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As you can see in the source code, one of the ManipulateStrings arguments, myString, is passed with the ref keyword. When you have an argument that is passed to a method by reference, the called method is receiving a reference to the same memory location used by the caller. Therefore, if the method is modifying the content of that argument, it is modifying the content at this memory location and thus modifying the variable from the caller. In this case, anything that is done to the myString argument will modify the value of the variable in the calling code. The other argument is myPosition, and it is passed by value. When you have an argument that is passed by value, the method is receiving a copy of the variable from the calling code and thus can t modify the original value from the caller. Therefore, the content will get lost when the method ends and the execution flow returns to the caller.
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TO BEGIN STEPPING OUT OF THE MANIPULATESTRINGS METHOD
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1. Press Shift+F11 to step out of the ManipulateStrings method, or click the Step Out button. The application stops abruptly. What just happened is an unhandled exception. An unhandled exception happens whenever an error occurs that is not anticipated or handled
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explicitly by your application. In that case, the execution of your application is halted because there is no way the application can continue in that state without potentially corrupting the memory or opening security holes. One of the .NET runtime (CLR) principles is to make sure that neither ever happens. Therefore, the CLR crashes your application to prevent your application from continuing to execute in an unknown state. Even though the CLR is taking those precautions, which means it is less likely to have insecure code executing in .NET, it is still possible. To help you find the bug that raised the unhandled exception, Visual Studio includes another useful tool: the Exception Assistant. The assistant is helpful because, based on the context of the exception, it provides information that helps you debug, including error helpers such as the type of exception, troubleshooting tips, and corrective actions that can be applied through the Exception Assistant. Look at Figure 7-8 to see the information provided for the current exception.
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Figure 7-8 Exception Assistant
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When you look at the exception name, the troubleshooting tips, and the data visualizers, it should be apparent why an unhandled exception was raised. The exception name alone is self-explanatory: IndexOutOfRangeException. The first troubleshooting tip displayed asks you to make sure the maximum index on a list is less than the list size. Arrays in .NET are zerobased, which means that the first element starts at index 0. The length of the string received as the argument is 10.
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142 Microsoft Visual C# 2008 Express Edition: Build a Program Now!
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The intent of this method was to modify the last character of the string when the position in the array is equal to a position passed by value to the method. In this particular case, the position passed by value to the method is 1. Therefore, in the for loop, at the second character of that string, the if statement will return true, and then the index i will get the value of the string length. This means i is now equal to 10. When the application tries to modify the character at index 10, an exception is generated because index 10 is outside the range of the array. The array has 10 characters with indexes from 0 to 9. Figure 7-9 uses a new visualizer to look at the myTempCharArray content. When you move the mouse pointer over program elements, you ll sometimes see a magnifier. If you click the drop-down list, you will see a list of visualizers that display the information in a way that is meaningful to the data type you re seeing. For instance, if you re working with XML or HTML content, the XML or HTML visualizer allows you to see the content as if you were using Windows Internet Explorer or any other XML or HTML tool. You ll use one of the visualizers soon when you debug the ReadFile method.
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