make barcode with vb.net 19: Windows Presentation Foundation in Visual C#.NET

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19: Windows Presentation Foundation
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Each WPF application uses a distinct namespace, defined by the Microsoft XAML schema, and you can add your own objects to that namespace. XAML contains several elements for positioning other elements within the application, including the Grid and Stackpanel elements. You can set the properties of XAML elements in the Properties window, or by editing the XAML directly. Event handlers for WPF elements are kept in a code file, written in C# or another .NET language. Resources allow you to define properties for use by any appropriate element in the application. Resources require you to define a key in the current namespace so that you can refer to them later in the application. A Style element, which can be defined on an element or as a resource, can contain a number of Setter elements that define specific properties of the target element. Routed events in WPF can be associated with triggers, which can change the properties of elements in response to events. Triggers can be defined on individual elements, or as resources. Animation elements are contained within Storyboard elements. There are different animation elements depending on the type of the value that the animation is changing. A trigger can contain a storyboard action, which can contain a storyboard element, but a trigger cannot contain a storyboard by itself. Many triggers can be declared completely declaratively, without needing to write any C# code. The DataContext property allows an element to access a data source. Your skills have come a long way from where they were at the beginning of the book, through the various pieces of the C# language, and now into Windows applications in a couple of different ways. There s still one major piece of the development puzzle that we ve left untouched, though: handling data. You saw in the Presidential Browser application in this chapter that you had to handcode the URLs for 20 images into the Resources section of your application; that s a real pain. It would have been much easier if you could have read the information directly from a repository of some kind. Fortunately, many such repositories are available, from simple XML files to full-fledged SQL databases, and C# can access many of them. We ll spend the final two chapters of this book looking at how to access data from C#, first with ADO.NET and then with the newer Language Integrated Query (LINQ) methods.
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Question 19-1. What is XAML Question 19-2. What are two ways to edit the properties of a XAML element Question 19-3. What does the x: refer to in element definitions Question 19-4. What s the syntax for the Margin property Question 19-5. If you had an application with 32 buttons, what s the easiest way to ensure that all the buttons are colored blue Question 19-6. What property should you use to ensure that your style will be applied to controls of only a certain type Question 19-7. What element allows you to handle certain WPF events within the XAML file Question 19-8. What kind of control contains an animation Question 19-9. What is the purpose of the BeginStoryboard element Question 19-10. What property do you use to enable an element to access a data source
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Exercise 19-1. We ll start things off simply. Create a WPF application with several Button and TextBox controls. Set the TextBox controls to have white text on a blue background, and the Button controls to have green text on a gray background. Exercise 19-2. Now you ll create your own animation. Create a WPF application with a single Button control (it doesn t have to do anything). Add an animation that increases the size of the button from the standard size to 300 units wide by 200 units high, and then reverses itself. Exercise 19-3. Create a rectangle, 100 by 200. Add three buttons to the application: one to rotate the rectangle clockwise, the second to rotate it counterclockwise, and the third to stop the rotation.
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