What causes a TypeLoadException on Migrate.exe for EF6?

Question

I\'m trying to run EF\'s migrate.exe from the command line as part of our build process. This is my actual command:

migrate.exe Hydrogen.Data.dll /startupCon         


        

Answer 1

I just ran into this today. This can happen when you used the wrong sets of DLL when you run migrate.exe.

In my case, I used the .Net 4.5 version in migrate.exe but compiled my project using .Net 4.0's version.

After changing the dlls the problem went away.