未能将“<var>X</var>”的实例用作 HtmlTextWriter。请确保指定的类可以实例化，扩展 System.Web.UI.HtmlTextWriter，并用类型 System.IO.TextWriter 的单个参数实现一个构造函数。

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An instance of '<var>X</var>' could not be used as an HtmlTextWriter. Make sure the specified class can be instantiated, extends System.Web.UI.HtmlTextWriter, and implements a constructor with a single parameter of type System.IO.TextWriter.

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