c# - AST walker doesn't seem to work fine -

i using roslyn , have created ast walker in order detect when nodes traversed.

the source trying parse following:

var source = string.format(@"     using system;     using system.collections;     using system.linq;     using system.text;      namespace helloworld       {{          class {0} : {1}          {{             static void main(string[] args)             {{                console.writeline(""hello, world!"");             }}          }}       }}", "myclass", "mybaseclass"); 

and walker:

namespace mystuff {     using system;     using microsoft.codeanalysis;     using microsoft.codeanalysis.csharp;     using microsoft.codeanalysis.csharp.syntax;      public class mywalker : csharpsyntaxwalker     {         public mywalker(syntaxnode node) :           base(syntaxwalkerdepth.structuredtrivia)         {             this.root = node;         }          public syntaxnode root { get; private set; }          public void start()         {             this.visit(this.root);         }          sealed public override void visitaccessordeclaration(accessordeclarationsyntax node)         {             this.dosomething(node, this.type.isinstanceoftype(node));         }          ...          sealed public override void visityieldstatement(yieldstatementsyntax node)         {             this.dosomething(node, this.type.isinstanceoftype(node));         }          // breakpoint in body of function!         private void dosomething(syntaxnode node)         {             ...         }            } } 

i overriding visit methods, alphabetically visitaccessordeclaration visityieldstatement. doing try stuff, not real applications, know quite nonsense.

visiting

i run it:

syntaxnode root = csharpsyntaxtree.parsetext(source).getroot(); 

and run walker:

var astwalker = new mywalker(this.root); astexecutor.start(); // next operation 

what happens? seta breakpoint on function dosomething , expect it lot of times. not happen. happens 1 node: visitcompilationunit. after control flow passes on on // next operation , that's it.

what missing? thanks

in overrides, need call base version of method overriding. allow stop walk. not calling base if trying visit specific nodes, can control it.