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HTML文本编写器到字符串-我是否忽略了某些内容?

asp.net c#

Adam McKee · 技术社区 · 15 年前

也许我这一切都是错的(如果是的话请告诉我),但我的头撞在墙上的东西似乎是一个非常简单的概念。

此呈现覆盖来自用户控件。

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

    // Do something nefarious, yet unrelated with htmlAboutToBeRendered
}

这似乎是一个显而易见的方法,但我似乎找不到它。

有人能帮我解释一下吗?

3 回复 | 直到 15 年前

TheTXI 15 年前

试试这个:

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();

}

Robert Horvick 15 年前

您可以从httptextwriter派生并重写ontagrender、onAttributerender和onStyleRender方法,并在呈现时修改标记。OnTagrender的msdn docs显示了一个示例,其中在呈现期间修改了标记:

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

Mark 15 年前

使用再感染的替代方法:

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();
}

然后,使用字符串和StringBuilder重新创建htmltextWriter是一件简单的事情。

这是我从一个 conversation between Tom Spink and Rotsey 艾格达咖啡馆