barcode vb.net 2013 Drilling into the Connect Class in Visual C#

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Drilling into the Connect Class
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The Connect class implements two interfaces, IDTExtensibility2 and IDTCommandTarget, and contains several members Before examining the code, you ll learn about the interfaces, their members, and purpose The purpose of the interfaces (IDTExtensibility2 and IDTCommandTarget) is to help manage the lifetime of the Add-In VS understands these interfaces, but it doesn t know anything about the code you write Therefore, you have to bridge the gap between your code and what VS needs to make an Add-In work To do this, you use a class (Connect) that implements the interfaces (IDTExtensibility2 and IDTCommandTarget) Then you place your code into methods, members of Connect, that implement (match) the interfaces When VS communicates with the interfaces, your code (implementing the interface) executes
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13: Extending Visual Studio 2010
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OnAddInsUpdate OnBeginShutdown OnConnection OnDisconnection OnStartupComplete
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Add-In is either loaded or unloaded Add-In is running and VS shuts down Add-In is loaded Add-In is unloaded VS has started up and then Add-In is loaded
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Table 13-1 The IDTExtensibility2 Interface
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It s like people from different countries trying to communicate, where they have a subject to discuss but need a common language to be able to understand each other; the common language would be the interface between the people The first interface to discuss is IDTExtensibility2, whose purpose is to let VS manage loading and unloading of the Add-In Loading and unloading are important because VS loads Add-Ins when it starts and unloads Add-Ins when it shuts down There are certain actions that you might want to take, depending on when the Add-In is loaded and what type of information you might need access to For example, the very first time an Add-In is ever loaded, you might want to perform a special operation like configuration or asking the user if she would like to register your Add-In Table 13-1 shows the members of IDTExtensibility2 and describes their purpose The second interface that Connect implements is IDTCommandTarget When building an Add-In, you need a way for the VS IDE to execute the Add-In For example, you will create a named command that exposes the Add-In as a menu item in the Tools menu Whenever a user selects the menu item, the named command will execute and run your Add-In code IDTCommandTarget is the interface VS uses to execute your Add-In Table 13-2 shows the members of IDTCommandTarget and describes their purpose Each of the methods of both the IDTExtensibility2 and IDCommandTarget interfaces are implemented by the provided Connect class Listing 13-1 shows each of these members with full documentation comments and skeleton code The code in Listing 13-1 is in C#, but it is very informative to take the overview of the interfaces from the previous table and then Member
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Purpose
Called by VS to execute your Add-In Called by VS to determine if the command should be enabled, invisible, or supported
Table 13-2 The IDTCommandTarget Interface
Microsoft Visual Studio 2010: A Beginner s Guide
take an even closer look at the comments in the code for a better understanding of what that code does The code comments are exactly the same in VB Some of the comments refer to the host application, where the host is either the VS IDE or the VS Macro Editor, as was selected while running the Add-In Project Wizard in the preceding section and shown in Figure 13-3 I ve removed the contents of each method because subsequent sections of this chapter will explain important method implementations and how to make the Add-In perform useful operations
Listing 13-1
using using using using using using using using
Skeleton code for the Connect class
System; Extensibility; EnvDTE; EnvDTE80; MicrosoftVisualStudioCommandBars; SystemResources; SystemReflection; SystemGlobalization;
namespace KeystrokeFinder { /// <summary>The object for implementing an Add-in</summary> /// <seealso class='IDTExtensibility2' /> public class Connect : IDTExtensibility2, IDTCommandTarget { /// <summary> /// Implements the constructor for the Add-in object /// Place your initialization code within this method /// </summary> public Connect() { } /// /// /// /// /// /// /// /// /// /// /// <summary> Implements the OnConnection method of the IDTExtensibility2 interface Receives notification that the Add-in is being loaded </summary> <param term='application'> Root object of the host application </param> <param term='connectMode'> Describes how the Add-in is being loaded </param>
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