visual basic barcode Exercise 11-6. Using an ASP.NET User Control for Rendering in Font

Printing Data Matrix in Font Exercise 11-6. Using an ASP.NET User Control for Rendering

Exercise 11-6. Using an ASP.NET User Control for Rendering
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In this exercise, you will modify the input experience of your custom field type. This is where users enter or edit the data of our field. You will accomplish this by creating a rendering template and connecting that rendering template to your control class. 1. In your Solution Explorer, add a new folder to the TEMPLATE folder, called CONTROLTEMPLATES. 2. In the CONTROLTEMPLATES folder, add a new text file, and name it TimesTextField.ascx. Creating a text file but naming the file TimesTextField.ascx will cause Visual Studio to treat the file as a web control, even if you do not have a web project.
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3. In the TimesTextField.ascx, enter the following code. This code, by the way, is simply the same rendering template used for the TextField rendering template in [12]\TEMPLATE\CONTROLTEMPLATES\ DefaultTemplates.ascx: <%@ Control Language="C#"%> <%@Assembly Name="Microsoft.SharePoint, Version=12.0.0.0, Culture=neutral, PublicKeyToken=71e9bce111e9429c" %> <%@Register TagPrefix="SharePoint" Assembly="Microsoft.SharePoint, Version=12.0.0.0, Culture=neutral, PublicKeyToken=71e9bce111e9429c" namespace="Microsoft.SharePoint.WebControls"%> <SharePoint:RenderingTemplate ID="TimesTextField" runat="server"> <Template> <asp:TextBox ID="TextField" MaxLength="255" runat="server"/><br> </Template> </SharePoint:RenderingTemplate> Notice that the code is plain-vanilla ASP.NET with references to the SharePoint assembly. 4. Hand that file over to your designers, and let them go bananas. However, tell them to keep the asp:TextBox with the ID="TextField" intact. I will explain why in a moment. 5. In your TimesFieldControl.cs file, override the DefaultTemplateName property as such: protected override string DefaultTemplateName { get { return "TimesTextField"; } } I bet you are itching to do the Build and Deploy dance. Before you do, however, you need to be aware of one thing. By default, WSPBuilder will upgrade a solution when you hit Deploy rather than redeploying the solution. However, in an upgrade, only existing files are replaced, and no new files are added. You added an .ascx file in this exercise, which would not have been deployed had you simply upgraded the solution. So, to do the Build and Deploy thing, you must first uninstall your solution. Luckily, uninstalling a solution is just as easy as deploying; select WSPBuilder Uninstall first. Now you can deploy again, and your results, depending on how wild your designers got, may resemble Figure 11-6.
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Figure 11-6. Look! I made a nice border!
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Now, before you start drooling over all the possibilities, let s take a look at what just happened. First, you created a new user control containing a SharePoint:RenderingTemplate tag, having a specific ID property. As you learned in 5 when we explored the default user interface, rendering templates is a method by which SharePoint utilized standard ASP.NET controls to render content. Second, you overrode the DefaultRenderingTemplate of the TimesFieldControl class. As was the case with RenderFieldForDisplay, you just take over that function from the parent class and handle it yourself, returning your own rendering template name for use in your field. Now, there is some magic going on here. Adding such a rendering template usually entails spending a lot of time in the CreateChildControls method to hook up the value of the column to the text box and reading it back out again when the user submits the form. In fact, most examples on the Wide World Web and in books usually start by making all kinds of advanced code to hook up the value with the controls in the .ascx file. So why don t we The secret to the trick is that you maintained the TextBox with ID="TextField". You see, the parent CreateChildControls method looks for a TextBox with that ID, and if it finds it, it will handle all the plumbing for you. Since you don t override the CreateChildControls method, the parent method looks through the rendering template for the same TextBox, and poof! out with a lot of plumbing code, all because you inherited from a very nice parent. This may or may not be sufficient for your needs. You may have a project that requires you to do more complex operations, but what I m trying to say here is that if you listen to your parents and learn how they do their thing, you might save yourself a lot of hassle. And now I m giving advice to teens.
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