how to generate qr code in using c# Xaml and Code Behind in C#

Generator QR Code in C# Xaml and Code Behind

Xaml and Code Behind
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Xaml is an XML-based markup language that can be used to construct a user interface. Xaml is a former acronym it used to be short for eXtensible Application Markup Language, but as so often happens, for obscure marketing reasons it officially no longer stands for anything. And to be fair, most acronyms are reverse-engineered the usual process is to look through the list of unused and pronounceable (it s pronounced Zammel, by the way) three- and four-letter combinations, trying to think of things that the available letters might plausibly stand for. Since etymology can t tell us anything useful about what Xaml is, let s look at an example. As always, following the examples yourself in Visual Studio is highly encouraged. To do that, you ll need to create a new Silverlight project. There s a separate section under Visual C# in the New Project dialog for Silverlight projects, and you should choose the Silverlight Application template. (Or if you prefer, you can find the WPF Application template in the Windows section underneath Visual C#, although if you choose that, the details will look slightly different from the examples in this chapter.) When you create a new Silverlight project, Visual Studio will ask you if you d like it to create a new web project to host the Silverlight application. (If you add a Silverlight project to a solution that already contains a web project, it will also offer to associate the Silverlight application with that web project.) Silverlight applications run from the web browser (initially, at least), so you ll need a web page simply to run your code. It s not strictly necessary to create a whole web application, because if you choose not to, Visual Studio will just generate a web page automatically when you debug or run the project, but in general, Silverlight projects are an element of a web application, so you d normally want both kinds of projects in your solution. Let it create one for now.
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If you were building a WPF application, you wouldn t have an associated web project, because WPF is for standalone Windows desktop applications.
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Once Visual Studio has created the project, it shows a file called MainPage.xaml. This is a Xaml file defining the appearance and layout of your user interface. Initially, it contains just a couple of elements: a <UserControl> at the root (or a <Window> in a WPF project), and a <Grid> inside this. We ll add a couple of elements to the user interface so that there s something to interact with. Example 20-1 shows the Xaml you get by default with a new Silverlight project, along with two new elements: a Button and a TextBlock; the additional content is shown in bold.
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<UserControl x:Class="SimpleSilverlight.MainPage" xmlns="" xmlns:x="" xmlns:d="" xmlns:mc="" mc:Ignorable="d" d:DesignWidth="640" d:DesignHeight="480" d:DesignHeight="300" d:DesignWidth="400"> > <Grid x:Name="LayoutRoot" Background="White"> <Button x:Name="myButton" HorizontalAlignment="Center" VerticalAlignment="Top" FontSize="20" Content="Click me!" /> <TextBlock x:Name="messageText" Text="Message will appear here" TextWrapping="Wrap" TextAlignment="Center" FontSize="30" FontWeight="Bold" HorizontalAlignment="Center" VerticalAlignment="Center" /> </Grid> </UserControl>
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Visual Studio presents Xaml in a split view. At the top it shows how it looks, and at the bottom it shows the Xaml source. You can either edit the source directly or drag items around on the design view at the top, adding new items from the Toolbox. As you make changes in one view the other view updates automatically.
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If you run the application by pressing F5, Visual Studio will show the Silverlight application in a web page, as you can see in Figure 20-1.
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This simple Silverlight example contains a button, but if you click it, nothing will happen because we have not defined any behavior. Xaml files in WPF and Silverlight are usually paired with a so-called code behind file, a C# (or VB.NET, or whatever language you re using) file that contains code associated with the Xaml file, and we can use this to make the button do something. The easiest way to add a click handler for the button to your code behind is from the Xaml file. You can just double-click the button on the design view and it will add a click handler. In fact, most user interface elements offer a wide range of events, so you might want a bit more control. You could select the item on the design surface and then go to the Properties panel it has an Events tab that lists all the available events, and you can double-click on any of these to add a handler. Or if you prefer typing, you can add a handler from the Xaml source editor view. If you go to the Button element and start adding a new Click attribute, you ll find that when you type the opening quote
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for the attribute value an IntelliSense pop up appears showing the text <New Event Handler> . If you press the Tab or Enter key, Visual Studio will fill in the attribute value with myButton_Click. No matter which way you add an event, Visual Studio populates the attribute by taking the first part from the element s name, as specified with the x:Name attribute, and adding the event name on the end:
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<Button x:Name="myButton" HorizontalAlignment="Center" VerticalAlignment="Top" FontSize="20" Content="Click me!" Click="myButton_Click" />
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It doesn t just edit the Xaml it also adds a method with this name to the code behind file. You can go to the code behind by pressing F7, or you can find it in the Solution Explorer if you expand a Xaml file node, you ll see a .xaml.cs file inside it, and that s the code behind. Example 20-2 shows the click handler, along with some additional code in bold. (You re not obligated to use this naming convention for handlers, by the way. You could rename it after Visual Studio creates the handler, as long as you change both the Xaml and the code behind.)
private void myButton_Click(object sender, RoutedEventArgs e) { messageText.Text = "Hello, world!"; }
Because the Xaml refers to this handler method in the Button element s Click attribute, the method will run anytime the button is clicked. The one line of code we added here refers to the TextBlock element. If you look at the Xaml, you ll see that the element s x:Name attribute has a value of messageText, and this lets us use this name in the code behind to refer to that element. Example 20-2 sets the Text property, which, as you ve no doubt guessed, causes the TextBlock to show the specified text when the button is clicked.
Just to be clear, this is happening on the client side. The Silverlight plugin downloads your application and then renders the UI as defined by your Xaml. It hosts your code behind (and any other code in your Silverlight project) inside the web browser process, and calls the specified event handlers without needing to communicate any further with the web server. Silverlight applications can communicate back with the web server after being loaded, but this click-handling interaction does not involve the server at all, unlike clicking a button on a normal web form.
The Xaml in Example 20-1 and the C# in Example 20-2 both set the Text of the TextBlock. The Xaml does this using standard XML s attribute syntax, while the C# code does it using normal C# property syntax. This highlights an important feature of Xaml: elements typically correspond to objects, and attributes correspond either to properties or to events.
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