There is no Key attribute in EF CTP 5

Question

According to the blog post here Data Annotations in the Entity Framework there should be an attribute for a column called "Key" which allows you to mark the primary key of an entity. However I cannot locate this in .Net 3.5 or .Net 4.0.

What have I missed? I've included the reference to EntityFramework.dll and I've checked all the attributes under System.ComponentModel.DataAnnotations but I cannot locate it.

I have set my project to .Net 4.0 full (not client profile).

Any ideas?

Answer 1

The KeyAttribute is .NET 4 only and it is located in the System.ComponentModel.DataAnnotations assembly so make sure you have referenced it.