How to get runtime error line number in CodeDom?

Question

For example, the code below can complile ok, but throw an exception at runtime. My question is, how to get the runtime error line number ? Thanks.

using System;
using System.Collections.Generic;
using System.Text;

namespace mytempNamespace {
    public class mytempClass : {

        public void show() {

            String msg=null;
            String msgNew=msg.Substring(3);
        }

    }

}

When i compile , the result is ok

CodeDomProvider compiler = CSharpCodeProvider.CreateProvider("CSharp");
CompilerResults compilerResults = compiler.CompileAssemblyFromSource(parms, myClassCode);
Assembly assembly = compilerResults.CompiledAssembly;

When i invokde the method "show", the assembly throw an exception. How can i get runtime error line number in CodeDom?

Answer 1

Use StackTrace to extract an exception's file, line, and column information.

StackTrace stackTrace = new StackTrace(exception, true);
if (stackTrace.FrameCount > 0)
{
    StackFrame frame = stackTrace.GetFrame(0);
    int lineNumber = frame.GetFileLineNumber();
    int columnNumber = frame.GetFileColumnNumber();
    string fileName = frame.GetFileName();
    string methodName = frame.GetMethod().Name;
    // do stuff
}

You'll need to compile your code with CompilerParameters set up to output debugging information:

CompilerParameters parms = new CompilerParameters()
{
    GenerateInMemory = false,
    IncludeDebugInformation = true,
    OutputAssembly = myOutputAssembly,
    // other params
};
CodeDomProvider compiler = CSharpCodeProvider.CreateProvider("CSharp");
CompilerResults compilerResults = compiler.CompileAssemblyFromSource(parms, myClassCode);
Assembly assembly = compilerResults.CompiledAssembly;

Hope that helps!