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3. This is the tricky part: return to the TimesFieldType.cs file, and override the FieldRenderingControl property as such: public override Microsoft.SharePoint.WebControls.BaseFieldControl FieldRenderingControl { get { TimesFieldControl c = new TimesFieldControl(); c.FieldName = this.InternalName; return c; } } What you are doing by overriding the FieldRenderingControl property is overriding which control will be used to render the field rather than using whatever the parent class wants you to use. You are returning a new instance of the TimesFieldControl class you just created and making sure your control gets the name of your field type, which would be EmpireType, which you defined in the fldtypes_TimesFieldType.xml definition earlier. Oh, and by the way, the part about this being tricky Irony. Again, you re done. And again, yes, I am being serious.
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OK, so what did you just do First you created a new field control class that you can use to define custom rendering of the field type. You haven t really done any custom rendering yet, but you have the class in place. Next you connected that field control to the field type class by overriding the FieldRenderingControl property, effectively saying to the parent class that, yes, you appreciate the years of upbringing, love, and support, but now you want to stand on your own feet. You just took the first step to break the tight bonds to our parents, so to speak. Compare this to getting your own place to stay when you turn 18 but not moving in just yet. This way of building a custom field type is really a perfect transition into adulthood for the field type. You maintain close ties with the parent class and only slowly do what you need and want to get your own independence. And, being the perfect parent, the parent class happily continues to supply you with whatever functionality you choose not to implement yourself, allowing you to move out at just the pace you want. And now I m giving out parenting advice. It s time to get back to the bits and bytes, but keep the parent-child relationship in mind; it makes development a lot more manageable. For the basic outline of a custom field type, this really is all you need to do, but it is time to take your first step into custom rendering and explore how you can make the display of the column a bit more interesting. First, take a look at Figure 11-4, just to make sure you see what the default value looks like. As you can see, it is exactly like a regular text field.
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Figure 11-4. Baseline for rendering. You don t want this.
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Exercise 11-5. Modifying the Display of a Custom Field Type
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In this exercise, you ll modify the rendering of your custom field type. You will first focus on one method, rendering in code, for changing the display of data before you modify the input experience using a custom user control in the next exercise. 1. Open the TimesFieldControl.cs file. Inside the class, override the RenderFieldForDisplay method as such: protected override void RenderFieldForDisplay(System.Web.UI.HtmlTextWriter output) { output.Write("<span style=\"font-size:18pt;background-color:red;\">"); base.RenderFieldForDisplay(output); output.Write("</span>"); } 2. Find a Post-it note, and write the following message: Never, ever hire Bj rn Furuknap as a designer. 3. Glue the Post-it note to your monitor. In fact, engrave your monitor with the message. 4. Build your solution and deploy. Once deployed, run IISRESET to make sure your assembly is reloaded. 5. Observe the changes to your display form. Or check mine, in Figure 11-5.
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Figure 11-5. If this were a full-color book, you would see a red background. Remember that about never hiring me as a designer.
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With that massive undertaking out of the way, we should stop for a moment and think about what we have done. Overriding the RenderFieldForDisplay is the first available method for changing the rendering of a field. Because this is .NET code only, you have full control over exactly what you do, which is a level of control that is sometimes necessary if you need to do complex operations. The sample you just made can hardly be considered a complex operation; in fact, all you do is surround the parent s RenderFieldForDisplay method with a simple span tag to modify the display style. As I said, it s for illustrative purposes; I m not a designer. However, sometimes we cannot afford ourselves complete control over rendering in code. For example, if you are smart enough to hire a good designer, he or she might not be allowed or even capable of writing .NET code. This is where creating an ASP .NET user control and using that as the rendering mechanism makes sense. Let s take a look, shall we
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