CODEWITHSUNDEEP
c#entity-frameworkdata-annotations
lucacelenza
lucacelenza

Reputation: 1369

Entity Framework 6 Add Data Annotations on referenced class

Just wondering if it was possible to add Data Annotations to a class referenced from a class library which has no reference on EntityFramework.

For example Project.Data.Entities library

public class User {
    public long Id { get; set; }
    public string UserName { get; set; }
}

Project.Data.Repositories.EntityFramework references Project.Data.Entities library. How can I add the Data Annotations regarding Key properties, Column names, Table names, etc.?

Upvotes: 1

Views: 738

Answers (1)

bubi
bubi

Reputation: 6501

There are fluent APIs for this purpose.

EDIT

About your mapping you have to override OnModelCreating

public class TestContext : DbContext
{
    public DbSet<User> Users { get; set; }

    protected override void OnModelCreating(DbModelBuilder modelBuilder)
    {

        modelBuilder.Entity<User>()
            .ToTable("user")
            .HasKey(_ => _.Id);

        modelBuilder.Entity<User>()
            .Property(_ => _.Id).HasColumnName("id");

        modelBuilder.Entity<User>()
            .Property(_ => _.UserName).HasColumnName("username"); // Add also HasMaxLength here
    }
}

(if your database already exists and it's not created by EF on your model you need to disable also migrations)

EDIT

If you installed SQL Server with a CI codepage, column name casing is not important. So you need only to specify HasMaxLength

Upvotes: 2

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