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Figure 16-20. Visualization of an Azure table I think it s fair to say that table storage is probably not the most intuitive technology ever invented, but it is very flexible and easy to use once you get over the initial, "What the heck is this ". Items stored in table storage are created as standard .NET classes that inherit from TableServiceEntity. Another context class that inherits from TableServiceContext is also created that is used to interact with table storage. This is actually simpler than it sounds, so let s create an example of table storage now to save and retrieve a Film entity. 1. 2. 3. Create a new Cloud Service project called 16.TableStorage, adding a single ASP.NET web role to it. In the WebRole1 project add a reference to System.Data.Services.Client. Open the ServiceDefinition.csdef file and add the following entry to the ConfigurationSettings section: <Setting name="DataConnectionString" /> 4. Open ServiceConfiguration.cscfg and add the following entry to ConfigurationSettings: <Setting name="DataConnectionString" value="UseDevelopmentStorage=true" />

A delegate is a reference type and therefore has both a reference and an object. After a delegate type is declared, you can declare variables and create objects of the type. The following code shows the declaration of a variable of a delegate type: Delegate type Variable MyDel delVar; There are two ways you can create a delegate object. The first is to use an object-creation expression with the new operator, as shown in the following code. The operand of the new operator consists of the following: The delegate type name. A set of parentheses containing the name of a method to use as the first member in the invocation list. The method can be either an instance method or a static method.

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What Is Windows Presentation Foundation The Path to the Screen Documents and Fonts Graphics and Animation Styles and Control Templates Separating Visual Design from Coding WPF Prefers Vector Graphics System DPI Independence and WPF Units XAML Browser Applications (XBAPs) The Other Parts of .NET Silverlight

Add a new class to the project called AzureDataServiceContext and add the following using directives: using Microsoft.WindowsAzure.StorageClient; using Microsoft.WindowsAzure;

Instance method delVar = new MyDel( myInstObj.MyM1 ); dVar = new MyDel( SClass.OtherM2 ); Static method

Now enter the following code in AzureDataServiceContext.cs: public class AzureDataServiceContext : TableServiceContext { public AzureDataServiceContext(string baseAddress, StorageCredentials credentials) : base(baseAddress, credentials) { } public IQueryable<Film> FilmTable { get { return this.CreateQuery<Film>("Films"); } } }

Windows Presentation Foundation (WPF) is a platform for developing and running visually rich .NET programs. It consists of two elements: A set of DLLs designed for creating Windows programs with the following characteristics: Richly visual user interfaces Strong and extensive data binding

You can also use the shortcut syntax, which consists of just the method specifier, as shown in the following code. This code and the preceding code are equivalent. Using the shortcut syntax works because there is an implicit conversion between a method name and a compatible delegate type. delVar = myInstObj.MyM1; dVar = SClass.OtherM2; // Create delegate and save reference. // Create delegate and save reference.

Add a new class to the project called Film with the following using directive: using Microsoft.WindowsAzure.StorageClient;

For example, the following code creates two delegate objects one with an instance method and the other with a static method. Figure 15-4 shows the instantiations of the delegates. This code assumes that there is an object called myInstObj, which is an instance of a class that has defined a method called MyM1 returning no value and taking an int as a parameter. It also assumes that there is a class called SClass, which has a static method OtherM2 with a return type and signature matching those of delegate MyDel. delegate void MyDel(int x); MyDel delVar, dVar; Instance method delVar = new MyDel( myInstObj.MyM1 ); dVar = new MyDel( SClass.OtherM2 ); Static method // Declare delegate type. // Create two delegate variables.

A public application programming interface (API), allowing our programs to access those DLLs and use their powerful capabilities

Figure 15-4. Instantiating the delegates Besides allocating the memory for the delegate, creating a delegate object also places the first method in the delegate s invocation list. You can also create the variable and instantiate the object in the same statement, using the initializer syntax. For example, the following statements also produce the same configuration shown in Figure 15-4: MyDel delVar = new MyDel( myInstObj.MyM1 ); MyDel dVar = new MyDel( SClass.OtherM2 ); The following statements use the shortcut syntax but again produce the results shown in Figure 15-4: MyDel delVar = myInstObj.MyM1; MyDel dVar = SClass.OtherM2;

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