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WPF has a data control concept similar to the data source control concept from ASPNET 20 In WPF, these data controls are called data providers, and they allow declarative data access from your XAML code, or your code-behind Data provider controls are powerful, because they abstract the concept of data access within a WPF form, and they can support additional behaviors such as providing asynchronous access to data As with ASPNET, WPF provides an ObjectDataProvider control that might, at first glance, appear to be a good way to work with CSLA NET style business objects Unfortunately, the ObjectDataProvider has some of the same limitations as the ASPNET ObjectDataSource control: It requires a public constructor It has no way to call a static (or any other type of) factory method CSLA .

CloudStorageAccount account = CloudStorageAccount.FromConfigurationSetting("DataConnectionString"); CloudBlobClient blobClient = account.CreateCloudBlobClient(); CloudBlobContainer container = blobClient.GetContainerReference("podcasts");

{ e.Description = String.Format( "{0} can not exceed {1} characters", e.PropertyName, max.ToString()); return false; } return true; } This is similar to the StringRequired() rule method, except that the RuleArgs parameter is cast to the MaxLengthRuleArgs type so that the MaxLength value can be retrieved. That value is then compared to the length of the specified property from the target object to see if the rule is broken or not.

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NET style business objects have non-public constructors, and factory methods are used to create or retrieve the object Additionally, CSLA NET objects intrinsically support n-level undo and persistence, and the ObjectDataProvider has no knowledge of those capabilities either What s needed is a data provider control that understands how to call static factory methods and how to manage the object s lifetime: interacting with n-level undo and CSLA NET style object persistence The CslaDataProvider is a WPF data provider control that understands how to interact with CSLA NET business objects This control can not only create or retrieve a business object, but it can also manage the object s entire lifetime through to saving (inserting, updating or deleting) the object into the database or canceling any changes made to the object by the user.

container.GetBlobReference("videopodcast01.wmv"); container.DownloadFile("videopodcast01.wmv");

It might seem like the RuleArgs parameter should just be of type MaxLengthRuleArgs. But it is important to remember that this method must conform to the RuleHandler delegate defined in 3; and that defines the parameter as type RuleArgs.

The code in listing 10.9 will download the entire movie; in this example, we want to split the movie up into manageable chunks. Currently, the storage client sample code doesn t provide the ability to download a specified portion of the file, even though the underlying REST API does support this. The code shown in listing 10.10 will download the entire podcast using HttpWebRequest.

Finally, like many other data provider controls, CslaDataProvider supports asynchronous loading of the object by implementing an IsAsynchronous property This can be a powerful feature in many cases, because it tells the control to create or retrieve the object on a background thread, and the UI updates automatically when the process is complete..

A business object s AddBusinessRules() method would associate a property to this rule like this: protected override void AddBusinessRules() { ValidationRules.AddRule( new RuleHandler(CommonRules.StringMaxLength), new CommonRules.MaxLengthRuleArgs("Name", 50)); } Remember that in 3 the ValidationRules.AddRule() method included an overload that accepted a rule method delegate along with a RuleArgs object. In this case, the RuleArgs object is an instance of MaxLengthRuleArgs, initialized with the property name and the maximum length allowed for the property. The CommonRules class includes other similar rule method implementations that you may choose to use as is, or as the basis for creating your own library of reusable rules for an application.

string baseUri = @"http://silverlightukstorage.blob.core.windows.net/"; HttpWebRequest hwr = Generates HttpWebRequest CreateHttpRequest(new Uri(baseUri +"podcasts/videopodcast01.wmv"), "GET", new TimeSpan(0, 0, 30)); // TODO: Range Header goes here Restricts download DownloadFile(hwr," videopodcast01.wmv");

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