如何使用流畅的API添加主键 - 实体框架EF 4.x代码优先

Question

我需要映射一些自动生成的类,我不想改变它们的显示(它是自动生成的!).

那么是否有可能使用实体框架的流畅API定义主键(在我的情况下为4.3)？由于NULL值,将属性处理为ComplexType会导致DbUpdateExcetion.向生成的类添加主键可能是一种解决方案,但不适合我,POCO必须保持不变.请帮助!谢谢.

目前我忽略了属性,因为......

ModelValidationException 
EntityType 'Attribute' has no key defined.  Define the key for this EntityType.
EntitySet 'Attributes' is based on type 'Attribute' that has no keys defined.

这是一个简短的示例代码:

public class Item
{
   public ID {set;get;}
   public Attribute[] Attributes {set;get;}
} 
public class Attribute
{
   public SomeComplexType misc1 {set; get;}
   public SomeComplexType misc2 {set; get;}
}

public class ItemDb : DbContext
{
    public ItemDb(string connection) : base(connection)  {}

    public DbSet<Item> Items { get; set; }

    protected override void OnModelCreating(DbModelBuilder builder)
    {
      // currently I am ignoring the Attributes 
        builder.Ignore<Attributes>();
    }
}

Answer 1

您可以使用HasKey方法.

builder.Entity<FooBar>().HasKey(...);