How do I make XhtmlTextWriter write a newline before an open tag immediately preceeded by a close tag?_问答_开发者

How do I make XhtmlTextWriter write a newline before an open tag immediately preceeded by a close tag?

开发者 https://www.devze.com 2023-02-12 13:58 出处：网络

I\'m using an XhtmlTextWriter to write out some Xtml along the following lines: XhtmlTextWriter writer = // init writer;

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I'm using an XhtmlTextWriter to write out some Xtml along the following lines:

XhtmlTextWriter writer = // init writer;
writer.WriteLineNoTabs(
    "<!DOCTYPE html PUBLIC \"-//W3C//DTD XHTML 1.0 Strict//EN\" \"http://www.w3.org/TR/xhtml1/DTD/xhtml1-strict.dtd\">");
writer.AddAttribute("xmlns", "htt开发者_Python百科p://www.w3.org/1999/xhtml");
writer.AddAttribute("xml:lang", "en");
writer.RenderBeginTag(HtmlTextWriterTag.Html);
writer.RenderBeginTag(HtmlTextWriterTag.Head);

writer.RenderBeginTag(HtmlTextWriterTag.Title);
writer.Write("My Title");
writer.RenderEndTag(); // Title

writer.RenderEndTag(); // Head

writer.RenderBeginTag(HtmlTextWriterTag.Body);


writer.RenderBeginTag(HtmlTextWriterTag.H3);
writer.WriteLine("My Heading", userName);
writer.RenderEndTag(); // H3

writer.RenderBeginTag(HtmlTextWriterTag.H6);
writer.WriteLine("My Sub-heading");
writer.RenderEndTag(); // H6

writer.RenderBeginTag(HtmlTextWriterTag.Hr);
writer.RenderEndTag(); // Hr

writer.RenderBeginTag(HtmlTextWriterTag.P);
writer.WriteLine("Hello World.");
writer.RenderEndTag(); // P

writer.RenderEndTag(); // Body

writer.RenderEndTag(); // Html

What I get in the output is something like the following:

<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Strict//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-strict.dtd">
<html xmlns="http://www.w3.org/1999/xhtml" xml:lang="en">
    <head>
        <title>
            My Title
        </title>
    </head><body>
        <h3>
            My Heading

        </h3><h6>
            My Sub-heading

        </h6><hr /><p>Hello World.
        </p>
    </body>
</html>

While this is valid Xhtml I was expecting a newline between tags like </head> and <body>. I would make the resulting Xhtml easier to read, for one thing.

Is there a way I can get the XtmlTextWriter to do this?

I messed around a bit with overriding RenderAfterTag and similar, but since the lack of newline is only in the case of a close tag followed immediately by an open tag it was not immediately obvious how to implement it.

writer.WriteLine() without args writes a newline character to the output stream

You can extend HtmlTextWriter which wraps RenderEndTag and simply writes a new line every time you call it.

public static class extensions {

    public static void myRenderEndTag (this HtmlTextWriter writer) {
        writer.RenderEndTag();
        writer.WriteLine();
    }

}

Here it is in action with a usable and abbreviated version of your code:

using (var textWriter = File.CreateText("test.txt")) 
using (XhtmlTextWriter writer = new XhtmlTextWriter(textWriter)) {

    writer.RenderBeginTag(HtmlTextWriterTag.Html);
      writer.RenderBeginTag(HtmlTextWriterTag.Head);
        writer.RenderBeginTag(HtmlTextWriterTag.Title);
          writer.Write("My Title");
        writer.myRenderEndTag(); // Title
      writer.myRenderEndTag(); // Head
      writer.RenderBeginTag(HtmlTextWriterTag.Body);
      writer.myRenderEndTag(); // Body
    writer.myRenderEndTag(); // Html

}