qr code library c# Part I Fundamentals in C#.NET

Printer QR Code in C#.NET Part I Fundamentals

Part I Fundamentals
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LISTING .4-2 UseCustomControl .aspx markup with the custom Web control
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<form id=form1 runat=server> <div> <cc1:ServerControl1 ID="ServerControl11" runat="server" Text="When you set the control's property, it shows up in the designer..." /> </div> </form>
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Now take a moment to change a few of the control s properties and see what happens in the Designer (for example, changing the font is always very noticeable) . The properties you see in the Properties pane are all standard, and they show up because the control is derived from System.Web.UI.WebControl . . 6 . . Now add a text box and a button to the Web page, separated by breaks (<br />) . After you drop them on the page, Visual Studio adds the code shown in Listing 4-3 .
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LISTING .4-3 Revised UseCustomControl .aspx markup
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<form id=form1 runat=server> <div> <cc1:ServerControl1 ID="ServerControl11" runat="server" Text="When you set the controls property, it shows up in the designer..." /> <br /> <br /> <asp:Label ID="Label1" runat="server" Text="Type something here:"> </asp:Label> <asp:TextBox ID="TextBox1" runat="server"> </asp:TextBox> <br /> <asp:Button ID="Button1" runat="server" Text="Set Control Text" /> </div> </form>
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Notice that the standard ASP .NET controls (the button, the text box, and the label) all begin with the asp: prefix whereas the new custom control uses the prefix cc1: . Visual Studio made up the tag cc1: when you dropped the control into the Designer, although you could change this for this page by modifying the TagPrefix attribute in the Register directive .
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4 Custom Rendered Controls
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7 . . Add an event handler for the button by double-clicking the button in the Designer . After Visual Studio adds the event handler for you, have the button pull the text from the TextBox and use it to set your custom control s Text property . To do this, type in the code you see in boldface type:
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protected void Button1_Click(object sender, EventArgs e) { this.ServerControl11.Text = this.TextBox1.Text; }
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Now press Ctrl+F5 to surf to the new page with the control . When you type something into the text box and click the button, the browser sends your request to the server . The server responds by taking the text from the TextBox and using it to set the Text property of the ServerControl1 .
Notice how the new control appears in the control tree with tracing turned on . (You can turn on page tracing by setting the page s Trace property to true, as you did in 3 .)
Part I Fundamentals
You have now built a simple control . The control framework is pretty flexible, and you can send out anything you want using the RenderContents method . Next, you develop a more sophisticated control that demonstrates more advanced control rendering .
A .Palindrome .Checker
The preceding exercise shows the fundamentals of writing a simple server-side control that renders client-side markup . However, ASP .NET already delivers a perfectly good Label control . Do you really need another one To further illustrate rendered server-side controls, here s a simple control that checks to see whether the string typed by the client is a palindrome . In this exercise, you can observe some more advanced rendering techniques as well as how control events work .
Creating the Palindrome Checker control
. 1 . . To create the Palindrome Checker control, in Solution Explorer, right-click the CustomControlLib node, and click Add, New Item on the shortcut menu . Under Installed Templates, be sure the Web category is selected, and then highlight the ASP .NET Server Control node . Enter PalindromeCheckerRenderedControl .in the Name text box, and click Add to generate the code .
4 Custom Rendered Controls
2 . . Add a method to the PalindromeCheckerRenderedControl class to test for a palindrome . A palindrome is a word, sentence, or phrase that reads the same forward as it does backward (for example, radar ) . Add a method to the control that checks to see whether the internal text is a palindrome . This is a simple test for a palindrome that converts the text to uppercase, reverses it, and then compares the result to the original text . You should also strip out nonalphanumeric characters . Listing 4-4 shows some code that does the trick . (This example uses some outdated font tags; you will replace them with modern style font tags shortly .)
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