I have created a small program which runs under Windows and uses COM objects.
The part the handels access to the COM object is inluded into a try/catch
block. The catch block looks as follows:
catch(Exception ex)
{
MessageDialog md=new
MessageDialog(this,DialogFlags.Modal,MessageType.Error,ButtonsType.Ok,ex.Message);
md.Run();
md.Destroy();
}
If the COM object is not registered the first line within the catch blocks
throws an exception. This second exception is not handled and the application
crashes. It took me hours to find out the reason. The error message contains
the COM object's class ID included unto braces {}. The contructor of
MessageDialog assumes the message string (last parameter) is a format string
which typically includes braces which function as a placeholder for
parameters.. However, no parameters where specified. As a result, an exeption
of type FormatException is thrown.
This kind of error is very difficult to track down. I think there should be a
better way to design the MessageDialog class to prevent this problem.
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