.NET MissingMethodException occuring on one of thousands of end-user machines -- any insight?
- by Yoooder
This issue has me baffled, it's affecting a single user (to my knowledge) and hasn't been reproduced by us...
The user is receiving a MissingMethodException, our trace file indicates it's occuring after we create a new instance of a component, when we're calling an Initialize/Setup method in preparation to have it do work (InitializeWorkerByArgument in the example)
The Method specified by the error is an interface method, which a base class implements and classes derived from the base class can override as-needed
The user has the latest release of our application
All the provided code is shipped within a single assembly
Here's a very distilled version of the component:
class Widget : UserControl
{
public void DoSomething(string argument)
{
InitializeWorkerByArgument(argument);
this.Worker.DoWork();
}
private void InitializeWorkerByArgument(string argument)
{
switch (argument)
{
case "SomeArgument":
this.Worker = new SomeWidgetWorker();
break;
}
// The issue I'm tracking down would have occured during "new SomeWidgetWorker()"
// and would have resulted in a missing method exception stating that
// method "DoWork" could not be found.
this.Worker.DoWorkComplete += new EventHandler(Worker_DoWorkComplete);
}
private IWidgetWorker Worker
{
get;
set;
}
void Worker_DoWorkComplete(object sender, EventArgs e)
{
MessageBox.Show("All done");
}
}
interface IWidgetWorker
{
void DoWork();
event EventHandler DoWorkComplete;
}
abstract class BaseWorker : IWidgetWorker
{
virtual public void DoWork()
{
System.Threading.Thread.Sleep(1000);
RaiseDoWorkComplete(this, null);
}
internal void RaiseDoWorkComplete(object sender, EventArgs e)
{
if (DoWorkComplete != null)
{
DoWorkComplete(this, null);
}
}
public event EventHandler DoWorkComplete;
}
class SomeWidgetWorker : BaseWorker
{
public override void DoWork()
{
System.Threading.Thread.Sleep(2000);
RaiseDoWorkComplete(this, null);
}
}
