Everything I find through Google refers to Code First so I'm wondering what the Key
attribute is actually doing in regards to a Database First design? I'm mainly curious because a lot of the entities contain composite keys so I've been adding the Key
annotation to the respective properties, but is this really necessary? And if so, what do I gain from it?
What does the `Key` Data Annotation do in database first?
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If you're using the database-first workflow (i.e. you have an .edmx file in your solution). Then the
Key
attribute will have no effect.However, if you're using the code-first workflow to map to an existing database, the
Key
attribute tells code first that that property is part of the entity's primary key.For more info on the different workflows see this video: Visual Studio Toolbox: Entity Framework Part 1