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You can think of a delegate as an object that contains an ordered list of methods with the same signature and return type, as illustrated in Figure 15-2. The list of methods is called the invocation list. Methods held by a delegate can be from any class or struct, as long as they match both the delegate s Return type Signature (including ref and out modifiers)

To set the alignment of where to place the element within the slot, you can assign to the HorizontalAlignment and VerticalAlignment properties. Each has a choice of four enumeration values to choose from: HorizontalAlignment: Left, Center, Right, or Stretch VerticalAlignment: Top, Center, Bottom, or Stretch

10. Enter another item into the textbox and click Add. 11. Enter a further item into the textbox and click Add. 12. Click Show Queue, noting all the items displayed (Figure 16-19).

Methods in the invocation list can be either instance methods or static methods. When a delegate is invoked, each method in its invocation list is executed.

Azure table storage is the third Azure storage option and allows you to store .NET objects (entities in Azure terminology) and access them in a manner compatible with WCF Data Services. Azure table storage also requires that your entities have three additional fields: PartitionKey RowKey TimeStamp

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Delegates are types, just as classes are types. And as with classes, a delegate type must be declared before you can use it to create variables and objects of the type. The following example code declares a delegate type. Even though the delegate type declaration looks like a method declaration, it does not need to be declared inside a class because it is a type declaration.

Figure 5-5 shows the markup used to set the properties, and the screenshots on the left show the resulting windows. The button elements fill the slots (represented by the dotted lines) in the StackPanel container. Don t worry about the details of the StackPanel container for right now, since we ll look at it shortly. But the first StackPanel stacks the buttons vertically, and the second one stacks them from the left to right.

Keyword Delegate type name delegate void MyDel ( int x ); The declaration of a delegate type looks much like the declaration of a method, in that it has both a return type and a signature. The return type and signature specify the form of the methods that the delegate will accept. For example, the following code declares delegate type MyDel. This declaration specifies that delegates of this type will only accept methods that have a single int parameter and that have no return value. Figure 15-3 shows a representation of the delegate type on the left and the delegate object on the right. Delegate type name delegate void MyDel( int x ); Return type Signature

PartionKey and RowKey are combined as a composite key to uniquely identify a row, so it is important the combination of the two must be unique (Figure 16-20). The PartitionKey can be used by Azure to divide data up onto different servers for load-balancing purposes, while TimeStamp is used for conflict resolution.

This book was written for intermediate to advanced programmers who want to write Windows programs using the WPF UI framework. It assumes that you re familiar with C# and that you have some experience with Visual Studio. You can download the source code for all the example programs from the Apress web site. And although I can t answer specific questions about your code, you can contact me with suggestions for the book at dansolis@sbcglobal.net. I hope this book makes learning WPF an enjoyable experience for you! Take care. Dan Solis

Figure 15-3. Delegate type and object The delegate type declaration differs from a method declaration in two ways. The delegate type declaration Is prefaced with the keyword delegate Does not have a method body

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