Outputting line numbers

Question

Is there a way, in VB.NET, to output the current line number in the source code? For example:

Try
    ' The following line will purposly cause an error
    Dim BigNum As Int64
    Dim LittleNum As Int16 = CShort(BigNum)
Catch ex As Exception
    Dim LineNumber As Integer = <linenumber> ' How do I do this?
    MessageBox.Show("Error in source code. Line: " + LineNumber)
End Try

Is there any way to fill the LineNumber variable in the example above with the actual line number in the source code that caused the error?

Answer 1

The line number will be in the Exception's stack trace already. I think it even shows in a simple ex.ToString.

Answer 2

This should do the job:

Dim stackTrace = New System.Diagnostics.StackTrace(ex)
Dim stackFrame = stackTrace.GetFrame(stackTrace.FrameCount - 1)
Dim lineNumber = stackFrame.GetFileLineNumber()

Note that GetFrame(stackTrace.FrameCount - 1)) gets the first frame pushed onto the stack. In this case, this is the frame containing the current try-catch block, which is what you want. See the MSDN docs for more info.)