如何使用HtmlTextWriter编写html注释？

Question

我使用HtmlTextWriter将html输出到一个流中。然而，我缺少一种编写html注释的方法。当然，我可以编写一个扩展方法来做

public static void WriteComment(this HtmlTextWriter writer, string comment)
{
  writer.Write("<!-- ");
  writer.WriteEncodedText(comment);
  writer.Write(" -->");
}

但这确实让人感觉有点不雅观--是不是有什么我看不到的内置方法？

Answer 1

在检查了specification之后，我可以争辩说，这些扩展可以稍微更正确一些，

public static void WriteBeginComment(this HtmlTextWriter writer)
{
    writer.Write(HtmlTextWriter.TagLeftChar);
    writer.Write("!--");
}

public static void WriteEndComment(this HtmlTextWriter writer)
{
    writer.Write("--");
    writer.Write(HtmlTextWriter.TagRightChar);
}

public static void WriteComment(this HtmlTextWriter writer, string comment)
{
    if (
        comment.StartsWith(">") || 
        comment.StartsWith("->") || 
        comment.Contains("--") ||
        comment.EndsWith("-"))
    {
        throw new ArgumentException(
            "text does not meet HTML5 specification",
            "comment");
    }

    writer.WriteBeginComment();
    writer.Write(comment);
    writer.WriteEndComment();
}