Entity Framework modeling with .NET4, Data Annotat

问题:

I am trying to use Entity Framework on my web site. I followed tutorials and Visual Studio (2010) does not complain. However, when I add a ForeignKey data annotation, I get an error when I run on the web site that the Namespace does not exist. CS0246: The type or namespace name 'ForeignKey' could not be found (are you missing a using directive or an assembly reference?)

After doing some searching, it appears that the ForeignKey data annotation does not exist in .NET 4.

If that is the case, is there a way to add at foreign key to the model in .NET 4?

回答1:

Correct, System.ComponentModel.DataAnnotations.Schema is part of .NET 4.5.

Have you instead looked at the Fluent API?

Here's a video for VS 2010 specifically. http://msdn.microsoft.com/en-ca/data/gg194009.aspx