c# thoughtworks qrcode Creating Custom Web Controls in C#

Generation QR Code 2d barcode in C# Creating Custom Web Controls

ChAPTER 7
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Recognizing QR Code In Visual C#.NET
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Creating Custom Web Controls
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FigURE 7-6 The LogoControl inside the Visual Studio page designer.
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When this control is rendered, a <div/> tag is sent to the browser from the call to RenderBeginTag. The RenderContent method sends an <img/> tag and company name within the <div/> tag. The following shows the markup as sent to a browser.
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<html xmlns="http://www.w3.org/1999/xhtml"> <head><title></title></head> <body style="font-family: Verdana"> <form method="post" action="Default3.aspx" id="form1"> <div class="aspNetHidden"> <input type="hidden" name="__VIEWSTATE" id="__VIEWSTATE" value="/wEPDwUKMTEzOTYwMzMxMGRk+C8ZqFrvNTacdRCm30XWc6KmAgUUjwIAf5zk3FGVKvc=" /> </div> <div> <div> <img src="Images/companyLogo.png" /><br />Contoso<br /> </div> </div> </form> </body> </html>
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Lesson 2: Creating Custom Web Server Controls
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ChAPTER 7
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Adding Toolbox Support for a Custom Web Server Control
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Developers are used to working with controls that originate from the Visual Studio Toolbox and provide design-time, declarative markup support. As a web server control developer, you should strongly consider providing this functionality to your users (other developers). The primary requirement that allows a custom web control to be added to the Toolbox is that the web control be placed into a separate DLL file. This typically means that the control must be created in a stand-alone ASP.NET Server Control project. To accomplish this, you can either set a project-based reference to the control (if it is in the same solution as your website) or you can right-click the Toolbox and select Choose Items. The latter option will let you browse to the user control s DLL file to add the control or controls that are contained in the file to the Toolbox. To demonstrate, suppose that the custom server controls in the examples earlier in this lesson are in their own class library, MyUserControls.dll. You can set a reference to this DLL file to add the DLL to the Bin folder of your website. You can then use the Choose Toolbox Items dialog box to select any controls within the library and add them to the Toolbox. After they have been added, you can drag these controls from the Toolbox to a webpage to set their properties declaratively. Figure 7-7 shows an example. Notice that the controls are defined in their own grouping at the top of the Toolbox. When you drag a control to the page, the control will automatically be registered; this markup is shown at the top of the page. The bottom of the page shows the control defined declaratively (including custom properties). Finally, notice on the right side of the figure that the control s DLL file is placed inside the Bin folder for the website.
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User Controls User Control Registration User Control Declaration
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User Control s files
FigURE 7-7 Externalizing controls as separate DLL files to allow for Toolbox support in Visual Studio.
ChAPTER 7
Creating Custom Web Controls
Defining a Custom Icon for Your Control
As shown earlier in Figure 7-6, the example control uses a default icon. You can add your own custom icon by using an attribute called ToolboxBitmap, which is contained in the System.Drawing namespace. You apply this attribute to your server control class. The attribute uses a custom bitmap that is 16 16 pixels in size to set a custom image in the Toolbox. The attribute allows you to specify a path to the icon as an absolute path with a drive letter specified. It also allows you to reference an embedded bitmap in your control s assembly. Clearly the second option is more practical, because it allows you to deploy your control as a single file, and you do not need to worry about where an image file might be on a user s drive. To embed your image, you first add it to your project. You then select the file in Solution Explorer and view the Properties window. From the Properties window, you set the Build Action property to Embedded Resource. This tells the compiler to embed the image as part of the DLL file. After that, all you need to do is reference the embedded image by using the ToolboxBitmap attribute class. As an example, suppose you want to create a custom icon for the LabeledTextBox web server control shown previously in Figure 7-5. You should first use the Import directive (in Visual Basic) or the using directive (in C#) to qualify use of the System.Drawing namespace to your class. You then add a 16 16 bitmap to the root of your project and set its Build Action to Embedded Resource. Finally, you set the ToolBoxBitmap class to point to the embedded resource, as shown in the following code.
Sample of Visual Basic Code <ToolboxBitmap(GetType(LabeledTextBox), _ "LabeledTbControlIcon.bmp")> _ Public Class LabeledTextBox Inherits TextBox ... Sample of C# Code [ToolboxBitmap(typeof(LabeledTextBox), "LabeledTbControlIcon.bmp")] public class LabeledTextBox : TextBox { ...
Figure 7-8 shows the results in the Toolbox. You can see that the web server control, LabeledTextBox, has a custom icon.
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