Entity framework enum as string. 1+ supports Value Conversions.

Entity framework enum as string There is a workaround by Alex James, but it's quite involved. Grade } into data select new DataSummary() { UserName = data. net Core List<enum> in May 2, 2022 · I have a Customer entity/table in Entity Framework Core setup with an enum property named Mode. Jul 7, 2022 · 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. I get this exception when reading data from DbContext: Requested value 'PointSync' was not found. I then started using LinqKit and Expressions to have reusable filters. Enum in EF has same limitations as enums in CLR - they are just named set of integer values. Let’s introduce the first enum: public enum Status { OPEN, REVIEW, APPROVED, REJECTED; } Next, let’s add it to the Article class and annotate it with @Enumerated(EnumType. 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. I used this video today to catch up with enums in Entity Framework. Jan 17, 2016 · I'm working on a side project where I use Entity Framework 6 for my data layer. The docs say: By default, any enum properties in your model will be mapped to database integers. HaveConversion<string>(); } and all properties of type Enum will be serialized as string, rather than numbers. public enum FormBasis { [EnumMember(Value = &quot;Order Based&quot;)] Order Jun 25, 2019 · C#のEnumは内部的にはintなので、Javaと違って値が文字列(string)となるEnumは言語の標準機能では使用することはできません。 また、エンティティクラス側でそのプロパティの型をEnumにする場合、文字列との変換をどのように行うのかを定義する必要があります。 Jan 28, 2013 · Here, for example though, you're asking it to compare a string to an enum. I have the following Enum public enum Status { Open, Closed } EF 4. Properties(typeof(Enum)) . The opinion of the community tho is that : enums are convenient and popular, so everyone uses them using enums as strings on the entity is the most convenient way of doing things using foreign keys pointing to another table is less convenient (and prolly less efficient cost-wise) but more secure Jul 30, 2014 · @Chris Hardie, I see that I included some code unintentionally. It also demonstrates how to use enums in a LINQ query. Where(doc => query. Items on p. Is this possible in Entity Framewor Enum is just an enumeration with names to represent each value, hence it saves as a number, because it is a number. ORDINAL) annotation on the enum field, JPA will use the Enum. EF for dynamic access and query compilation. Aug 14, 2020 · I am using Entity Framework Code with Code First development approach and a PostgreSQL Database. PRIOR TO EF CORE 8 (or if you want to manually control the serialization instead of using JSON) Dec 21, 2021 · First, string to enum conversions are already available. e. This option, unique to PostgreSQL, provides the best of both Apr 25, 2012 · 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 Jan 27, 2017 · Make the property an Enum and define that enum. With no effects. class ModelClass { public SomethingType Type {get; set;} } I am unable to work with enums in my model. One of my classes has a enum property. Nov 23, 2024 · public class StringToEnumConverter<TEnum> : Microsoft. Explicit enum to string conversions would make your code messy and you'd have to keep parsing values. Aug 26, 2020 · 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. Entity<MenuItemTag>() . You can use the built-in EnumToStringConverter<> to automatically convert an Enum to string, and vice versa. Id-- exactly the extra table you want to avoid. This issue has been logged in efcore github repo and here is the workaround for this now. This is not possible with Entity Framework at the moment; there are a few hacky solutions out there. Visual Studio 2012 targets . Jan 9, 2014 · The only difference between enum types with and without HasFlagAttribute is how they are written when using . Code. Where(it => it Jan 8, 2021 · Enum is a special class that has read-only variables and cannot be changed. DataAnnotations called EnumDataType. Entity Framework converts expressions to sql. Position). should be able to map it to a char property, and therefore your statement could be: Sep 11, 2012 · This is my first time using EF and I started with EF5. HasConversion<string>(); as a chain of invocations of MethodInfo. active = IsActive and p. ToString Not Working. 15. EF Core 2. Smaller Column Size Jan 13, 2014 · Map string column in Entity Framework to Enum (EF 6, not EF Core) 0. Jun 28, 2016 · I've been searching the internet how to map enum in ASP. Nov 13, 2021 · Using Enums in Entity Framework Where Clause. cs in the root of your project, although you can place it wherever you like so long as you know what namespace it is in. What I want to do, is have Entity Framework 5 automatically distinguish between DerivedOne and DerivedTwo, with a MyEnum value based discriminator. public enum Status { SomeStatusA = 1, SomeStatusB = 2, SomeStatusC = 3, } public class Position: EntityBase { public Status Status { get; set; } public string ReferenceCode { get; set; } public string Location { get; set; } public string Content { get; set; } } Jan 28, 2023 · 1 Using EF Core and Bogus 2 EF Core Handling Concurrency Conflicts 13 more parts 3 EF Core debugging part 1 4 Using Enum with EF Core 5 SQL-Server: Computed columns with Ef Core 6 EF Core string conversions 7 Insert/read SQL-Server images with EF Core, Dapper and SqlClient 8 EF Core 7: Json columns 9 EF Core order by string column name 10 Jul 8, 2021 · Some of those includes enum to string type, enum to int type, boolean to string or boolean to integer value. May 27, 2015 · MVC doesn't make use of the Display attribute on enums (or any framework I'm aware of). To continue taking your enums to the next level, see my other post: C# Enum Display Names With Spaces and Special Feb 26, 2014 · @Entity class User { @Id @GeneratedValue private long id; private Language lang; //Language is an Enum of all languages private Role role; //Role is an enum of user roles like admin, super-admin, etc } My questions are: 1) How should I design the database column to work with the enum types? Should I use varchar, or any other type? Sep 30, 2013 · So, I have an existing lookup table in my database that stores an ID column(int), a description/Name for the ID Value. In the database it will be entered as an enum, which is in essence a string with a list of allowed values. The entity: I have configured an EF Core 3. It's a great step by step demonstration. We can define a value conversion in the Configure method in ProjectConfiguration. Entity<TestObject>;(builder =&gt; { builder. 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. Use an existing enum type from a different namespace. This is because I don't like having enum columns in database without meaningful value. PostgreSQL and MySQL do have enums, and NpgSql does map PostgreSQL enums to C# enums, but even there scaffolding only adds the mappings. Although C# COULD call tostring(), its not correct for it to do so. Address, p. At first I was using IList<string> MyValues, but apparently EF6 will not create a database field of this type. You can have it backed by a string by using : SmartEnum<TestEnum, string>. Value2 represents DerivedTwo. If your entity-framework clone does not support Int32. There were very confusing answers elsewhere but the one that seems the most obvious to me was the one below. 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. GetValue(i) will return a string. Aug 14, 2017 · In Entity Framework, an enumeration can have the following underlying types: Byte, Int16, Int32, Int64 , or SByte. Marks, p. 5. 7. Anyway, I noticed that there is an attribute in System. I'm only using strings because there is not yet enum support in Entity Framework Code First. Instead, i prefer to do this: public enum Gender : byte { Male = 1, Female, Unknown } public class Person { public int PersonId { get; set; } public string LastName { get; set; } public string FirstName { get; set; } public byte Gender { get; set; } // this is the EF model property public Dec 4, 2011 · I've been using string properties on some of my model objects to represent enums. In this post, we will add a new column to an entity that is of an enum type, set the default value, and create the migration script. Check this article for confirmation:. Oct 24, 2018 · My understanding is that for enum values, the built in type converters can convert from the enum value to the string equivalent (EnumToStringConverter) or from the enum value to it's numerical representation (EnumToNumberConverter). I tried setting this attribute, but it doesn't seem to affect Jan 6, 2021 · If you want your enum to be a string follow the documentation here: How to make a Get method on this enums on Entity Framework? 1. EDIT: enum: public enum LimitMode { Max, Min, MaxAndMin, } Model: Dec 16, 2020 · The above example, the enum is backed by an int value. Entities { public enum ReasonOfVisit { NotSet = 0, For business reason = 1, For control = 2, For lefting package = 3, For leisure = 4 } public class Visitor { Jul 19, 2013 · The idea is to have number-based representation in the data base like short and create your enum with implicit numbers e. var test = await _context. And: "LINQ to Entities does not recognize the method 'System. The same goes for lookup tables. ORDINAL): Apr 15, 2022 · We need enums as strings stored in DB. 27 Mapping Enum from String. There is no construct in SQL that allows a constant value to be part of a foreign key. Plus this also makes it easier to know what that enum Dec 28, 2019 · public enum Type { TypeA, TypeB, TypeC } I have this using Fluent API and Entity Framework 3. If your column is char(1) or nchar(1) in SQL Server, E. TypesExclus. Id) . You can use the EF. I started by looking at some of the considerations you should make before confirming your decision to store enums as strings in an Azure SQL or SQL Server database. Nov 19, 2013 · Adding the lookup table is simple when using Entity Framework Migrations. NET 3 API. NET Framework 4 (and not the . EFCore enum to string value conversion not used in where Jun 1, 2016 · This is currently not possible. Now, let’s say there is a user entity which has a column – MembershipType. In other words, there will be no Categories table, so it makes no sense to seed values into that non-existent table. 5 by default. Name, p. Just before converting use AsEnumerable() Aug 14, 2014 · String. If you want these to be strings then all you should need to do is follow the naming conventions for keys and foreign keys:: EF Core 2. EF internally strips the information about enum type and is only using the underlying enum type (accounting for nullability). NET Framework 4 the enum properties were not discovered and added to the model since EF 4 which was part of . Demos. Min(x Dec 30, 2022 · Entity Framework Core does not support translating enum types to SQL. You need to create a custom Enum extension class: public static string Nov 27, 2024 · I have an entity model which has a property of an enum type, and the values from the database column are strings. Properties<Enum>(). documents = documents. Jan 8, 2024 · If we put the @Enumerated(EnumType. Convert an Existing Property to Enum Mar 7, 2016 · I don't believe there's a way to do what you want AND make it a foreign key. 0: builder. 0-beta1). SampleId Where p. NET 8 has now built-in support to store lists of primitive types in a column. Enum. 2 model to serialize enums as strings instead of integers. I tried string[] as you can see, but that didn't generate a field either. modelBuilder. GetDisplayName(). Mar 25, 2013 · But you want to store a separate list of ints for each MyObject. edmx. Min(x => x. EF Core will store string enums in non-nullable string columns (NVARCHAR(MAX) in SQL Server, TEXT in Postgres). I think Pragmateek provided some hints of how I can use a string to make it work. e. AzureTableStorage 7. Jun 23, 2012 · For example, I have a User entity: public class User { int Id { get; set; } string Name { get; set; } UserType UserType { get; set; } } And a UserType enum: public enum UserType { Member = 1, Moderator = 2, Administrator = 3 } I would like for database generation to create a table, something like: Nov 23, 2014 · In September 2018 I wrote a new post explaining how to store enums as ints or strings with Entity Framework Core. displayName; } // Entity Framework will only retrieve and set the display name. 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. Oct 1, 2016 · Map string column in Entity Framework to Enum (EF 6, not EF Core) 0. Jun 4, 2013 · Enums are not supported in Entity Framework. Further: in EF 5 there is enum support, I'm not sure what the sorting order is, I suspect the numeric value. Title = (byte)Enumerations. This walkthrough will use Code First to create a new database, but you can also use Code First to map to an existing database. TitleEnum. Aug 21, 2014 · Entity framework doesn't recognize my ToString method that converts the route object to specifix string. This column is supposed to hold an enum value – any one of Premium or Free. ToListAsync(); Oct 24, 2020 · I have a Person model with a Gender enum poperty which is stored as a string in the database. ToTab Mar 20, 2019 · This all works fine when just querying my entity from the DbContext. I need to store an enum in the database as string rather than integer. May 16, 2018 · In addition to @PaoloFulgoni, here is how you'd do it if you want a many-to-many relationship with enums i. Feb 16, 2022 · while trying to compare two values - an enum(by converting to string) and a string keyword which I get from a search form in . The database is not dedicated exclusively to my project. 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. You can try to convert the enum to an integer before performing the comparison. Type) . . 0. It supports implicit casts, etc. You can't compare the number 1 and a string. query = query. I can save enum property. Nov 11, 2021 · While looking for a solution to store all our enums as strings in the database, i came up with the following code. 2 with Asp. 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 } type EnumToStringConverter<'Enum (requires 'Enum : struct)> = class inherit StringEnumConverter<'Enum, string, 'Enum (requires 'Enum : struct and 'Enum : struct)> Public Class EnumToStringConverter(Of TEnum) Inherits ValueConverter(Of TEnum, String) Public Class EnumToStringConverter(Of TEnum) Inherits StringEnumConverter(Of TEnum, String, TEnum) Entity Framework can only see an enum value for what they technically are: an int. This enum is already defined in code: public enum StateEnum { Ok = 1, Fail = 2 } This is what Scaffold-DbContext gives me Mar 14, 2019 · [Solved]How can i retrieve gender as a string like "gender": "Male" in my jsonResult, I'am using EntityFramework Core 2. Dec 15, 2015 · With entity framework 5. Oct 13, 2024 · This is where Entity Framework Core (EF Core) Enum to String/Integer: Converting an enum to a string or integer for storage in the database. 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. HaveConversion<string?>(); My schema has the column defined as a null-able NVARCHAR(50) for instance and I can store a row with an enumeration value (which converts to string) and a #null value which leaves the column as the default #null. 1+ supports Value Conversions. Similarly the enumeration should be explicit with each value rather than relying on auto-increment. Define an attribute class which will contain the string value for enum. the class is Entity Framework 5 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 4. Asp. They are supported in Entity Framework staring from version 5. HasConversion<string>(); Which leads to the original problem. So something like this is a must. Entity&lt; May 27, 2020 · You could find all the model classes (assuming they share a namespace) and then iterate over all of their properties, filter to only properties with an enum type, and then call modelBuilder. I am using an ENUM class within my model. – Nov 19, 2018 · Enum item: public enum Title { Mr, Mrs, Miss, Chief } By default, Title. Contains("acc")). Sep 15, 2018 · A few years ago I wrote a post about saving enums to the database with Entity Framework. ToString() into. Nov 23, 2014 · I hit a problem where I wanted to use Entity Framework to save the text value of an enum to the database rather than its numeric value. public enum FileStatus { New = 1, Working = 2, Competed = 3 } The model - public class Nov 17, 2021 · The enumeration holding table PK column should not use auto-increment, but explicit IDs to match the Enum. Feb 4, 2020 · I also use entity framework code first. HasConversion<int>(); This converts the string coming in and saves it in the DB as an int. 2. Read more about enum support in EF code first here. Jan 11, 2024 · In this article, I documented a better way to convert enums to strings using Entity Framework Core. Oct 14, 2020 · Enum support was introduced in Entity Framework 5. Mar 18, 2013 · 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 My problem was to get the list of items from the Entity Framework object and create a formatted string (comma separated value) I created a property in my View Model which will hold the raw data from the repository and when populating that property, the LINQ query won't be a problem because you are simply querying what SQL understands. 1 that supports enums. I need to display the associated string in a grid. (It might not be exactly Enum. Entity<Element>() . To my knowledge, when mapping enum to enum it is not possible to explicitly cast the type when setting the value. Tags to convert back to an int id to send in the JSON response instead of the string enum name? I thought this code would do it: builder. use entity-framework to map int column to enum Dec 21, 2011 · You can achieve it but it will require a bit of work. NET MVC project using Entity Framework 6 (Code First and Fluent Api), the results of my search showed that this type of mapping is not trival as in we do in Java (Hibernate + JPA) . 0 onwards you can just use your enum : namespace MyProject. ToString(); } } } Apr 19, 2022 · I have an enum with named fields using EnumMember. May 7, 2015 · Could someone please explain how I can use Automapper to map from DB int value to a string, using Enums as the collection. 0 (with their respective EF versions), lots of different combinations but nothing seems to Oct 22, 2013 · 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. EntityFrameworkCore. When using EF Core, the easiest way to accomplish this goal is to use an enum as the type for the property. Enum is supported in Entity Framework 6 onwards. name of enum value) or should it be an integer value representing the enum value ? Let’s discuss various aspects that would be helpful in taking the decision. 1 D Aug 7, 2024 · configurationBuilder. 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. Create an enum outside of your . Read here about Primitive Collections. Jan 6, 2021 · The issue was caused by using the default value of Mecury (0). You can do this by referencing an external type. EmailId, q. Nov 2, 2023 · In this article, I have walked through how to store and retrieve enums as strings with Entity Framework Core. Map string column in Entity Framework to Enum (EF 6, not EF Core) Related questions. That's right. Nov 14, 2019 · Adding enums to the mix avails nothing here, as you either have to store them in the db as strings in order to get the name as you mentioned, or store the int value, which you then have to proceed to lookup. Think about if it was int you were trying to compare against, rather than an enum. It is a nicer solution than the one presented here. My problem is that during data reading i get invalid cast exception. class enum SomethingType { [Display(Name = "Type 1")] Type1, [Display(Name = "Type 2")] Type2 } and a model class that references to it. I hit a problem where I wanted to use Entity Framework to save the text value of an enum to the database rather than its numeric value. So how do you write a linq statement that returns a string instead of an int? I'd suggest for developers in similar positions that they see if the conversion is handled automatically by Entity Framework before following some of the answers on this page. So MySqlConnector will deserialize them as strings and MySqlDataReader. I created an Expression that accepts my entity and gives my enum as a result of some calculations on other properties of the entity. Entity Framework can't convert the methods you write in c# into sql. You can do it like this: public enum DwellingType { Apartment, Cottage, House } public DwellingType DwellingType { get; set; } // This wont be mapped in EF4 as it's an enum public virtual string DwellingTypeString // This will be mapped { get { return DwellingType. Grade } by new { q. HaveColumnType("nvarchar(128)"); } Dec 11, 2019 · EF Core 2. Jan 1, 2016 · This way you can use it with the modelbuilder in a clean way which is readable for others. Exception value is obviously 'exception' while Posthresql enum_logs_eventType contains 'Exception'. The value is casted to int. Id equals q. Feb 2, 2016 · I am actually using the Azure Storage Table provider for EF (EntityFramework. Is there a way to. Using an enum with Entity Framework. Mar 3, 2022 · I have this Linq to Entities (EF Core) query which looks like below. We have been using the data in this table for enumeration purposes. I avoid using enums when possible. If I were to use this using Entity Framework (code first) then the int values will be stored in the database. ComponentModel. I've ended up how to configure the DbContext: public class Subscription { public string Environment { get; set; } public string Name { get; set; } Feb 11, 2021 · EventType. Aug 10, 2016 · MySqlConnector now has support for ENUM columns in 0. Still version 6. String ToString()' method". ContactType. Entity<DemoEntity>() . For example if the query. 1 also allows you to map these to strings in the database with value converters. That maps to a separate list of ints for each MyObject. You'll see the exact statement that can't parse at run-time, the same way as described above. 1 introduced a new feature called value conversion:. I want to configure EF Core to serialize the Competence property as a string in Cosmos DB, but I am encountering issues with the proposed solutions I've tried so far. protected override void ConfigureConventions(ModelConfigurationBuilder builder) { builder. Storage. Property(p => p. Feb 1, 2017 · I might use this enumeration to establish a set of named values for customer credit ratings: Public Enum CreditStatusTypes Excellent Good Unacceptable End Enum. Jul 8, 2021 · Should it be a string (i. '0' or '1'), instead of the names of the enum as I would expect when calling ToString on the value ('Type1' or 'Type2'). I should be able to do this as, by convention, every MyEnum == MyEnum. net core 2. To use the new features like enums, spatial data types, and table-valued functions, you must target . So the value of the enum will be converted to string when saved in the database. Internal. Entity<MyEntity>(). , works well with EF, and you'll be able to "list" enums as needed. Property(tag => tag. 1. HaveConversion<string>() . Apr 15, 2010 · Enums convert from strings and back pretty easily: Hopefully the entity framework will someday support a combination of these answers to offer the C# enum strong Dec 29, 2013 · Based on your response to my comment, here is my answer: EF has fully supported using enums to map to database fields since EF 5, but will only do it for int values. Any(type => (int)type != (int)doc. g. TypeDocument)); Apr 21, 2021 · The enums are stored as strings in the database, and they have slightly different members (but they have 1:1 mapping) i. Probably the simplest fix is to use zero (first enum value) as the default. 0, 5. 5 which is an in-place update) installed. I want to be able to map these properties to Entity Framework. ToString() (and maybe how they are parsed when using Enum. The test entity I had: Jan 4, 2018 · public string Name { get; set; } you will get an nvarchar(max) column. I'am having trouble in enum, but in this exa Oct 3, 2023 · Both the User entity and the AuditStandardUserInfo entity have a Competence property of type AuditCompetence (an enum). Value1 represents DerivedOne, and MyEnum == MyEnum. 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. Define an extension method which will return back the value from the attribute. public string DisplayName { get { return this. Posthresql enum values are case-sensitive. Aug 30, 2016 · Unfortunately, this is one of the many shortfalls of Entity Framework. With that enumeration defined, I can use it to declare a property in an Entity Framework entity class, like this: Feb 11, 2015 · Map string column in Entity Framework to Enum (EF 6, not EF Core) 8. There are multiple reasons why you shouldn't just shove them all in a string, but the two most clear ones (IMO) are that it makes it impossible to query for those MyObjects for which Number contains (for example) 10, and it Feb 22, 2021 · The line causing this exception is where I am comparing the search text with value of enum (r. I've tried to register my enum in Npgsql (as it's pointed in npgsql documentation). So when I tried to fix this issue, I ended up here. Running dotnet ef migrations add Init will produce the following migration: migrationBuilder . GetName() to get the enum name as a string in code. My Oct 6, 2009 · This question is a bit old, but let me point you to a more recent material since today we have a newer version of Entity Framework: Video: Entity Framework 5 Enums and Moving Solution from EF 4. In this case, reordering the enum to be: Aug 3, 2022 · I have configured various entities in my DbContext class to convert the enum value to a string when saving to the database eg. Full list of built-in converters can be found here in the documentation. You can simply replace your properties definition as follows: public EventType EventType { get; set; } public EventTopic EventTopic { get; set; } Feb 10, 2022 · We can fix this by telling Entity Framework Core how to convert the object to and from the database using value conversions introduced into Entity Framework Core in version 2. Mar 23, 2015 · We add a setter because Entity Framework is only going to bring back the string display name and we need to map to the underlying value field to get the proper enum. LocationId, q. Full source code here. On retrieval the value is parsed to your enum type. Mar 12, 2021 · How can I get my database converter for MenuItem. 0 and 6. Compare is not in the list of functions supported by entity framework (see Supported Function List) This means that when you perform this query entity framework will retrieve the whole data set required to execute this compare and perform the compare locally. GetStringValue(this Enum value) will return attribute value. Contains(searchBy)) How can i compare display name of enum to the Search string IF someone is searching for text Resolved , i have to fetch all records of Status Resolved from db Apr 7, 2016 · I have an issue receiving the following error: Conversion failed when converting the nvarchar value 'HolidayRequest' to data type int. It worked fine but felt a bit hacky. Tried using 3. Where(x => ((string) (object)x. Oct 14, 2020 · This video and step-by-step walkthrough shows how to use enum types with Entity Framework Code First. Parse, you'll have to select the string as a string. Position) . Parse. 0. I'll try to explain myself with code since words are failing me. Convert Enum From String To Int In DB Then Back To String - Entity Framework Core 3. Mar 27, 2022 · When dealing with databases, there are times when you want a column to only allow certain values. I used reverse engineering system to start a code first from database at beginning. When scaffolding a migration, the CarBodyStyle field (which is an enum) is now recognized by entity framework: You need to disable code generation for your enum. Mr; Jun 13, 2017 · To convert a string to an int32 use Int32. Mar 29, 2015 · Entity Framework is supporting enums directly since version 5. F. Now the queries cannot be evaluated on the server. This will be very slow. Value converters allow property values to be converted when reading from or writing to the database. I’ve reused my old example on creating a database and updated Entity Framework to 6. This works out quite well. You can use other constructs like a computed column, CHECK constraint or triggers to ensure that the underlying data data is "constant" but the foreign key has to reference table columns. The code below demonstrates the issue. Oct 28, 2015 · Enum: public enum MyEnum { value1, value2, value3 } Unfortunately, when I try to get something from database via entity framework I receive this kind of error: System. Search Aug 7, 2012 · It should be "The as operator must be used with a reference type or nullable type", because you can't use as with value types, like the enum. For example, I found it handles the conversion between a string and a decimal and back again with no help from me - the migration that Add-Migration generated works fine. NET Framework 4 did not support enums and the application would not work on a machine that has only . Mr still has value 0. Property(e => e. If you need to specify a length, say 100 chars then you would specify the column in code: [MaxLength(50)] public string Name { get; set; } If you need to specify varchar rather than nvarchar you would use this: Feb 23, 2023 · We’ve looked at two different ways of handling enums in Entity Framework. Example. You can either create an entity (which will be saved to a different table) or do some string processing to save your list as a string and populate the list after the entity is materialized. 3 by Julie Lerman. Some linq-to-sql providers don't support Int2. By default, any enum properties in your model will be mapped to database integers. MySQL Server stores ENUM columns as integers but sends them to/from clients as strings. [StringLength(1)] public string status { get; set; } What you need to understand is that everything that should be an enum in a good database design is a string in my database. If you have 256 items or lower in the enum, you could try: public enum Title : byte { Mr = 0, Mrs = 1, Miss = 2, Chief = 3 } Title. Samples join q in db. MyEnum). NET Framework 4. ToString(); } set { DwellingType Oct 2, 2013 · The clr cant imagine casting an int to a string and Entity framework cant figure out what SQL snippet to translate . Id = GivenId group new { p. Apr 10, 2014 · Does anyone know how to access the "Display Name" data annotation of enum types? I have an enum type with display names. public enum Gender : short { NotSet = 0, MALE = 1, FEMALE = 2 } and also add the attribute [EnumDataType(typeof(short))] to the field of your entity. I found an article that gives an idea of how to solve the problem, but do not know if there is another way. Hence invalid input value for enum "enum_logs_eventType": "exception". var query = (from p in db. 5. I want to make a query to filter the data by a substring of the gender. you want many user roles or wine variants and work with enums moreover, you can't store it as a flag because you need to know about the roles/privileges without source code(on db side). I started by covering the old way of configuring the conversion and highlighted some of its limitations. Nov 21, 2018 · 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. Entity Framework 5 Enum that is built from a db table. UPDATE FOR EF CORE 8. ValueConversion. 2 project. Apr 20, 2011 · 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). Status. Considering that your database uses a string, I would suggest that you do some "indirect Oct 13, 2014 · How do I concatenate strings in Entity Framework 4 I have a data from a column and I want to save as a string a comma separated string like "value1, value2, value3" Is there a method or an operator do do this in EF4? Example: lets say that I have two columns Fruit and Farms with the following values: Apples; Bananas ; Strawberries; If I do like Oct 16, 2020 · Updates to the enum string names are successfully applied to the database through migrations, although of course you'll want to be careful changing the meaning of the values after they are already referenced by other entities. Name, Grade = data. StringEnumConverter<string,TEnum,TEnum> where TEnum : struct Feb 11, 2024 · The problem with this is that if I try adding a new entity in the database, the value stored in the Type column is the string representation of the values of the enum (i. Just add [Column] attribute to your enum field and specify TypeName as nvarchar (for SQL) or varchar (for postgres). cs in the Infrastructure project. Enum Type Mapping. Our first option was to model the enum as a separate table and use an unmapped property to cast it to an enum, and our second option was to use a value conversion to translate the enum value into something that can be stored directly in the database. – Feb 1, 2016 · The foreign key in the dependent needs to link (edit - usually links) to the primary key of the principal. No lookup table is stored nor the string names of the enum values, which makes it difficult to read the database data directly. Parse). Handling enum changes in Entity Framework 5. InvalidCastException: Can't cast database type my_enum to Int32. The enum property needs to be casted into object and then to string. In the ModelBuilder, I have set so that it is saved as string in the database: modelBuilder. However, the Npgsql provider also allows you to map your CLR enums to database enum types. . E. The table and the enumeration should be documented to refer their mutual dependency. Entity Framework does not support collections of primitive types. Property method to sort the queryable by the property names or even shadow properties. Entity Framework 5 Enum Naming. Encrypting Data: Dec 4, 2018 · 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. 1. We have Dec 16, 2014 · public enum Currency { EUR = 1, USD = 2, GBP = 3 } Let's say I have an enum as shown above. HasConversion<int>() . Mr should have the default value 0, Mrs has value 1, same to the orthers. Enum support was introduced in Entity Framework 5. I'm on my phone now so I'm just hazarding a quick guess. This happens when the db value doesn't exist in the Enum(ConfigurationType). Grade), Email = data. Here's the relevant part of my code: protected override void ConfigureConventions(ModelConfigurationBuilder configurationBuilder) { // Instead of numeric conversion that EFcore uses by default configurationBuilder. Apr 6, 2013 · Sometimes it can be desirable to map the string value and not the int value of the enum. Watch the Video Jul 8, 2020 · In the entity class that has your enum property, Status, create another property that gets string value of that enum: public enum Status { None, Ready, InProcess, NotReady } public class Process { public int Id { get; set; } public Status Status { get; set; } public string GetStatus { get { return Status. Using a enum with flag in an Entity Framework query. For e. 5 How to map int into enum with EF May 22, 2014 · I have an entity called Comment, which has an enum property of type CommentType:. The EF enum type definitions live in conceptual layer. I have an inheritance structure within Entity Framework. You'll need to use strings on the database side (nvarchar), and use Enum. In Entity Framework, an enumeration can have the following underlying types: Byte, Int16, Int32, Int64, or SByte. Does EF7 support enum properties ? How can i configure it with fluent api ? Thanks. GetName(). Jan 5, 2013 · As per your comments - since you targeted . The values can be accessed through dot operator. How can I instruct Scaffold-DbContext that a certain field in a certain table should generate code to use an Enum instead of just an int? This is how you used to do it in regular EF: Map Enum to Entity Properties. 3. What DOES work in this situation however is to leave the EF type definition for that field as a byte and when you are setting the value from the enumerations cast the enum value to the appropriate type: td. 0 onwards. It was able to save the enum as a string to the database and when reading from the database it was able to take that string and populate the enum correctly. ValueGeneratedNever(); Since the underlying database column type is string, association value converter is the correct mapping (by default EF Core maps enums to int). ordinal() value when persisting a given entity in the database. Aug 12, 2015 · For those who are looking for a solution in EF Core: There is a set of functions available in Microsoft. qxdnp ytq qqkvpb wuw rvqbyq xplpicvxb kcebg cjntcr jsrcd gorbwi