Chapter 13 overloaded WriteErrorLog(string msg)

scolty · May 17th, 2011, 01:53 PM

Good evening,

Ive just read the section on p348. You state that if clsErrorLog is already instantiated and the user wants to write another error message to the file then the overloaded WriteErrorLog method is called.

Ive changed the boolean from False to True in the original WriteErrorLog method and then i have selected different radio buttons and clicked the Throw button but each time i single step through i cant get it to execute the overloaded method.

Im basically having issues understanding how the compiler knows that its suppose to call the overloaded method.

if you could clarify that i would appreciate it.

Thanks in advance.

DrPurdum · May 17th, 2011, 09:23 PM

The reason you can't get the parametized version of WriteErrorLog() to fire is because it's not called anywhere in that code. However, if you look near the bottom of the main form, you'll find:

Code:

finally
{
clsErrorLog myErrLog = newclsErrorLog(err);
myErrLog.PathName = Application.StartupPath;
myErrLog.WriteErrorLog();
txtErrorMsgs.Text = myErrLog.ReadErrorLog();
}

To call the parametized version, change the fifth line to:

myErrLog.WriteErrorLog(err);

Now, because the WriteErrorLog() method has a parameter being passed to it, the compiler knows to call the second version of the method. Single step through it and you will see how it works. The second version allows you more flexibility to pass in to the error log file some other kind of message you might wish to store.

scolty · May 18th, 2011, 03:56 AM

Aye ok, i must have misunderstood what you had written as i was under the impression that the overloaded method was being called yet the only call i could find was for the non-overloaded method.

Thanks again