implemented the AutoFixture. Entity Framework 6. Any Ideas on the ways that this can be accomplished using Entity Framework Core? c#; entity-framework-core; Share. But (AFAIR) byte type maps to a tinyint and not to bit type on the Sql Server side. Our first option was to model the enum as a separate table and use an unmapped The expression ResultType is 'BarEnum' but the required type is 'Edm. 15. DataAnnotations called EnumDataType. NET Framework 4 (and not the . – Hamid Pourjam. This walkthrough will use Model First to create a new Entity Framework Core ships with a predefined EnumToStringConverter class that can handle the enum-to-string conversion for us. [HouseSizes] ([Id] [INT] NOT NULL,[Name] We’ve looked at two different ways of handling enums in Entity Framework. Still getting invalid cast exception :/ Missing columns for enums in Entity Framework. public enum TT { Brown = 0, Green = 1 } Of course, you'll have to check the actual datas (mapped int) in your DB and update them to conform to the new order (can't change enum order without impact). You could even use the int representation of the enum as the primary key, but I don't see any good doing this. There were very confusing answers elsewhere but the one that seems the most obvious to me was the one below. EF5 does not create enum columns. What I wound up doing is changing the column type to int in the database then I went into the edmx and updated model from database, then I went and added a enum type and then changed the column type in the edmx designer to be of type of that enum. CREATE TABLE [dbo]. Enum as follows: public enum SafetyCategoryEnum : Int16 { High, Medium, Low } See my AutoMapper mapping below: [Solved]How can i retrieve gender as a string like "gender": "Male" in my jsonResult, I'am using EntityFramework Core 2. This Enum is supported in Entity Framework 6 onwards. jqau exgfz ktd jimrvg iey nkcv mtmxk egx xyi ymrlotq