Why does Git think my cs file is binary?

I have just one cs file in my repository which Git seems to think is binary. (In git gui, it just say开发者_StackOverflows "binary files differ".)

How can I indicate to Git that my cs file is a text file?

You could try and set your cs files as text in a .gitattributes file.

*.vmc diff

(as described in the .gitattributes man page)
or try to diff them as text (git diff --text)

But if your .cs files are UTF-8 or UTF-16, this can be problematic, unless you set your diff to use an external tool able to handle those encoding.