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Table 11-1 lists all the possible values.
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The really powerful thing here is that you can create these field types yourself to create your very specific custom type of data, including the visual appearance, storage, validation, and other behavior. In short, the custom development of field types is exceptionally powerful as a customization technique. We will try this in 11. To create a custom field type, you need to do two things, and you should do a few more. The absolute requirements are to have a field type definition, which is CAML, and to have a field type class, which is .NET code. Now, if there are still some nonprogrammers reading the book at this point, you might feel a bit relieved to know that although a field type class is definitely required, several default classes exist in SharePoint, and you can use them for your custom field type.
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CHAPTER 9 STROLLING THROUGH FIELDS OF GOLD
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Field Types in CAML
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To start (and since we are already in CAML land), we should look at the field type definition first. These definitions handle the process of telling SharePoint how our field type should be treated. The field type definitions are stored in [12]\TEMPLATE\XML and are called fldtypesXXXXX.xml, where XXXXX is anything you like. This works like the webtempXXXXX.xml files you need to make sure your file name is unique, starts with fldtypes, and ends in .xml. Oh, and remember that when you add or edit .xml files, you need to do an IISReset to have the changes picked up by SharePoint. The default or out-of-the-box field types are stored in a file called fldtypes.xml. Open that file now, and let s take a look at the text field type. It should be the second FieldType element.
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Note The requirements for a custom field type are different from the requirements for a built-in field
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type. As such, you will see different elements when exploring the out-of-the-box field types than when you create your own field types.
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The first thing you may notice is that there are only two types of child elements, the Field and RenderPattern elements. There is one additional child element called PropertySchema that is not present in any of the default field types. Although the number of child elements may seem simple, the complexity is hidden in the different use of these two elements. It s hardly a perfect XML implementation, but it s what we get.
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Field
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The Field elements are the most interesting to us at this point, because they define most of the field type properties required to get a field up and running. Each Field element has a Name attribute that defines which property to set, and the value of the Field element defines what value to set to a given property. Here are the Field elements for the Text field type: <Field <Field <Field <Field <Field <Field <Field <Field <Field Name="TypeName">Text</Field> Name="TypeDisplayName">$Resources:core,fldtype_text;</Field> Name="InternalType">Text</Field> Name="FieldTypeClass">Microsoft.SharePoint.SPFieldText</Field> Name="SQLType">nvarchar</Field> Name="FieldTypeClass">Microsoft.SharePoint.SPFieldText</Field> Name="ParentType"></Field> Name="Sortable">TRUE</Field> Name="Filterable">TRUE</Field>
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The TypeName property is required and defines a name used when referencing the field type in code. This is not the displayed name of the field type but rather what you would use in the Type attribute of the Field element when creating columns. See Figure 9-5 for an illustration of how these values map.
CHAPTER 9 STROLLING THROUGH FIELDS OF GOLD
Figure 9-5. TypeName Text used in site column
Note At this point, you might realize that both columns and field type definitions use the element Field.
That s OK; it had me confused for a while too.
Although the TypeName is used only in code, the TypeDisplayName is what you would see when you add a new column. And where the TypeName has strict rules for what is allowed, the TypeDisplayName allows more freedom. Just don t confuse them, and you should be OK. The InternalType property is used only for the out-of-the-box types and refers to the internal base type of a column. When developing your own custom field type, you should never set this value. The FieldTypeClass, however, is much more important. When creating your own custom field type, you would add your five-part strong-named field type class here. Yes, it s five-part, because you need to add the class name before your normal four-part strong name. So, if your assembly is MyCustomField and your field type class is called MyCustomFieldClass, your FieldTypeClass might look like this: <Field Name="FieldTypeClass">MyCustomField.MyCustomFieldType, MyCustomField, Version=1.0.0.0, Culture=neutral, PublicKeyToken=d9d34608fcd1f7a8</Field>
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