RE: Strange behavior with dynamic code compilation and VS.NET debu

Tech-Archive recommends: Repair Windows Errors & Optimize Windows Performance

Mike,
Sorry to have been terse before. Ben Day suggested I take a look at this for
you.

I think someone else suggested that it was optimization related; I noticed
that the you'd turned off debugging in the generated assembly and noticed
that the results changed considerably.

Wanted to make you at least aware of that, since it did generate all the
exception information that way.

BTW--I find it easier to debug CodeDom related problems by having the
assembly written to disk and then executing it, so you can run it standalone
if appropriate.

Hope this helps.
Regards,
RHS

"Mike Miller" wrote:

> So the behavior is suppose to be different??? This doesn't make any sense -
> so when I compile with debugging information I get different behavior then
> when I compile without it? Isn't optimization a change in performance, not
> behavior? Thanks for the response, I guess what I am getting at is how does
> one troubleshoot optimized code if when you debug it the problem disappears?
> Maybe we should go back to using lots of write lines instead of the debugger
> ;)
>
>
> "Richard Hale Shaw (C# MVP)" wrote:
>
> > Try changing the following line (change "false" to "true"):
> >
> > compilerParameters.IncludeDebugInformation = true;
> >
> > And you'll get the usual exception information when the program aborts.
> > Regards,
> > RHS
> >
> >
> > "Mike Miller" wrote:
> >
> > > When I run the following code I would suspect a null reference exception to
> > > be thrown:
> > >
> > > param1 = null;
> > > int x = param1.Length;
> > >
> > > However, when I compile this code dynamically into a class and method a null
> > > reference exception is ONLY thrown if the debugger is attached???? Otherwise
> > > no exception is thrown. Can someone please explain this? I included the
> > > code below - create a console application and overwrite the existing class
> > > with the code below.
> > >
> > > CODE TO REPRODUCE:
> > >
> > > using System;
> > > using System.CodeDom.Compiler;
> > > using System.Reflection;
> > > using Microsoft.CSharp;
> > >
> > >
> > > namespace ConsoleApplication1
> > > {
> > > class Program
> > > {
> > > static void Main(string[] args)
> > > {
> > > Assembly a = CreateAssembly();
> > > object o = a.CreateInstance("ConsoleApplication1.TestClass");
> > > MethodInfo info = o.GetType().GetMethod("RunMe");
> > > info.Invoke(o, new object[] { null });
> > > }
> > >
> > > private static Assembly CreateAssembly()
> > > {
> > > string src = @"
> > > namespace ConsoleApplication1
> > > {
> > > using System;
> > >
> > > public class TestClass
> > > {
> > > public virtual void RunMe(string param1)
> > > {
> > > int x = param1.Length;
> > > }
> > > }
> > > }";
> > >
> > > CodeDomProvider provider = new CSharpCodeProvider();
> > > CompilerParameters compilerParameters = new CompilerParameters();
> > > compilerParameters.GenerateInMemory = true;
> > > compilerParameters.IncludeDebugInformation = false;
> > > compilerParameters.GenerateExecutable = false;
> > >
> > > CompilerResults results =
> > > provider.CompileAssemblyFromSource(compilerParameters,
> > > src);
> > >
> > > return results.CompiledAssembly;
> > > }
> > > }
> > > }
.

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