Building a Base Form Class in VS .NET

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Building a Base Form Class
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The technique you use to inherit from the base form class depends on whether you are adding the inheritance to an existing form or adding a new form to the project For existing forms, you need to change the Inherits statement in the hidden designer-generated code To de ne the inheritance for an existing form: 1 Select the Windows Application project in Solution Explorer 2 Click Show All Files on the Solution Explorer toolbar, or select Project | Show All Files from the main menu bar All the les associated with the Windows Application project appear in Solution Explorer in a tree view structure as shown in Figure 43 3 In Solution Explorer, open the node for the form for which you want to set the inheritance 4 Double-click on the designer-generated code le, which is named with the designervb extension The designer-generated partial class is then opened in the Code Editor 5 Change the Inherits statement to inherit from your base form class instead of WindowsFormsForm The resulting code looks similar to the following:
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<GlobalMicrosoftVisualBasicCompilerServices DesignerGenerated()> _ Partial Class ProductWin Inherits PTBaseWin
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The form, ProductWin in this case, now inherits from the base form class, PTBaseWin Since the base form class inherits from Windows FormsForm, the ProductWin form still behaves like a Windows form, but it also has all the attributes and behaviors of the base form class As you add forms to your application, you want them to inherit from the base form class as well The new forms then support the attributes and behaviors of the base form class, in this case consistently handling the Enter and Leave events To de ne the inheritance for a new form: 1 Select the Windows Application project in Solution Explorer 2 Right-click the project and select Build from the context menu, or select Build | Build PTWin from the main menu bar
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The project containing the base form class must be compiled for it to be found by Visual Studio 3 Add a project item to your Windows Application project selecting the Inherited Form template 4 Enter the form name and click Add The Inheritance Picker dialog is displayed, as shown in Figure 46 Notice that all the forms in your Windows Application project are displayed because nothing distinguishes a form as a base form class other than your naming convention
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The Inheritance Picker dialog allows you to select the base form class The form you are adding inherits from this class
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5 Select the base form class and click OK Visual Studio adds the new form to your project If you look at the designer-generated partial class for the new form, you will see that the Inherits statement was set to the base form class you selected in the Inheritance Picker Repeat this process for each form you add to your application If you forget to use the Inherited Form template when you add the form, you can use the steps to de ne the inheritance for an existing form, which was detailed earlier in this section Every form that inherits from the base form class has all the attributes and behaviors of the base form class You don t have to write or modify any code
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Building a Base Form Class
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For the Purchase Tracker sample application: Select the Windows Application project (PTWin) in Solution Explorer Click Show All Files on the Solution Explorer toolbar Open the ProductWinvb node in Solution Explorer Double-click on the ProductWindesignervb file to open it in the Code Editor Change the Inherits statement to inherit from your base form class (PTBaseWin) Run the application It displays your splash screen and then shows the ProductWin form Use the Tab key to move through the controls on the form The background color of each control changes to the defined color as you tab through it, just like it did before You won t fully see the benefits of inheritance until you add more forms to your application
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