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There are four predefined DataGrid column types: DataGridTextColumn, DataGridCheckBoxColumn, DataGridHyperlinkColumn, and DataGridComboBoxColumn. There is also the DataGridTemplateColumn, which allows you to specify your own column types. Since the DataGrid is derived from ItemsControl (through several intermediate classes), you can attach data to a DataGrid using either its Items property or its ItemsSource property.
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CHAPTER 16 TREES, TABS, AND OTHER CONTROLS
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The following is the markup that produces the DataGrid shown in Figure 16-18. Notice the Width attributes in the last two column definitions. The first one is set to SizeToHeader, and the last one is set to *. The Width property of a DataGrid column can have a numerical value as you ve seen with Widths throughout the text. Beyond that, however, it can have several other interesting values, which are the following: Auto: This is the standard automatic sizing mode, which determines the size necessary to fit all the content. SizeToCells: This determines the size necessary to display the content of the data cells, regardless of the size of the header. SizeToHeader: This determines the size necessary to display the header, regardless of the size of the content of the data cells. *: Star sizing specifies that this column should take up the remaining width of the DataGrid or split the remaining width among the other star-sized columns.
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<StackPanel> <DataGrid Name="dg" AutoGenerateColumns="False" Margin="10"> <DataGrid.Columns> <DataGridTextColumn Binding="{Binding FirstName}" Header="First Name"/> <DataGridTextColumn Binding="{Binding LastName}" Header="Last Name"/> <DataGridCheckBoxColumn Binding="{Binding HasRoadster}" Header="Has Roadster" Width="SizeToHeader"/> Width <DataGridTextColumn Binding="{Binding Age}" Header="Age" Width="*"/> Width </DataGrid.Columns> </DataGrid> </StackPanel>
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CHAPTER 16 TREES, TABS, AND OTHER CONTROLS
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Figure 16-20 illustrates the structure of the example program. The DataGrid defines four columns, and the data is taken from a List<> of Person objects.
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Figure 16-20. The structure of the example program The following is the code-behind for the program. The Person class, with four properties, is declared at the top of the file. The Window class, declared at the bottom, creates a List of four Person objects and assigns the List to the DataGrid s ItemsSource property. class Person { public string public string public int public bool
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FirstName LastName Age HasRoadster
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{ { { {
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get; get; get; get;
set; set; set; set;
} } } }
public Person(string fName, string lName, int age, bool hasRoadster) { FirstName = fName; LastName = lName; Age = age; HasRoadster = hasRoadster; } } public partial class Window1 : Window { List<Person> _people = new List<Person>(); public Window1() { InitializeComponent(); _people.Add(new _people.Add(new _people.Add(new _people.Add(new } } Person("Sherlock", Person("Jane", Person("Nancy", Person("Charlie", "Holmes", "Marple", "Drew", "Chan", 54, 60, 16, 50, false)); false)); true)); false));
dg.ItemsSource = _people;
CHAPTER 16 TREES, TABS, AND OTHER CONTROLS
Figure 16-21 illustrates additional properties of the DataGrid control that allow you to customize its appearance. You can use Brushes, Styles, and Templates to control the appearances of most of the DataGrid s parts.
Figure 16-21. Some of the important properties available for formatting the DataGrid control Figure 16-22 illustrates properties of the DataGrid associated with rows or cells the user selects.
Figure 16-22. Properties of the DataGrid control that deal with selected rows and items
CHAPTER 16 TREES, TABS, AND OTHER CONTROLS
Summary
In this chapter, I covered controls that didn t fit into categories earlier in the text and also three controls introduced in WPF 4.0. The TreeView control is ideal for representing hierarchical collections. It consists of a set of nodes, where each node can have subnodes, down to arbitrary depth. The TabControl is a panel that acts like a file folder, where every tab contains a different set of content. The Calendar control presents the visual display of a calendar, and the user can select dates on the calendar. You can programmatically restrict the calendar to show only ranges of dates or to include blackout dates, which the user can t select. Calendar is new with WPF 4.0. The DatePicker control presents a text box for the user to enter a date. At the right of the text box is an icon that can display the Calendar control, from which the user can select a date. DatePicker is new with WPF 4.0. The DataGrid control is a powerful grid control for displaying data. DataGrid is new with WPF 4.0.
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