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private string _url; public RSSFeedAsyncTask(string url, AsyncTaskEnded taskEnded) { _url = url; Constructor taking _asyncTaskEnded = taskEnded; end delegate method } public IAsyncResult OnBegin(object sender, EventArgs e, AsyncCallback callback, object data) { _asyncTaskDelegate = new AsyncTaskDelegate(Execute); IAsyncResult result = _asyncTaskDelegate.BeginInvoke( callback, data); Asynchronous return result; begin method } public void OnEnd(IAsyncResult result) { if (_asyncTaskEnded != null) { _asyncTaskEnded.Invoke(); } _asyncTaskDelegate.EndInvoke(result); } public void OnTimeout(IAsyncResult result) { FeedData = new XElement("Timeout"); } public void Execute() { FeedData = XElement.Load(_url); // System.Threading.Thread.Sleep(5000); } public XElement FeedData { get; protected set; } }
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The class that handles the asynchronous task contains an asynchronous task delegate and a delegate to use once the task is done. This custom class has a constructor B that takes the URL of the feed and a reference to the delegate method to use when the task is ended. Once the task is registered and ASP.NET decides to start executing the action, it will call the OnBegin method C. This method creates the asynchronous delegate for the Execute method that contains the code for requesting the feed and then starts the asynchronous call of the delegate. When the asynchronous call is done, the OnEnd method D is called. This method invokes the AsyncTaskEnded delegate passed to the constructor before ending the asynchronous call. In case of timeouts, the class has a method called OnTimeout, which is called if the operation takes too long (the default is 45 seconds). The actual method that fetches the RSS stream is the Execute method, which makes the call just as in the synchronous version of the Web Part E. When testing and debugging the Web Part, consider inserting a sleep statement here so that you can see that it performs the actions in parallel. The property FeedData is used to set and retrieve the XML from the RSS feed.
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What s left is to edit the control creation in the Web Part class. Listing 9.2 shows how the CreateChildControls method is altered and registers an asynchronous page task.
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Listing 9.2 An asynchronous Web Part that fetches an RSS feed
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private RSSFeedAsyncTask _asyncTask; BulletedList _feedItems; protected override void CreateChildControls() { if (string.IsNullOrEmpty(this.RssFeedUrl)) { HyperLink hl = new HyperLink(); hl.NavigateUrl = string.Format( "javascript:ShowToolPane2Wrapper('Edit','129','{0}');", this.ID); hl.ID = string.Format("MsoFrameworkToolpartDefmsg_{0}", this.ID); hl.Text = "Click here to configure the Web Part"; this.Controls.Add(hl); return; } _asyncTask = new RSSFeedAsyncTask( this.RssFeedUrl, feedFetched); PageAsyncTask pageAsyncTask = new PageAsyncTask( _asyncTask.OnBegin, _asyncTask.OnEnd, _asyncTask.OnTimeout, "RSSFeedAsyncTask", true); Page.RegisterAsyncTask(pageAsyncTask);
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Initialize asynchronous task
Register asynchronous task
_feedItems = new BulletedList(); _feedItems.DisplayMode = BulletedListDisplayMode.HyperLink; this.Controls.Add(_feedItems); this.ChildControlsCreated = true; } private void feedFetched() { if(_asyncTask != null && _asyncTask.FeedData != null) { XElement feed = _asyncTask.FeedData;
Execute when asynchronous task is done
var items = feed.Descendants("item").Take(this.ItemCount); foreach (var item in items) { _feedItems.Items.Add(new ListItem() { Text = item.Descendants("title").First().Value, Value = item.Descendants("link").First().Value }); } } }
The previously shown asynchronous task, in listing 9.1, is defined as a private variable. The method that s changed is CreateChildControls. Instead of directly requesting the feed, an asynchronous object B is created with the URL and the name of the
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method to run when the task is completed. A PageAsyncTask object is created C with references to OnBegin, OnEnd, and OnTimeout methods, and this object is passed to the RegisterAsyncTask D method of the ASP.NET page object. ASP.NET will then invoke all registered asynchronous tasks after the PreRenderComplete page event. The execution will continue without directly requesting the RSS feed, and you set up a Panel object to be used for adding the feed items. When the asynchronous task is finished, it will call the feedFetched E method that was passed into the custom asynchronous task class constructor. This method checks that it contains data and then retrieves the RSS feed XML from the FeedData property. The control tree is built in the same way as it was in the CreateChildControls method of the synchronous Web Part, except that you now add the feed items to the BulletedList object in a separate method. This technique is great to use when you have operations that can take a long time or that block other Web Parts from running. In this example, a web request was the bottleneck, but the issue can be other types of resources such as database calls, longrunning calculations, or even synchronization with other Web Parts or controls. You can register multiple asynchronous operations in your Web Part for example, if you need to combine two RSS feeds into one and execute those requests in parallel. By default, ASP.NET executes all registered tasks after the PreRenderComplete, but you can also manually execute all the current registered tasks by calling the ExecuteRegisteredAsyncTasks method on the Page object. Note that this will synchronize all asynchronous tasks within the current scope or Web Part and will block other Web Parts from running until the task is complete. Also note that these asynchronous operations aren t available in sandboxed solutions. These asynchronous operations were done on the server side. To improve the perceived performance, consider using asynchronous client-side operations using Ajax, which I ll discuss in the next chapter.
Improve performance of resources Most likely your application will contain images, CSS files, JavaScript, and other resources that the clients will download. Downloading a lot of content not only affects bandwidth, it also reduces the performance of the web page rendering. By taking a look at all these resources, you can improve the overall performance of your SharePoint solution. You can optimize JavaScript and CSS files by reducing whitespaces and redundant characters. You can find several tools available on the internet to help you with this. Optimizing your files will reduce the bandwidth used and the time needed to download the item.
Microsoft has released a JavaScript tool that minifies and optimizes your JavaScript files, called Microsoft Ajax Minifier 4. You can download it at
Another simple thing to do is to reduce the number of files. You can merge JavaScript and CSS files so that you have only one or just a few of each. For images it s a bit trickier
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