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In our simple example, we used time-based buffering to delay the playback of the movie. Although time-based buffering is suitable for our example, in a production scenario you should start playing the movie after a portion of the movie has been downloaded. We also don t make any provision for variable download speeds; you might want to extend the sample to handle situations in which the playback speed is faster than the download speed.

The class also implements a constructor that accepts an IContainer parameter. This constructor is required for extender controls, and is called by Windows Forms when the control is instantiated. Notice that the control adds itself to the container as required by the Windows Forms infrastructure.

Now you have a working version of a WPF progressive-downloading media player, which shows that you can use BLOB storage as a storage service for desktop clients. With some tweaks you can build media players that perform similarly to a streaming service.

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The detailed design issues around building an ASP.NET data source control are outside the scope of this book. Nonetheless, I ll walk quickly through the code in these classes to call out the highlights of the implementation. It turns out that implementing runtime functionality is relatively straightforward, but providing design time functionality is more complex. Table 10-7 lists the classes required to implement the CslaDataSource control s runtime and design time support.

The IExtenderProvider interface defines just one method: CanExtend(). This method is called by Windows Forms to ask the extender control whether it wishes to extend any given control. Windows Forms automatically calls CanExtend() for every control on the form: public bool CanExtend(object extendee) { if (IsPropertyImplemented(extendee, "ReadOnly") || IsPropertyImplemented(extendee, "Enabled")) return true; else return false; } The ReadWriteAuthorization control can extend any control that implements either a ReadOnly or Enabled property. This covers most controls, making ReadWriteAuthorization broadly useful. If the potential target control implements either of these properties, a true result is returned to indicate that the control will be extended. The IsPropertyImplemented() method is a helper that uses reflection to check for the existence of the specified properties on the target control: private static bool IsPropertyImplemented( object obj, string propertyName) { if (obj.GetType().GetProperty(propertyName, BindingFlags.FlattenHierarchy | BindingFlags.Instance | BindingFlags.Public) != null) return true; else return false; }

In the previous section, we showed you how to build a desktop progressive-downloading media player for video podcasts. Although the desktop application is great for that

The [ProvideProperty()] attribute on ReadWriteAuthorization specified that an ApplyAuthorization property would be dynamically added to all controls extended by ReadWriteAuthorization. Of course, the controls being extended really have no knowledge of this new property or what to do with it. All the behavior associated with the property is contained within the extender control itself. The extender control manages the ApplyAuthorization property by implementing both GetApplyAuthorization() and SetApplyAuthorization() methods. These methods are called by Windows Forms to get and set the property value for each control that has been extended. The Get and Set are automatically prepended by Windows Forms to call these methods. To manage a list of the controls that have been extended, a Dictionary object is used: private Dictionary<Control, bool> _sources = new Dictionary<Control, bool>(); public bool GetApplyAuthorization(Control source) { if (_sources.ContainsKey(source)) return _sources[source]; else return false; } public void SetApplyAuthorization(Control source, bool value) { if (_sources.ContainsKey(source)) _sources[source] = value; else _sources.Add(source, value); } When Windows Forms indicates that the ApplyAuthorization property has been set for a particular extended control, the SetApplyAuthorization() method is called. This method records the value of the ApplyAuthorization property for that particular control, using the control itself as the key value within the Dictionary. Conversely, when Windows Forms needs to know the property value of ApplyAuthorization for a particular control, it calls GetApplyAuthorization(). The value for that control is retrieved from the Dictionary object and returned. If the control can t be found in the Dictionary, then false is returned, since that control is obviously not being extended. The end result here is that the ReadWriteAuthorization control maintains a list of all the controls it extends, along with their ApplyAuthorization property values. In short, it knows about all the controls it will affect, and whether it should be affecting them or not.

CslaDataSource CslaDataSourceView CslaDataSourceConfiguration CslaDataSourceDesigner CslaDesignerDataSourceView ObjectSchema ObjectViewSchema

richer client experience, we also want to show you how to provide a web-based crossplatform Silverlight experience.

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