EntityFramework 5 - Getting value cannot be null parameter name: font error while using the designer

问题

I'm getting a strange error while using EF 5 using a Database First approach on the designer. The error is saying 'value cannot be null parameter name: font'. I also get a big red X over the design area. I'm not exactly sure how the designer generated this error, and to this point, I've only used the designer to create my edmx.

Thoughts? This is with VS 2012 RTM version.

回答1:

I was able to resolve the same error by simply restarting Visual Studio.

回答2:

I was able to fix this by repairing the Entity Framework Designer for Visual Studio 2012 (Control Panel -> Uninstall a program etc..)

来源：https://stackoverflow.com/questions/12378670/entityframework-5-getting-value-cannot-be-null-parameter-name-font-error-whil