Debugging in .NET

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Tracing provides you with a snapshot of the steps your code has taken after the code has run. At times, however, you d like to monitor your code while it is running. What you want is more of a CAT scan than an autopsy. The code equivalent of a CAT scan is a symbolic debugger. When you run your code in the debugger, you can watch your code work, step by step. As you walk through the code, you can see the variables change values, and you can watch as objects are created and destroyed. This section will provide a brief introduction to the most important parts of the debugger that accompanies the VS/VWD IDE. For complete coverage of how to use the debugger, we urge you to spend time with the documentation and to experiment freely. The debugger is one of the most powerful tools at your disposal for learning ASP.NET. An application can be configured to either enable or disable debugging. This is done through the configuration file, web.config. As you ve already seen many times, the first time you run a new application, a dialog box will pop up, offering to automatically make the necessary edits to web.config to enable debugging.
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The debugging configuration information is contained within the <compilation> section, within the <system.web> section, which in turn is contained within the <configuration> section. So, a typical compilation configuration snippet will look something like Example 8-4.
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< xml version="1.0" > <configuration> <system.web> . . . <compilation debug="true" strict="false" explicit="true"/> />
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Setting debug to false improves the runtime performance of the application.
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The Debug Toolbar
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A Debug toolbar is available in the IDE. To make it visible, click the View Toolbars menu commands, and then click Debug, if it is not checked. Table 8-2 shows the icons that appear on the Debug toolbar.
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Table 8-2. Debug toolbar icons Icon Debug menu equivalent Keyboard shortcut Description Toolbar handle. Click and drag to move the toolbar to a new location. Start/Continue Break All Stop Debugging Restart F5 Ctrl-Alt-Break Shift-F5 Ctrl-Shift-F5 Starts or continues executing the program. Stops program execution at the currently executing line. Stops debugging. Stops the run currently being debugged and immediately begins a new run. Shows next statement that will be executed. Step Into Step Over F11 F10 If the current line contains a call to a method or function, this icon will single-step the debugger into that method or function. If the current line contains a call to a method or function, this icon will not step into that method or function but will go to the next line after the call.
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8: Errors, Exceptions, and Bugs, Oh My!
Table 8-2. Debug toolbar icons (continued) Icon Debug menu equivalent Step Out Keyboard shortcut Shift-F11 Description If the current line is in a method or function, that method or function will complete and the debugger will stop on the line after the method or function call. Hexadecimal display toggle. Output Debug window selector. Toolbar options. Offers options for adding and removing buttons from all toolbars (Debug, Text Editor, and so on).
Breakpoints
The crux of the biscuit is the apostrophe. Frank Zappa, Apostrophe ( )
Breakpoints are at the heart of debugging. A breakpoint is an instruction to .NET to run to a specific line in your code and to stop and wait for you to examine the current state of the application. As the execution is paused, you can do the following: Examine and modify values of variables and expressions. Single-step through the code. Move into and out of methods and functions, even stepping into classes written in other .NET languages compliant with the Common Language Runtime. Perform any number of other debugging and analysis tasks.
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