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The WebPartManager manages each of these activities and exposes event notifications when they occur. As you can see, there s really not a great deal that goes on without the involvement of the WebPartManager. Let s take a high-level tour through each of these categories to get a better sense of them. Keeping track of web parts At any given moment, the webpartmanager knows exactly what web parts are on a page, which zones they belong to, and whether or not the user is authorized to view them. The webpartmanager also performs operations that require a web part to be added to or removed from a page. Moving a web part between two zones is also achieved via the manager. The code that follows lists an example of how the WebPartManager adds a web part to a page at runtime.
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INTRODUCTION
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CustomWeatherPart weatherPart = new CustomWeatherPart(); weatherPart.ID = "CustomWeatherPart1"; weatherPart.NumberOfDays = 6; WebPartManager1.AddWebPart( weatherPart, WebPartZone1, WebPartZone1.WebParts.Count );
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Adding a generic web part such as a user control to the page is slightly different from adding a custom web part, because the WebPartManager must first create a GenericWebPart from whatever control is being used at the time. The following snippet of code demonstrates how the WebPartManager creates a GenericWebPart:
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TextBox textbox = new TextBox(); textbox.ID = "TextBox1"; GenericWebPart gwp = WebPartManager1.CreateWebPart(textbox); WebPartManager1.AddWebPart( gwp, WebPartZone1, WebPartZone1.WebParts.Count );
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Notice that WebPartManager first creates a GenericWebPart control, which can then be passed into the AddWebPart method. This is similar to what occurred under the covers when the Label control was turned into a GenericWebPart in the previous chapter. Managing personalization data The WebPartManager also manages the loading and saving of web part personalization data. At the beginning of the page lifecycle the WebPartManager is handed a blob of data from the personalization system, which it then distributes to each of the relevant web parts. At the end of the page lifecycle, the WebPartManager gathers up the personalization data from each of the web part controls, packages that data into a single blob, and hands it back to the Personalization system for saving. This process allows user customizations to persist across browser restarts. Personalization is a very broad topic, so I ll defer further discussion about it until chapter 6, when we can devote an entire chapter to it. Controlling lifecycle events All of the events that occur during the web part page lifecycle are tracked and exposed by the WebPartManager. For example, if you want to receive notifications about when connections are initialized, you will get them from the manager. Likewise, if you want to receive notifications whenever a user is attempting to move a web part between
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THE WEB PART MANAGER
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zones, it s the WebPartManger that will notify you of that event. The code snippet that follows is an example of how you might listen for such events and disallow the move based on some condition. For example, you could have zones within your application that can only contain five web parts. When a user attempts to drag a sixth web part into the zone, you could use the WebPartMoving event to cancel the move.
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protected void WebPartManager1_WebPartMoving( object sender, WebPartMovingEventArgs e) { bool isMoveCancelled = true; // implement some custom logic here e.Cancel = isMoveCancelled; }
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This code shows us a skeleton implementation of handling the WebPartMoving event of the WebPartManger. Typically, code would be included within this event handler that would perform logic and set the value of the e.Cancel property based on that logic. Overall there are 20 lifecycle events exposed by the WebPartManager that can be used to provide custom behaviors and control the lifecycle within our applications. Switching page modes In chapter 3 we briefly discussed the five standard modes that a web part page can enter into BrowseDisplayMode, CatalogDisplayMode, ConnectDisplayMode, DesignDisplayMode, and EditDisplayMode. We also saw that we were able to set the current mode of a page when we forced the page to be in connect mode in chapter 3. These modes are set by the WebPartManager and provide us the means to perform powerful operations on web parts such as connecting them or editing them. Importing and exporting web parts Web part controls can be exported from and imported into pages at runtime. SharePoint has a feature similar to this which allows users to discover web parts stored in a central gallery on the internet and to import them into the page. You can use the import/export capability exposed by the WebPartManager to add this SharePoint feature to your own applications. For example, you could expose methods on a web service to accept and retrieve the web part definitions that can be created by the WebPartManager. This section has presented an overview of the five categories of tasks that are performed by the WebPartManager. Throughout this chapter we will learn more about the WebPartManger by digging deeper into the inner workings of these five tasks. Understanding how to extend and control the behavior of these tasks is the key to creating truly unique portal applications.
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