SORTING OUT CONNECTION TYPES in .NET

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SORTING OUT CONNECTION TYPES
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<asp:WebPartManager ID="WebPartManager1" runat="server"> <StaticConnections> <asp:WebPartConnection ID="cnn" ConsumerID="NumberConsumer1" ProviderID="NumberProvider1" ProviderConnectionPointID="MyID" /> </StaticConnections> </asp:WebPartManager>
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If your web part does expose multiple consumer or provider endpoints and you fail to specify the identity of the endpoint when you configure the connection, the web part framework will look for an endpoint named default, as this is the Figure 3.6 The error shown to the user when an endpoint cannot be ascertained at runtime. standard name given to providers by the web part framework when the providers are created with no specific ID. If the web part fails to locate a provider with that name, that endpoint will not be created, and the ConnectErrorMessage will be displayed on the web part associated with the endpoint created for the connection. Figure 3.6 shows how the error would appear to an end user. All the connections we ve seen so far are referred to as static connections connections that are declared in the StaticConnections section of a WebPartManager. The participants of static connections are always known at design time and hardwired so that they do not change. Once they have been declared, the only attribute of static connections that can be altered is whether or not the connection is enabled. Static connections always have a shared scope meaning that any changes made to a static connection affect every user and not just the user making the change. Another kind of connection exists which allows connections to be discovered and created at runtime dynamic connections. As described in the next section, dynamic connections add a great deal of flexibility to a portal because not all of their details need to be known in advance. 3.3.2 Dynamic connections When using static connections, we saw that we needed to know the details of the web parts which were going to be participating in the connection in advance. That works well when the web parts are declared within a page, but what happens when they are not For example, how do we connect web parts that are dynamically loaded at runtime from a CatalogZone The answer can be found in dynamic connections.
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The ConnectionsZone Dynamic connections are not declared within the StaticConnections element, but instead require the use of their own zone called a ConnectionsZone. The ConnectionsZone provides a way for users to create and manage all the facets of connections at runtime. Like other zones such as the EditorZone and the CatalogZone the ConnectionsZone is only visible when the page is in a specific display mode. For the ConnectionsZone that mode is known as connect mode.
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There are five standard modes that a web page can enter into: BrowseDisplayMode, CatalogDisplayMode, ConnectDisplayMode, DesignDisplayMode, and EditDisplayMode. These are described in greater detail in chapter 4.
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The purpose of the ConnectionsZone is to display all the user interface elements required to dynamically discover connection endpoints and connect them together at runtime. The code that follows shows a version of the page we used in the static connections example. In this example, however, the code has been changed to support dynamic connections instead of static connections.
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<asp:WebPartManager ID="WebPartManager1" runat="server" /> <asp:WebPartZone ID="WebPartZone1" runat="server"> <ZoneTemplate> <uc1:NumberProvider ID="NumberProvider1" runat="server" /> <uc2:NumberConsumer ID="NumberConsumer1" runat="server" /> </ZoneTemplate> </asp:WebPartZone> <asp:ConnectionsZone ID="ConnectionsZone1" runat="server" />
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Notice that the WebPartManager no longer contains a StaticConnections element and that the page now has a ConnectionsZone added to it. If we run the page at this point, the chart that we originally saw in figure 3.5 on page 70 will no longer be displayed. This is because we removed the static connection that was providing it with data. We ll have to use the ConnectionsZone to dynamically configure the connection between the data part and the chart part before it is displayed. Remember that to display the connections tool zone, the page must first be in connect mode, so for the time being we ll write hard-coded logic into the load method of the page to make sure that it is. The following displays the code that is required to set the page into connect mode.
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public partial class DynamicConnectionsPage : System.Web.UI.Page { protected override void OnLoad(EventArgs e) { WebPartManager1.DisplayMode = WebPartManager.ConnectDisplayMode; } }
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