HtmlTextWriter to String - 我可以忽略一些東西嗎？

Question

也許我正在談論這一切都是錯誤的（請告訴我，如果我是），但我正在用一種看起來像一個非常簡單的概念我的頭靠牆。

此渲染覆蓋來自用戶控件。

protected override void Render(HtmlTextWriter writer) 
{ 
    string htmlAboutToBeRendered = writer.GetWhatHasBeenWrittenToTheWriterSoFar(); 

    // Do something nefarious, yet unrelated with htmlAboutToBeRendered 
} 

這似乎是一個會有這樣做一個顯而易見的方式，但我似乎無法找到它。

任何人都可以在這裏爲我介紹一些情況嗎？

Answer 1

試試這個：

protected override void RenderContents(HtmlTextWriter output) 
{ 
    StringBuilder sb = new StringBuilder(); 
    HtmlTextWriter htw = new HtmlTextWriter(new System.IO.StringWriter(sb, 
    System.Globalization.CultureInfo.InvariantCulture)); 
    foreach (Control ctrl in Controls) 
    { 
     ctrl.RenderControl(htw); 
    } 
    string strContents = sb.ToString(); 

}

Answer 2

您可以從HttpTextWriter派生並重寫OnTagRender，OnAttributeRender和OnStyleRender方法和修改標籤，因爲他們被渲染。 MSDN文檔爲OnTagRender顯示在標籤渲染過程中修改樣本：

http://msdn.microsoft.com/en-us/library/system.web.ui.htmltextwriter.ontagrender.aspx

Answer 3

替代方法使用relfection：

private string GetString(HtmlTextWriter writer) 
{ 
    // the flags to see the internal properties of the writer 
    System.Reflection.BindingFlags flags = System.Reflection.BindingFlags.Default; 
    flags |= System.Reflection.BindingFlags.NonPublic; 
    flags |= System.Reflection.BindingFlags.Instance; 
    flags |= System.Reflection.BindingFlags.FlattenHierarchy; 
    flags |= System.Reflection.BindingFlags.Public; 

    // get the information about the internal TextWriter object 
    System.Reflection.FieldInfo baseWriter = writer.GetType().GetField("writer", flags); 

    // use that info to create a StringWriter 
    System.IO.StringWriter reflectedWriter = (System.IO.StringWriter)baseWriter.GetValue(writer); 

    // now we get a StringBuilder! 
    StringBuilder builder = reflectedWriter.GetStringBuilder(); 

    return builder.ToString(); 
} 

然後，它使用重新創建的HtmlTextWriter一個簡單的事情字符串和一個StringBuilder。

這是用一對夫婦的線索，我從一個conversation between Tom Spink and Rotsey上EggheadCafe