TESTING AND DEBUGGING in VB.NET

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CHAPTER 16 TESTING AND DEBUGGING
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#endif authService.Login(usernameTB.Text, passwordTB.Text, null, null); #if DEBUG traceLog.WriteLine("leaving login method"); #endif } The DEBUG symbol is automatically defined for debug mode configurations, and TRACE is automatically defined for release mode configurations. There is one other approach to conditional compilation that is used to limit the type of code that can call a particular method. This is accomplished using the Conditional attribute on a method, as shown here: [Conditional("DEBUG")] public void debugWriteLine(string message) { debugLog.WriteLine(message); } A method like this can be extremely useful when providing a public API to a class library that can perform debugging. Any time client code defines the symbol applied to the method via the Conditional attribute, the code is output with the compiled IL but the code with DEBUG attribute is applicable in the debug mode only. This means a client can use the following code with the knowledge the debug writes will only happen when their code is in a debug mode configuration. public void doSomething() { library.debugWriteLine("calling doLongOperation"); library.doLongOperation(); library.debugWriteLine("doLongOperation finished"); } When you use the Conditional attribute, the method it applies to is always compiled and included in the finished assembly. This is an important difference between the Conditional attribute and preprocessor symbol testing via the #if command. If you re using Conditional to control code within the same assembly (such as making decisions based on symbols other than DEBUG/TRACE), you can prevent the body of the method from being included in the compilation by combining Conditional with #if: [Conditional("DEBUG")] public void debugWriteLine(string message) { #if DEBUG debugLog.WriteLine(message); #endif }
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Debugging Silverlight Applications with Visual Studio
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The Visual Studio debugger is an invaluable tool for tracing through code. You need to install Silverlight 4 Tools for Visual Studio 2010 (which you did in 1 while enabling Silverlight applications development) to enable Silverlight application debugging with Visual Studio.
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CHAPTER 16 TESTING AND DEBUGGING
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There s little difference between debugging .NET code on traditional Windows applications and debugging a Silverlight application. The important differences are that the Silverlight plug-in is hosted within a browser (which acts as the host process you debug) and the code on the Silverlight platform runs on the CoreCLR, a runtime completely separate from any other instance of the CLR you have on your system. Silverlight Tools does not support edit-and-continue, just-in-time, or mixed-mode debugging.
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Controlling the Debugger
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The System.Attribute is a base class for custom attributes including attributes for the System.Diagnostics namespace. Application diagnostic attributes provide cues (such as preventing stepping into certain methods) and more information to the debugger. These attributes are shown in Table 16-8. Table 16-8. Debug Attributes in System.Diagnostics
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Attribute
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DebuggableAttribute
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Description
Used to provide configuration-related cues to the JIT compiler and debugger, such as disabling optimizations. This is the only class that may affect the compilation process. The others are simply helper classes for debuggers and don t affect the code that is generated. Controls the display of a member within the debugger. Valid values are Collapsed, Never (member is never shown), and RootHidden (useful for collections; shows individual items without showing the root). Specifies what should be shown in the value column in the debugger for the member this decorates. Used to hide the member from the debugger. Indicates that a type/member is not part of the user code and should be hidden from the debugger, not stepped into. This is effectively a combination of DebuggerHiddenAttribute and DebuggerStepThroughAttribute. When applied to a method, the debugger steps through the method without stopping in a method; however, it does allow a break point (if set) in the method.
DebuggerBrowsableAttribute
DebuggerDisplayAttribute
DebuggerHiddenAttribute DebuggerNonUserCodeAttribute
DebuggerStepThroughAttribute
If you have long (or long-running) methods that you don t want to consciously step over in the debugger, using the DebuggerStepThroughAttribute attribute can save significant time. It is used to avoid stepping through code since it prevents the method from being stepped into. Here s an example usage to mark a validation function that is called often. Make sure you use it in a situation like this when you re sure the method isn t the source of any bugs.
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