Entity Framework 4.4 SaveChanges Exclude Related Entity

Question

I'm using EntityFramework.dll version 4.4 with .NET 4.0. I have an entity that's contains a reference to another entity like the following:

[Table("Bar")]
public class Bar
{
  public string Id { get; set; }
  public Foo Foo { get; set; }
  [ForeignKey("Foo")]
  public string FooId {get; set; }
}

When I want to add a new "Bar" record to the database, EntityFramework tries to also add an instance of "Foo", but I don't want it to do this. Is there a way to tell EF to ignore the Foo entity when Bar is created? I do not want to set [NotMapped] on Foo because it does need to be mapped - it's just that I don't want it to save. So I'd like for the following to work:

public void CreateBar(Bar b)
{
   _barContext.Bars.Add(b);
   // This function doesn't exist, but I would like it to exist
   _barContext.Exclude("Foo");
   _barContext.SaveChanges();
}

Answer 1

您可以使用NotMapped属性，请参阅http://msdn.microsoft.com/zh-cn/library/system.componentmodel.dataannotations.schema.notmappedattribute(v=vs.110).aspx