Programmatically get a diff between two versions of a file in TFS

Solved. The problem was the reader. After I changed the last two lines to

var diff = Encoding.UTF8.GetString(stream.ToArray());

I got some diff at last.

I know you accepted your answer, and this was asked in 2012, but I recently had to do the same thing, but much prefer using a StreamReader vs .ToArray()

The answer is that you have to reset the MemoryStream before you start reading from it.

add this

stream.Position = 0;

right after you flush the writer