c# - Get Method name that threw exception

Question

I know. A similar question has already asked.

• How to get the name of the method that caused the exception

but I haven't got the exact solution from that.

I have a button click event in which I have a method FillCombo().

Button Click event

private void button1_Click(object sender, EventArgs e)
{
      try
      {
          cmbTemplates.Items.Clear();
          lstFiles.Clear();
          FillCombo();                
      }
      catch (Exception ex)
      {
           MethodBase site = ex.TargetSite;
           Log(ex.ToString(), site == null ? null : site.Name);                
      }
}

When I debugged, I found that the exception occurs from FillCombo() method. After that I get the value of site.Name as WinIOError instead of FillCombo.

I tried another method GetExecutingMethodName() which was answered by Chris Gessler in How to get the name of the method that caused the exception question. So I tried sending the name of method that caused exception using GetExecutingMethodName() method

Log(ex.ToString(), GetExecutingMethodName());

But I got the result as System.Windows.Forms.Control.OnClick instead of FillCombo.

How do I get the actual name of method that caused exception?

Answer 1

.net supports getting the stack trace information from an exception. You could filter out the method (and its name) by examining the first frame (origin).

new StackTrace(ex).GetFrame(0).GetMethod().Name

This would probably give you exactly the same as the targetsite (the win io), but you can examine the stacktrace for the first user code, or the first frame in your type, or whichever your needs.

For example, getting the name of the culprit thrower in your current assembly:

var s = new StackTrace(ex);
var thisasm = Assembly.GetExecutingAssembly();                
var methodname = s.GetFrames().Select(f => f.GetMethod()).First(m => m.Module.Assembly == thisasm).Name;