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the List generic class. The problem with using the List class is that it does not have built-in change notifications for the collection. In order to bind a DataGrid and ListBox to dynamic data that will be updated, you should use the ObservableCollection generic class. The ObservableCollection class represents a collection of dynamic data that provides built-in notification when items in the collection are added, removed, or refreshed.
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4. Now that you have the XAML and the class defined, you can wire them up. To do this, first create an event handler for the Loaded event of the page, as follows: public partial class Page : UserControl { public Page() { InitializeComponent();
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CHAPTER 5 DATA BINDING AND SILVERLIGHT LIST CONTROLS
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this.Loaded += new RoutedEventHandler(Page_Loaded); } void Page_Loaded(object sender, RoutedEventArgs e) { } } 5. When the page is loaded, you want to call GetData() from the GridData class and bind that to the DataGrid s ItemsSource property, as follows: public partial class Page : UserControl { public Page() { InitializeComponent(); this.Loaded += new RoutedEventHandler(Page_Loaded); } void Page_Loaded(object sender, RoutedEventArgs e) { this.grid.ItemsSource = GridData.GetData(); } } 6. Build and run the application. If all is well, you should see the DataGrid displayed
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(see Figure 5-6). Let s take a few moments and play around with this DataGrid to explore some of its features. First of all, if you click any of the column headers, you will notice that sorting is automatically available, as shown in Figure 5-7. Next, if you place your cursor at the edge of one of the columns, you can use the mouse to click and drag the column s edge to resize the column, as shown in Figure 5-8. Again, this functionality is provided for free with the DataGrid s rich client-side functionality. And finally, if you click and hold the mouse on one of the column headers, then drag it left or right to another column header s edge, you will see a little red triangle appear above the columns. For instance, click and drag the Name column so the little red triangle appears to the far right, as shown in Figure 5-9. When the red triangle is where you want it, release the mouse, and you will see that the Name column now appears as the last column in the DataGrid.
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CHAPTER 5 DATA BINDING AND SILVERLIGHT LIST CONTROLS
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Figure 5-7. Sorting in the DataGrid
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Figure 5-8. Resizing columns in a DataGrid
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Figure 5-9. Column reordering in action
You ll agree that this is pretty nice out-of-the-box functionality for simply defining a
DataGrid with this code: <data:DataGrid x:Name="grid" Margin="10" />
Now that you have implemented a simple DataGrid example, let s explore some of the additional options available.
The Columns Collection
In the previous example, you allowed the DataGrid to automatically generate columns based on the data to which it was bound. This is not a new concept it has been around in data grid components since the initial release of ASP.NET. But what if you want to have some additional control over the columns that are created in your DataGrid What if you want to add a column that contains some more complex information, such as an image You can do this by first setting the AutoGenerateColumns property on the grid to false. Then you need to generate the columns manually. Columns are defined in a DataGrid using the Columns collection. The following is an example of setting the Columns collection in XAML. Notice that it sets the AutogenerateColumns property to False. If you neglect to do this, you will get all of the autogenerated columns in addition to the columns you define within the Columns collection.
CHAPTER 5 DATA BINDING AND SILVERLIGHT LIST CONTROLS
<my:DataGrid x:Name="grid" Margin="10" AutoGenerateColumns="False"> <my:DataGrid.Columns> </my:DataGrid.Columns> </my:DataGrid>
You can place three types of columns within a Columns collection: a text column (DataGridTextColumn), a check box column (DataGridCheckBoxColumn), and a template column (DataGridTemplateColumn). All of the column types inherit from type DataGridColumn. A number of notable properties apply to all three column types, as shown in Table 5-1.
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