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Customizing and Personalizing a Web Application
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Creating a Static Connection
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To create a static connection, follow these steps: 1. Create a provider Web Part. A Provider Web Part can derive from the WebPart class, or it can simply be a Web control. You must create a public method with the ConnectionProvider attribute that returns the value that the consumer receives. The following code demonstrates a provider method:
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'VB <ConnectionProvider("User name provider", "NameProvider")> _ Public Function GetName() As String ' Name contains the user s name, read from a TextBox control Return Name End Function //C# [ConnectionProvider("User name provider", "NameProvider")]
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public string GetName()
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// Name contains the user s name, read from a TextBox control return Name; }
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2. Create a consumer Web Part. A Consumer Web Part can derive from the WebPart class or it can simply be a Web control. You must create a public method with the ConnectionConsumer attribute that accepts the same type that the provider s Con nectionProvide method returns. The following code demonstrates a consumer method:
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'VB <ConnectionConsumer("User name consumer", "NameConsumer")> _ Public Sub GetName(ByVal Name As String) greetingLabel.Text = "Welcome, " + Name + "!" End Sub //C# [ConnectionConsumer("User name consumer", "NameConsumer")]
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public void GetName(string Name)
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// greetingLabel is an existing Label control
greetingLabel.Text = "Welcome, " + Name + "!";
3. Create a Web page with a WebPartManager control. Add at least one WebPartZone container. 4. Add your provider and consumer Web Parts to WebPartZone containers.
Lesson 3: Using Web Parts
5. Within the WebPartManager control source, add a <StaticConnections> element that includes a WebPartConnection control to declare the connection between the provider and consumer. The WebPartConnection control must have an ID attribute, an attribute to identify the provider control (ProviderID), an attribute to identify the provider method (ProviderConnectionPointID), an attribute to identify the consumer control (ConsumerID), and an attribute to identify the consumer method (ConsumerConnectionPointID). You should have one WebPartConnection control for each pair of connected controls. The following markup demonstrates this:
<asp:WebPartManager ID="WebPartManager1" runat="server">
<StaticConnections>
<asp:WebPartConnection
ID="conn1"
ProviderID="getName"
ProviderConnectionPointID="NameProvider"
ConsumerID="showName"
ConsumerConnectionPointID="NameConsumer"
</StaticConnections>
</asp:WebPartManager>
This can seem confusing at first; however, Exercise 3 in this lesson s lab walks you through the process of creating controls that connect to each other and of configuring them in a Web page.
Exam Tip
For the exam, know exactly how to establish a static connection, which attributes you must assign to each method, and what you must add to the .aspx page source.
Enabling Dynamic Connections
To enable dynamic connections that a user can create or break, follow these steps: 1. Create a page with a provider and consumer connection as described in the pre vious section. 2. Optionally, establish a static connection between the provider and consumer, as described in the previous section. This acts as a default connection that a user can break if desired. 3. Add a ConnectionsZone control to the Web page. 4. Add a control to enable a user to enter the Connect mode, as described in Using Different Display Modes, earlier in this lesson.
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Customizing and Personalizing a Web Application
Establishing Dynamic Connections Between Web Parts
When a user views your page, he or she can enter Connect mode and use the Connec tionsZone control to edit connections. To edit a connection as a user, follow these steps: 1. Switch the display mode to Connect. 2. On the Web Parts menu for either the provider or the consumer, select Connect, as shown in Figure 9-9.
Figure 9-9
Select Connect from the Web Parts menu to edit the connection.
3. The ConnectionsZone object appears, as shown in Figure 9-10.
Figure 9-10 Use the Connections Zone control to dynamically establish a connection.
Lesson 3: Using Web Parts
4. If there is an existing connection, click the Disconnect button to break the cur rent connection. Otherwise, click Create A Connection To A Consumer, select the consumer, and click Connect, as shown in Figure 9-11.
Figure 9-11 Click Connect to establish a dynamic connection between Web Parts.
5. When you are done editing connections, click Close. The Web Parts are connected, just as if you had connected them statically.
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