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This chapter took a thorough look at data binding. You learned how to create data binding expressions that draw information from other elements and custom objects and how to push changes back to the source. You also learned how to use change notification, bind entire collections, and bind to the ADO.NET disconnected data objects. In many ways, WPF data binding is designed to be an all-purpose solution for automating the way that elements interact and mapping the object model of an application to its user interface. Although WPF applications are still new, those that exist today use data binding much more frequently and thoroughly than their Windows Forms counterparts. In WPF, data binding is much more than an optional frill, and every professional WPF developer needs to master it. You haven t reached the end of your data exploration yet. You still have several topics to tackle. In the following two chapters, you ll build on the data binding basics you ve learned here and tackle these new topics: Data views. In every application that uses data binding, there s a data view at work. Often, you can ignore this piece of background plumbing. But if you take a closer look, you can use it to write navigation logic and apply filtering and sorting. Data templates. If you want to really customize the information that s shown for each record in an ItemsControl like the ListBox, you need to use a data template. Doing so gives you the ability to combine fields; lay them out in a predetermined way; add formatting; and even throw in other shapes, elements, and controls.

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Data providers. Data providers are objects that make it easier to bind to certain data sources declaratively. WPF includes two data providers: one for easy display of XML data and one for binding to the data returned by an object. These providers are somewhat limited, but they re occasionally useful for quick, straightforward data binding scenarios. Advanced data controls. Although WPF isn t nearly as mature in this area as Windows Forms, the two staples of modern windows design the ListView and TreeView support data binding in a flexible and remarkably powerful way.

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As someone who has coded before, you know that you can open, read, and write to files. The .NET Framework class library takes files and the file system in general a step further. It treats files and directories like the objects they are. It provides not only the standard I/O features you have come to expect in a framework, but also ways of dealing with files and directories as a whole. For example, it is possible to copy, move, get information about, and delete complete file and directory objects. With these functions, you now have a way of providing for the maintenance of the file system as a whole and not just the files that make up the system.

n 16, you learned the essentials of WPF data binding how to pull information out of an object and display it in a window, with little or no code. Along the way, you considered how to make that information editable, how to format it, how to convert it to the representation you need, and how to incorporate more advanced features such as validation. However, you still have more to learn. In this chapter, you ll continue your exploration by tackling three subjects that will allow you to build better bound windows. First, you ll look at data templates, which let you customize the way each item is shown in an ItemsControl. Data templates are the secret to converting a basic list into a rich data presentation tool complete with custom formatting, picture content, and additional WPF controls. Once you ve mastered data templates, you ll consider data views, which work behind the scenes to coordinate collections of bound data. Using data views, you can add navigation logic to implement filtering, sorting, and grouping. Finally, you ll end with a look at data providers, which allow you to pull information from a data source with less code.

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