c# barcode generator free Part V in Visual C#

Painting QR in Visual C# Part V

Part V
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Dynamic Data, XBAP, MVC, AJAX, and Silverlight
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8 . . Now add a StackPanel to the grid and place it in the second column . Add a Button to the StackPanel, followed by a ListBox with some contained items . Following the first ListBox, nest another StackPanel in the outer StackPanel orient this one horizontally by setting the Orientation property to Horizontal . Place two more ListBoxes in the nested StackPanel:
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<UserControl x:Class="SilverlightLayout.MainPage" xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation" xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml" xmlns:d="http://schemas.microsoft.com/expression/blend/2008" xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006" mc:Ignorable="d" DesignWidth="600" DesignHeight="600"> <Grid x:Name="LayoutRoot" Background="White" ShowGridLines="True"> <Grid.ColumnDefinitions> <ColumnDefinition ></ColumnDefinition> <ColumnDefinition ></ColumnDefinition> </Grid.ColumnDefinitions> <! - Canvas goes here... --> <StackPanel Grid.Column="1"> <Button Content="Button1"></Button> <ListBox Height="75"> <ListBoxItem Content="Item 1"></ListBoxItem> <ListBoxItem Content="Item 2"></ListBoxItem> <ListBoxItem Content="Item 3"></ListBoxItem> <ListBoxItem Content="Item 4"></ListBoxItem> <ListBoxItem Content="Item 5"></ListBoxItem> </ListBox> <StackPanel Orientation="Horizontal"> <ListBox Height="75"> <ListBoxItem Content="Item 1"></ListBoxItem> <ListBoxItem Content="Item 2"></ListBoxItem> <ListBoxItem Content="Item 3"></ListBoxItem> <ListBoxItem Content="Item 4"></ListBoxItem> <ListBoxItem Content="Item 5"></ListBoxItem> </ListBox> <ListBox Height="75"> <ListBoxItem Content="Item 1"></ListBoxItem> <ListBoxItem Content="Item 2"></ListBoxItem> <ListBoxItem Content="Item 3"></ListBoxItem> <ListBoxItem Content="Item 4"></ListBoxItem> <ListBoxItem Content="Item 5"></ListBoxItem> </ListBox> </StackPanel> </StackPanel> </Grid> </UserControl>
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24 Silverlight and ASP.NET
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The layout should appear like this when you re finished:
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This example shows that you can nest Silverlight layout panels arbitrarily . In addition to the three panels available as part of the official control set, you can write your own custom panel by deriving from the Panel class .
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Integrating .with .HTML
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Silverlight offers two paths for integrating with traditional Web content (that is, HTML) . First, Silverlight components can access the Document Object Model (DOM) . Second, JavaScript within a Web page can access Silverlight components . To access HTML elements from within Silverlight, use the System.Windows.Browser. HtmlDocument class . The HtmlDocument class is loaded with the HTML Document Object Model of the currently loaded Web page . It s available through the static Document member of System.Windows.Browser.HtmlPage . You can find elements identified in the HTML document using HtmlDocument.GetElementByName or HtmlDocument.GetElementById . From there, you can access the data within the tags and use the data programmatically . In addition, you can attach managed events to the HTML elements (for example, to input buttons) and handle the events from managed code rather than from JavaScript . For example, take a look at the following code, which shows some HTML with the tags identified through the ID attribute:
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<input id="input" type="text" /> <input id="submit" type="button" value="Submit" /> <div id="output" />
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Part V
Dynamic Data, XBAP, MVC, AJAX, and Silverlight
Accessing the DOM is straightforward . In the Silverlight component code, declare separate HtmlElements for each tag you want to access within the DOM . You find the HtmlElement definition in the System.Windows.Browser namespace . The HtmlDocument class (available through the HtmlPage class) gives you access to the tags . The most useful methods of the HtmlElement class are GetProperty, SetProperty, and AttachEvent . The following code illustrates how to access the identified tags through the HtmlDocument class . It also shows how to get and set properties within the tag and how to attach events (for example, how to attach a click handler to the button tag) . The HTML DOM helper classes are in the System. Windows.Browser namespace .
namespace UseDOM { public partial class MainPage : UserControl { HtmlElement _input; HtmlElement _output; HtmlElement _submit; public MainPage() { InitializeComponent(); HtmlDocument document = HtmlPage.Document; _input = document.GetElementById("input"); _output = document.GetElementById("output"); _submit = document.GetElementById("submit"); } _submit.AttachEvent("onclick", OnSubmit);
void OnSubmit(object sender, HtmlEventArgs ea) { string input = (string)_input.GetProperty("value"); string output = "you typed: " + input; _output.SetProperty("innerHTML", output); }
So that you can access managed code from within JavaScript, Silverlight includes the [ScriptableType] attribute that you use to mark entire types as scriptable and the [ScriptableMember] attribute that you use to mark individual type members as scriptable . The System.Windows.HtmlPage class includes two methods for registering managed types to make them available to script: RegisterCreatableType allows fresh instances of the type to be created from within script, and RegisterScriptableObject allows access to already-existing instances of the type . From there, use the Silverlight plug-in s content member to create the type or look up the existing instance . Then, you can use the type from within script code and treat it as though it was a normal JavaScript object .
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