How to read the source code of active document using DTE/DTE2 in visual studio project

Question

I am trying to generate an assembly file (Dll) from current active document in the editor.

Ex. I have 3 C# source files - file1.cs, file2.cs, file3.cs and if I currently opened the file2.cs in the editor. I need to build an assembly Dll only for a single file file2.dll using the Roslyn compiler API.

You generally can't do that. (what if the files depend on eachother? What references / project settings / build steps?) — SLaks, Sep 07 '16 at 19:09
Generally this will not work unless the class is completely self contained. — Paul Swetz, Sep 08 '16 at 14:17
thanks, if I can use Roslyn API - CSharpCompilation and link all the references this source uses while creating the compilation unit? — Hanif Zubair, Sep 09 '16 at 00:43

score 0 · Answer 1 · answered Sep 08 '16 at 03:24

You can get the current document text with the following code:

EnvDTE.TextDocument textDocument = (EnvDTE.TextDocument)DTE.ActiveDocument.Object("TextDocument");
EnvDTE.EditPoint editPoint = textDocument.StartPoint.CreateEditPoint();
string result = editPoint.GetText(textDocument.EndPoint);

score 0 · Answer 2 · answered Sep 08 '16 at 18:16

0

Ignoring the concerns about "that might not work" for a moment, rather than getting the text, get the actual syntax tree from the Roslyn API and then construct your compilation with that. You can either get it from the VisualStudioWorkspace or other places. That means you don't have to reparse the file yourself, which is potentially tricky if the user has #if directives and other stuff. You can also get the SourceText from the workspace API as well, which you can directly hand back to our parser if you do need to reparse, but that'll be a lot more efficient than reconstructing a string.

answered Sep 08 '16 at 18:16

Jason Malinowski

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thanks Jason, is there any example source on how to implement this? – Hanif Zubair Sep 09 '16 at 00:44
There's a few different ways to do it, depends upon what you're starting with. What are you trying to build? – Jason Malinowski Sep 09 '16 at 17:40
I have a requirement to compile the current source document using Roslyn API – Hanif Zubair Sep 11 '16 at 15:22

score 0 · Answer 3 · answered May 29 '21 at 11:25

DTE2 dte2 = Package.GetGlobalService(typeof(DTE)) as DTE2;
   
Document active = dte2.ActiveDocument;
TextDocument textDocument = (TextDocument)dte2.ActiveDocument.Object();

EditPoint endPoint = textDocument.EndPoint.CreateEditPoint();
string content = endPoint.GetLines(1, textDocument.EndPoint.Line + 1);

How to read the source code of active document using DTE/DTE2 in visual studio project

3 Answers3