Defining content type

SharePoint content type is associated to a model class by an SPContentTypeAttribute attribute. The attribute defined base content type and a unique content type ID.

The following defines a custom content type base on built-in Item content type, named “My Item” and has the content type ID 0x01005A132C01F46341319BBA6C776A2D9D32.

[SPContentType("5A132C01F46341319BBA6C776A2D9D32", "My Item")]
public class MyItem : SPModel {
}

Inheriting other built-in content types is also possible. The following example defines a custom content type base on Document content type with ID 0x010100B74C4D49D7D44B0893B41D0163B8EC6E.

[SPContentType(BuiltInContentTypeIdString.Document, "B74C4D49D7D44B0893B41D0163B8EC6E", "My Document")]
public class MyDocument : SPModel {
}

Note: It is also possible to describe built-in or third-party content types using models. For information see Built-in or third-party content type.

Next you would define columns in the content type.