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Debug attributes are provided by the .NET Framework to allow developers to declaratively specify how they want their application to behave. Attributes are used throughout the .NET Framework but are particularly helpful in debugging scenarios. If you want to set the state of an object, typically you have to create it and set some properties. But let s say that you knew a given method was working and you never wanted the debugger to step into it. Using traditional imperative methods, you d actually have to step over it to tell the debugger to ignore it. This hardly makes any sense, does it Doing this is the equivalent of me calling everyone I know to tell them I m busy and please refrain from calling me, as opposed to simply turning off my phone. An attribute, on the other hand, describes a behavior, and callers of this object know in advance how to handle it. Because of this capability, attributes are particularly well suited to debugging scenarios. In this section, we re going to discuss the following attributes:
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DebuggerBrowsableAttribute DebuggerDisplayAttribute
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Instrumentation
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DebuggerHiddenAttribute DebuggerNonUserCodeAttribute DebuggerStepperBoundaryAttribute DebuggerStepThroughAttribute DebuggerTypeProxyAttribute DebuggerVisualizerAttribute
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Let s begin with a basic class that we can refer to before and after adding the attributes just mentioned. We ll create a simple class named SoftwareCompany that has three public properties (CompanyName, CompanyCity, and CompanyState) and three private variables (_companyName, _companyCity, and _companyState). We ll use an overloaded constructor that allows you to pass in each of these values, as demonstrated in the following code snippet:
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' VB Public Class SoftwareCompany Private _companyName As String Private _companyCity As String Private _companyState As String Public Property CompanyName() As String Get Return Me._companyName End Get Set(ByVal value As String) Me._companyName = value End Set End Property Public Property CompanyCity() As String Get Return Me._companyCity End Get Set(ByVal value As String) Me._companyCity = value End Set End Property Public Property CompanyState() As String Get Return Me._companyState End Get Set(ByVal value As String) Me._companyState = value End Set End Property
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Lesson 2: Debugging and Tracing
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Public Sub New(ByVal companyName As String, ByVal companyCity As String, ByVal companyState As String) End Sub End Class // C# class SoftwareCompany { private String _companyName; private String _companyState; private String _companyCity; public String CompanyName { get { return _companyName; } set { _companyName = value; } }
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public String CompanyState { get { return _companyState; } set { _companyState = value; } }
public String CompanyCity { get { return _companyCity; } set { _companyCity = value; } } public SoftwareCompany(String companyName, String companyState, String companyCity) { this._companyCity = companyCity; this._companyName = companyName; this._companyState = companyState; } }
Now go to the main method of whichever language you re using and insert the following code:
' VB Dim Company As New SoftwareCompany("A Datum", "Miami", "Florida") // C# SoftwareCompany Company = new SoftwareCompany("A Datum", "Florida", "Miami");
10
Instrumentation
Set a breakpoint on the line of code just shown, run the code, and then examine the Locals window after execution. You should see something approximating Figure 10-7.
Figure 10-7
Locals window from the SoftwareCompany class
DebuggerBrowsableAttribute
Notice that you see each of the members of the class, including both private members (_companyName, _companyCity, and _companyState) and public members (CompanyName, CompanyCity, and CompanyState). Go back to the private members of the class, add the DebuggerBrowsableAttribute, and set the DebuggerBrowsableState to never. Your code, which references the Sytems.Diagnostics namespace, should look like the following:
CAUTION
DebuggerBrowsable not supported in Visual Basic
The following code in the Visual Basic example is provided solely so there is a Visual Basic counterpart for each C# example and vice versa. This attribute is not supported in Visual Basic; however, using it will not throw an exception or cause any other discernible problem. Visual Basic does support the DebuggerDisplayAttribute, which closely approximates the behavior of the DebuggerBrowsable attribute.
' VB <DebuggerBrowsable(DebuggerBrowsableState.Never)> _ Private _companyName As String <DebuggerBrowsable(DebuggerBrowsableState.Never)> _ Private _companyCity As String <DebuggerBrowsable(DebuggerBrowsableState.Never)> _ Private _companyState As String // C# [DebuggerBrowsable(DebuggerBrowsableState.Never)] private String _companyName; [DebuggerBrowsable(DebuggerBrowsableState.Never)] private String _companyState; [DebuggerBrowsable(DebuggerBrowsableState.Never)] private String _companyCity;
Run the program again, and examine the output in the Locals window. You should see something similar to Figure 10-8.
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