AN OVERVIEW OF .NET ERROR HANDLING in Font

Generation PDF 417 in Font AN OVERVIEW OF .NET ERROR HANDLING

CHAPTER 4 AN OVERVIEW OF .NET ERROR HANDLING
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Note The terms parameters and arguments are often interchanged in normal conversation. For the
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sake of clarity, we will use the formal definition of an argument as being the actual value passed into the method s parameter.
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Whenever you create a method with parameters, you need to pass in arguments to use them. So, in order to call the version of RunTest() with one parameter, you would write code like this: VB .NET RunTest(5) 'Or maybe like this: Dim x as int16 = 5 RunTest(x) C# RunTest(5); //Or maybe like this: int16 x = 5; RunTest(x); In the first sample, the 5 is the argument that will be passed into the Parm1 parameter defined earlier. In the second example, x is used as the argument it and would be passed into Parm1. In either case, they are the values that we wish to pass over to a method for processing. Now look at that error in the Error List window again (see Figure 4-2); Table 4-1 breaks it down for you.
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Table 4-1. A Translation of the Error Message
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Overload resolution failed because no accessible 'Show' accepts this number of arguments.
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Translation
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Many versions of the function. Could not find a matching one. There may be a hidden one, but you cannot get to that version from here. The name of the method. The number of arguments it thinks you are trying to pass into the method.
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CHAPTER 4 AN OVERVIEW OF .NET ERROR HANDLING
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As you can see, errors like these can be tricky to read if you are not familiar with the terms used, but can make perfect sense if you know the basic concepts of OOP. As we said, you will look at these concepts in more detail in 6.
Working with Runtime Errors
Runtime errors are the ones that happen as the program, well, runs. When the code was typed out, and then later compiled, everything looked fine. It was only when the program was running that a problem occurred. While syntax errors are usually caught by developers (this would be you when you are building you own testing application), runtime errors sometimes slip past them. As a tester, you no doubt find ways of breaking what the developer thought was working. Seeing how the application will respond to invalid data and unusual responses is vital to good testing. One classic example of a runtime error is where you divide a number by zero and the computer does not know how to handle it. The code may look something like this: VB .NET Dim Mileage, Distance, Gallons As Decimal 'Add code to set these values from the UI Mileage = Distance / Gallons C# Decimal Mileage, Distance, Gallons //Add code to set these values from the UI Mileage = Distance / Gallons Of course, when the developer tested the code with correct values, it would have worked fine. The Divide by Zero error only shows up if a 0 value is entered into the Gallons variable. A good tester will find an error like this pretty quickly using common testing techniques. Although testers do not always have access to the code directly, you do you have more options. For example, when you are White Box testing and can see the code, you can use the Visual Studio debugging tools to locate the real problem and give a more detailed description in your bug reports. If you are developing your own testware, then you can fix these types of errors by finding the boundaries of invalid responses and providing an appropriate error message to the user.
Working with Logic Errors
With logic errors, you test the application and never see an error message or disruptive behavior. However, you may find that the data being returned, or the process being completed, is invalid. Traditionally, these can be the hardest problems for a tester to track down. Even the developer that wrote the code can be puzzled when it does not work as intended. Once again, if you have access to the code, the debugging tools in Visual Studio can be very handy for these types of errors. You can set breakpoints, and then step through the code line-by-line evaluating the expressions and variables to determine where the problem lies.
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