Question

I’m logging errors and sending myself the exception logs! Like the following code

    private void ExceptionForm_Load(object sender, EventArgs e)     {         Type exceptionType = _exception.GetType();          txtErrorMessage.Text = _exception.ToString();          if (exceptionType == typeof(Sybase.DataWindow.DbErrorException))         {              _exception = (Sybase.DataWindow.DbErrorException)_exception;              txtErrorMessage.Text += 'Exception SQL data:' +  exception;         }      } 

Now the problem is this. if (exceptionType == typeof(Sybase.DataWindow.DbErrorException)) then _exception has extra properies like the SqlSyntax that went wrong (e.g. Update something from table) The problem is how do I display that data. It isnt in my exception so it seems. exceptiontype = DbErrorException but I can’t seem to cast my _exception to it. Or is this bad practice? Or should I just delete everything and install the Exception Handling Application Block from MS?

Answer 1

The problem isn’t the cast – it’s that your _exception variable is (presumably) of type Exception. You need to declare a new variable of the right type. Also, do you have any reason for using GetType() instead of ‘as’ or ‘is’? What about derived exceptions? Try this:

private void ExceptionForm_Load(object sender, EventArgs e) {   DbErrorException specificException = _exception as DbErrorException;   if (specificException != null)   {      txtErrorMessage.Text += 'SqlSyntax=' + specificException.SqlSyntax;   } }