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WPF supports two different interfaces for binding to collections: INotifyCollectionChanged and IBindingList. The INotifyCollectionChanged interface and the associated ObservableCollection<T> class were introduced with WPF. The INotifyCollectionChanged interface offers a simpler alternative to the relatively complex IBindingList interface. It is important to realize that WPF supports both IBindingList and INotifyCollectionChanged. If a collection implements either interface, it will work fine with WPF data binding. However, for a collection to be useful in Windows Forms as well as WPF, then IBindingList is the only valid option. A collection should never implement both interfaces. The IBindingList interface requires implementation of the ListChanged event, and INotifyCollectionChanged requires implementation of the CollectionChanged event. If a collection implements both, then it will raise both events, and WPF will respond to both events. Each action to a list affects data binding twice, so some very unexpected and undesired results would occur. I ve already discussed how the CSLA .NET collection classes inherit from BindingList<T> and thus implement IBindingList. This allows them to work properly with WPF, as well as Windows Forms and Web Forms.

private void Window_Loaded(object sender, RoutedEventArgs e) { Creates empty movieStream = movie file File.Open("videopodcast01.wmv", FileMode.Append, FileAccess.Write, FileShare.ReadWrite); GetNextChunk(); Thread.Sleep(10000); myVideo.Play(); }

The primary function of Csla.DataPortal is to determine the appropriate network protocol (if any) to be used when interacting with Csla.Server.DataPortal. Each protocol is managed by a proxy object that implements the Csla.DataPortalClient.IDataPortalProxy interface. This interface will be discussed shortly, but for now it is enough to know that it ensures that all proxy classes implement the methods required by Csla.DataPortal. The proxy object to be used is defined in the application s configuration file. That s the web. config file for ASP .NET applications, and myprogram.exe.config for Windows applications (where

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WPF data binding is powerful and fun to use. It minimizes the amount of code required in the UI, and it provides a clean layer of abstraction between the UI and your business layer. However, there are some areas where repetitive code can still be required in the UI, and to minimize this, CSLA .NET includes a set of custom WPF controls.

Before we look more carefully at the code used to progressively download the video, let s talk a bit about the Range header.

myprogram is the name of your program). Within Visual Studio, a Windows configuration file is named app.config, so I ll refer to them as app.config files from here forward. Config files can include an <appSettings> section to store application settings, and it is in this section that the CSLA .NET configuration settings are located. The following shows how this section would look for an application set to use the .NET Remoting technology: <appSettings> <add key="CslaDataPortalProxy" value="Csla.DataPortalClient.RemotingProxy, Csla"/> <add key="CslaDataPortalUrl" value="http://servername/sitename/RemotingPortal.rem"/> </appSettings> Of course, servername and sitename would correspond to a real web server and virtual root. The CslaDataPortalProxy key defines the proxy class that should be used by Csla.DataPortal. The CslaDataPortalUrl key is defined and used by the proxy object itself. Different proxy objects may require or support different keys for their own configuration data. The GetDataPortalProxy() method uses this information to create an instance of the correct proxy object: private static DataPortalClient.IDataPortalProxy _localPortal; private static DataPortalClient.IDataPortalProxy _portal; private static DataPortalClient.IDataPortalProxy GetDataPortalProxy(bool forceLocal) { if (forceLocal) { if (_localPortal == null) _localPortal = new DataPortalClient.LocalProxy(); return _localPortal; } else { if (_portal == null) { string proxyTypeName = ApplicationContext.DataPortalProxy; if (proxyTypeName == "Local") _portal = new DataPortalClient.LocalProxy(); else { string typeName = proxyTypeName.Substring(0, proxyTypeName.IndexOf(",")).Trim(); string assemblyName = proxyTypeName.Substring(proxyTypeName.IndexOf(",") + 1).Trim(); _portal = (DataPortalClient.IDataPortalProxy) Activator.CreateInstance(assemblyName, typeName).Unwrap(); } } return _portal; } } For both local and remote proxy objects, once the proxy has been created, it is cached in a static field. This avoids recreating the proxy object for every data portal call. If the forceLocal parameter is true, then only a local proxy is returned. The Csla.DataPortal Client.LocalProxy object is a special proxy that doesn t use any network protocols at all, but rather

When a GET request is made using either the storage client or via an HTTP request, the entire file is downloaded by default. The code shown in listing 10.9 will download videopodcast01.wmv from the public container, podcasts.

With the custom RuleArgs class defined, it can be used to implement a rule method. The StringMaxLength() rule method looks like this: public static bool StringMaxLength( object target, RuleArgs e) { int max = ((MaxLengthRuleArgs)e).MaxLength; string value = (string)Utilities.CallByName( target, e.PropertyName, CallType.Get); if (!String.IsNullOrEmpty(value) && (value.Length > max))

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