Get types used inside a C# method body

Question

Is there a way to get all types used inside C# method?

For example,

public int foo(string str)
{
    Bar bar = new Bar();
    string x = \"test\";
           


        

Answer 1

This definitely cannot be done from reflection (GetMethod(), Expression Trees, etc.). As you mentioned, using EnvDTE's CodeModel is an option since you get line-by-line C# there, but using it outside Visual Studio (that is, processing an already existing function, not in your editor window) is nigh-impossible, IMHO.

But I can recommend Mono.Cecil, which can process CIL code line-by-line (inside a method), and you can use it on any method from any assembly you have reference to. Then, you can check every line if it is a variable declaration (like string x = "test", or a methodCall, and you can get the types involved in those lines.