Are there any open source algorithms in c# that solve the problem of creating a difference between two text files?
It would be super cool if it had some way of highlighting what exact areas where changed in the text document also.
There's also a c# port of Google's (Neil Fraser) diff, match and patch.
There is Menees Diff which will provide you with a C# diff implementation. The source code is included. I've used it in the past with good success wrapping it in my own implemenation.
How about this one? : DIFFPLEX
Check out diff. Here it is in the gnu project (open source, of course), and many more links to implementations are found in the wikipedia article. A comparison of different such programs is found here.
check this link "good line by line Diff Algorithm " http://www.codeproject.com/KB/recipes/diffengine.aspx
来源：https://stackoverflow.com/questions/65199/c-sharp-compare-algorithms