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CHAPTER 18 DEBUGGING A ND TESTIN G F# PROGRA MS
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Another mechanism that allows controlling the interaction between a program and the debugger is based on a set of custom attributes in the System.Diagnostics namespace. Table 18-1 shows the attributes that control in part the behavior of the debugger.
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Table 18-1. Attributes Controlling Program Behavior Under Debug
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Attribute
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DebuggerBrowsableAttribute DebuggerDisplayAttribute DebuggerHiddenAttribute DebuggerNonUserCodeAttribute
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Determines whether and how a member is displayed in the debug window. Indicates how a type or field should be displayed in the debug window. The debugger may interpret this attribute and forbid interaction with the member annotated with it. Marks code that is not user written (for instance, designer-generated code) and that can be skipped to not complicate the debugging experience. Used to locally override the usage of DebuggerNonUserCodeAttribute. The debugger may interpret this attribute and disallow stepping into the target method. Indicates a type that is responsible for defining how a type is displayed in the debug window; it may affect debugging performance and should be used only when it is really necessary to radically change how a type is displayed. Indicates for a type the type that defines how to render it while debugging.
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DebuggerStepperBoundaryAttribute DebuggerStepThroughAttribute DebuggerTypeProxyAttribute
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DebuggerVisualizerAttribute
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These attributes allow you to control essentially two aspects of the debugging: how data is visualized by the debugger and how the debugger should behave with respect to the visibility of members. The ability to control how types are displayed by the debugger can be helpful to produce customized views of data that may significantly help inspect the program state into an aggregate view. The easiest way is to use the DebuggerDisplayAttribute attribute, which supports the customization of the text associated with a value in the debugger window; an object of that type can still be inspected in every field. Consider the following simple example: [<DebuggerDisplay("{re}+{im}i")>] type MyComplex= { re : double im : double } let c = { re = 0.0; im = 0.0 } Console.WriteLine("{0}+{1}i", c.re, c.im) Here we re introducing a record named MyComplex with the classic definition of a complex number. The DebuggerDisplayAttribute attribute is used to annotate the type so that the debugger
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CHAPTER 18 DEBUGGING A ND TESTIN G F# PROGR AMS
will display its instances using the mathematical notation rather than just displaying the type name. The syntax allowed assumes that curly braces are used to indicate the name of a property whose value should be inserted in the format string. Figure 18-3 shows the result in the Visual Studio 2005 debugger: on the left side is how the debugger window appears when MyComplex is without the DebuggerDisplay annotation; on the right side the custom string appears, and the properties in the string appear in curly braces. As you can see, the difference is in the value field, and the structure can still be inspected. You can use a custom visualizer to fully customize the appearance of the data within the debugger, but it may affect debugging performance.
Figure 18-3. The MyComplex type shown by the debugger without and with DebuggerDisplay Figure 18-3 is also interesting because it shows how the debugger displays information from the compiled program. In this case, the association between the name c and the runtime local variable has been lost, and the record appears because it has been compiled by the compiler as a pair of fields and public properties. The rest of the namespace contains classes to interact with the runtime: the event logging infrastructure, processes and threads management, and the representation of the stack of a thread. Stack manipulation can be useful if it is necessary to know the call sequence that leads to executing a particular method. The StackTrace type exposes a list of StackFrame objects that provide information about each method call on the stack.
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