c# create barcode free Some Advice on Custom Field Types in Font

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Some Advice on Custom Field Types
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Before we move on to the next topic of this chapter, columns, I would like to share with you some general tips and some small cool ideas you may want to explore.
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CHAPTER 11 STARTING FIELD
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I need to tell you about this, because it took me literally hours figuring this one out the first time it happened. If, by chance, you happen to make a mistake with your rendering template, for example by adding the wrong ID or removing the TextBox, you get an error message stating that you need to check your "TextField" rendering template. Figure 11-7 shows this error message.
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Figure 11-7. Error in error message This, however, is not entirely accurate, since you may have created your own rendering template. The reason why "TextField" is used, however, is that you are inheriting the CreateChildControls from the parent, and the parent has hard-coded the name of its rendering template into the error message.
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Custom DisplayPattern in List Views
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Remember that we discussed render patterns in 9 You may or may not want to edit these patterns for your field type. If you do, you can opt to just override the default DisplayPattern by adding a RenderPattern element to your field type definition: <Field Name="TypeName">TimesType</Field> <RenderPattern Name="DisplayPattern"> <HTML><![CDATA[<span style="font-size:large;color:red;">]]></HTML> <Column/> <HTML><![CDATA[</span>]]></HTML> </RenderPattern> </FieldType> However, you will quickly find that you get no IntelliSense. I know that being hard-core is sometimes a cool thing, but writing CAML view schema without IntelliSense is just madness. To help out, however, open one of your list templates, and write your code inside a view where the IntelliSense will work and give you plenty of support.
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Custom Field Properties
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Creating custom field types is not really hard once you know the basics like you do now. However, what if you wanted to have a different background color for your display rendering You would need to create a new field type, even if your change is a small one.
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CHAPTER 11 STARTING FIELD
One option to solve this is to use custom field properties. You may have noticed that when you create certain types of columns you get a set of configurable options in the Additional Column Settings section on the Create Column page. Figure 11-8 shows the typical lookup column additional settings.
Figure 11-8. Custom field properties These options may be stored in custom properties on the column itself when you create a new column, and you can use these options to configure your column, increasing the reuse of your class significantly. However, the custom field property handling is riddled by bugs that will make using custom field properties very difficult. There is some good news, though, and again WSPBuilder comes to our rescue. The WSPBuilder project list includes a custom field type item template that includes code to fix most of the problems related to storing custom properties on field types. If you want to create reusable field types, I encourage you to explore the field type template that ships with WSPBuilder. Even if you handle the storage of custom properties, you are still faced with a problem related to deploying site columns with custom properties through features. Where would you add the custom field property values You only have access to the elements Field and RenderPatterns, and neither of these can be used. To solve this, you can use a custom namespace. Although a thorough example is beyond the scope of this book, I ll point you to an online article that explains how to do this: http://www.understandingsharepoint.com/url/10033. With these few tips out of the way, we should move on and actually start using our fancy new field type.
CHAPTER 11 STARTING FIELD
Columns
Now that we have a custom field type up and running, we should put it to work. Our next task will be to create a site column from our field type and see what options we have for working with that column. The site column will be the news article title. Later you will also add more site columns to support the other parts of a news article.
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