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For the Purchase Tracker sample application: Open the Product class in the Code Editor Add the Create method, as defined in this section Open the ProductWin form in the Code Editor In the Load event for the ProductWin form, modify the code to call the Create method and display the resulting values:
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Dim prod as Product prod = New Product prod = prodCreate(1) DebugWriteLine(prodProductID) DebugWriteLine(prodProductName) ' Displays Mithril Coat DebugWriteLine(prodInventoryDate) ' Displays 4/1/2006 12:00:00 AM ' Displays 1
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Run the application It displays your splash screen and then shows the MDI parent form Select Products | Manage Products to display the ProductWin form The debug messages appear in the Immediate window (Debug | Windows | Immediate) or in the Output window (Debug | Windows | Output), depending on your settings
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Parameters to methods are passed either ByVal or ByRef ByVal is short for by value and means that the parameter value is evaluated and then its value is passed to the method ByRef is short for by reference and means that a reference to the parameter is passed to the method If you don t specify the passing mechanism, the default is ByVal In most cases, you want to pass your parameters by value
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NOTE FOR VB6 DEVELOPERS: The default in the classic versions of Visual Basic was ByRef, so watch for this when converting from VB6 to Visual Basic 2005
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The only time you need to use ByRef is when you want to modify the parameter within the method and allow the calling code to receive the modi ed value upon return from the method call ByRef can also be used to return parameters from the method if you need more than one return value For example, a ProcessRequest method needs to return the number of items processed and a response string to the calling code The method signature uses the ByRef keyword as follows:
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Private Function ProcessRequest(ByVal requestType As String, _ ByRef requestResponse As String) As Integer Dim itemsProcessed As Integer = 0 ' Code that performs the request requestResponse = "Test Reply" Return itemsProcessed End Function
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This function is called as follows:
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Dim requestCount As Integer Dim response As String requestCount = ProcessRequest("Test", response) DebugWriteLine(requestCounttoString & " " & response) ' Displays 0 Test Reply
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If the requestResponse parameter was declared using the ByVal keyword, the response variable would always return Nothing, because it would not pass back the changed value from the function By using the ByRef keyword, the response variable is set to the changed value
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It is always a good idea to add documentation for a method immediately after creating the method You may even want to add the documentation just after de ning the method signature and before you write the code within the method By adding the documentation right away, you focus on the method s purpose, which helps you keep the method encapsulated It is also much easier to document each method as you go along instead of facing the large task of going back later and documenting all the methods To document the method: 1 Open the class in the Code Editor 2 Move the insertion point immediately before the word Public in the Public Function or Public Sub statement 3 Type three comment markers, de ned in Visual Basic as apostrophes ('''), and press the Enter key
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The XML comments feature automatically creates the structure of your method documentation as follows:
''' ''' ''' ''' ''' ''' <summary> </summary> <param name="prodID"></param> <returns></returns> <remarks></remarks>
Notice how this automatically generates a param tag with the name of each method parameter
NOTE: If you type the three comment markers in the empty line above the method definition instead of on the same line as the method definition, you don t need to press the Enter key to generate the documentation structure
4 Type a summary of the method between the summary tags, the parameter descriptions between the param tags, and so on Your documentation may be similar to this:
''' ''' ''' ''' ''' ''' ''' <summary> Creates a populated instance of this class </summary> <param name="prodID">ID of the product to create</param> <returns>Instance of the Product class</returns> <remarks></remarks>
most important tags because they are used by Visual Studio When you provide method documentation using XML comments, your method displays documentation about itself in appropriate places within Visual Studio For example, the documentation appears in the Intellisense List Members box when you type the object variable name and a period () Using XML comments to document your methods makes it easier for you and other developers to work with your methods
Use the summary tags to describe the method s purpose and the param tags to de ne each parameter The summary and param are the