如果你需要提供一个复杂的组合用户界面来输入元数据，这时就要添加设计器的支持。换句话说，除此之外没有别的办法来输入你自定义的元数据类型。添加设计器的支持，首先你要创建一个 Editor 作为自定义的类型，一个 Editor 其实就一个继承于 .NET 中的 System
如果你需要提供一个复杂的组合用户界面来输入元数据，这时就要添加设计器的支持。换句话说，除此之外没有别的办法来输入你自定义的元数据类型。添加设计器的支持，首先你要创建一个Editor作为自定义的类型，一个Editor其实就一个继承于.NET 中的System.Drawing.Design.UITypeEditor类的子类。
安装CodeSmith后在，在C:\Program File\CodeSmith\ SampleProjects 文件夹下有很多SampleCustomProperties的工程。例如：DropDownEditorProperty是一个把字符串和布尔类型的值结合在一起的元数据，它提供了一个类DropDownEditorPropertyEditor继承于System.Drawing.Design.UITypeEditor。
[Editor(typeof(CodeSmith.Samples.DropDownEditorPropertyEditor), typeof(System.Drawing.Design.UITypeEditor))]public class DropDownEditorProperty
在使用的时候跟其它的元数据类型是一样，不过别忘记添加对程序集的引用，引用CodeSmith默认的是不认识该类型的。
@ Property Name="DropDownEditorProperty" Type="CodeSmith.Samples.DropDownEditorProperty" Category="Options" Description="This property uses a custom dropdown editor." %>@ Assembly Name="SampleCustomProperties" %>
当用户想要编辑DropDownEditProperty时，单击CodeSmith属性面板将会显示如下的自定义对话框：
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