Simple example of how to get an AST

I'm currently evaluating the editor for a project where I have to add C# scripting capabilities. While the editor functionality is great, I need to be able to get an parse and get an AST from a text file, not from the editor. I'd like to use the C# add-on parser to do this.

I've used ANTLR before and what I'm trying to acheive with an ANTLR generated parser would look like something like this:

//Initialize lexer
CSharpLexer lexer = new CSharpLexer(fileStream);
.
.
CSharpParser parser = new CSharpParser(lexer);

//If the text file contained a single function
parser.MethodBody()
Antlr.Collection.IAST treeRoot = parser.GetAST();
WalkTree(treeRoot);

Does anyone have a simple example of how to do this with the SyntaxEditor C# parser?