Dynamically creating XAML elements in .NET

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Dynamically creating XAML elements
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The simplest way to create XAML elements is to generate them dynamically in managed code and then add them to an existing XAML element as a child. XAML elements that can contain child elements such as a Grid or Canvas have a Children object as an attribute when they are exposed in the namescope. You can use the Add method of the Children object to add objects to an existing object.
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For example consider the following code that exposes a Canvas object using the name blankCanvas:
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<Canvas x:name= blankCanvas />
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You could use the following C# code to add a button to the Canvas:
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Button btn = new Button(); blankCanvas.Children.Add(btn);
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The Children.Add() method accepts any object that derives from the UIElement class.
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You are responsible for setting any needed attributes of the new object being added to XAML prior to adding it as a child. To illustrate this, consider the code in Listing 8.3.
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LISTING 8.3
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XAML Code That Defines a Child Grid to the Root Element That Is Used to Create New XAML Objects
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<UserControl x:Class= proj0802.Page xmlns= http://schemas.microsoft.com/client/2007 xmlns:x= http://schemas.microsoft.com/winfx/2006/xaml Width= 400 Height= 300 > <Grid x:Name= LayoutRoot Background= LightGray > <Grid x:Name= playArea VerticalAlignment= Top Height= 200 Width= 400 Background= Gray /> </Grid> </UserControl>
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The code in Listing 8.3 defines two Grid elements. The first Grid is the root element and is added to the namescope as LayoutRoot. The second Grid element is a child of the first and is added to the namescope as playArea. The C# code-behind page in Listing 8.4 adds an event handler for the playArea Grid that dynamically adds a Rectangle object to the LayoutRoot Grid.
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LISTING 8.4
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C# Code-Behind File That Adds an Event Handler to a Grid Element and Dynamically Adds Rectangle Objects to Another XAML Grid
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using using using using using using using System; System.Windows; System.Windows.Controls; System.Windows.Input; System.Windows.Media; System.Windows.Media.Animation; System.Windows.Shapes;
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namespace proj0802 { public partial class Page : UserControl { public Page() { InitializeComponent(); playArea.MouseLeftButtonUp += new MouseButtonEventHandler(playArea_Add); } void playArea_Add(object sender, MouseButtonEventArgs e) { Point location = e.GetPosition(null); Rectangle aBlock = new Rectangle(); aBlock.Height = 40; aBlock.Width = 40; aBlock.StrokeThickness = 3; aBlock.Stroke = new SolidColorBrush(Colors.Blue); aBlock.Fill = new SolidColorBrush(Colors.Red); aBlock.HorizontalAlignment = HorizontalAlignment.Left; aBlock.VerticalAlignment = VerticalAlignment.Top; aBlock.Margin = new Thickness(location.X, location.Y, 0, 0); LayoutRoot.Children.Add(aBlock); } } }
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The event handler in Listing 8.4 first gets the coordinates of the mouse click from the MouseEventArgs parameter to use later when determining the location to place the block. Then it creates a Rectangle object. At this point the Rectangle object has no color, stroke, or size. The next few lines of code set the Height, Width, and StrokeThickness. So far, setting the attributes is similar to the XAML definition.
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Notice that when it comes to setting the Stroke and Fill for the rectangle, they cannot simply be set as text; instead, a SolidColorBrush object is created with the appropriate color. This is a little different than creating the XAML. The same approach must be taken with the Margin using a Thickness object.
CAUTION
When setting attributes in code-behind pages, you need to understand what type is expected. In XAML, everything is a string; in code-behind pages, some values are strings, some are numbers, and some are specific objects.
The HorizontalAlignment and VerticalAlignment attributes are set using HorizontalAlignment and VerticalAlignment objects. These cannot simply be set to Left or Top strings. Once the appropriate attributes are set for the Rectangle object, it is added as a child attribute of the Grid element LayoutRoot. In essence, what has been done is similar to the following XAML code:
<Rectangle Height= 40 Width= 40 StrokeThickness= 3 Stroke= Blue Fill= Red VerticalAlignment= Top HorizontalAlignment= Left Margin= 20,20,0,0 />
Figure 8.2 shows the results of clicking on the playArea Grid object in the Web browser. Inside the event handler for the Grid in Listing 8.4, a new Rectangle object is generated and placed at the coordinates where the mouse is clicked.
FIGURE 8.2 Silverlight application that dynamically adds new rectangle objects to the rendered XAML each time the mouse is clicked