Render Empty XML Elements as Parent Elements

2019-03-01 23:02发布

站内问答 / C#
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I have a strange requirement where an application consuming some XML that my application is generating actually needs empty elements to be serialized as parent elements. For example: 

<element foo="bar" />

should be:

<element foo="bar"></element>

I'm not aware of any way that the XmlSerializer allows you to change this. Does anybody know how to accomplish this?

3条回答
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2楼-- · 2019-03-01 23:38

I extended XmlTextWriter so that I could override the WriteEndElement() method, forcing it to call WriteFullEndElement(). This did the trick.

Note: for anybody that saw my question update, please ignore. IE was rendering the XML in the shorthand form. As soon as I opened it in Notepad, I realized everything was working fine.

public class FullEndingXmlTextWriter : XmlTextWriter
{
    public FullEndingXmlTextWriter(TextWriter w)
        : base(w)
    {
    }

    public FullEndingXmlTextWriter(Stream w, Encoding encoding)
        : base(w, encoding)
    {
    }

    public FullEndingXmlTextWriter(string fileName, Encoding encoding)
        : base(fileName, encoding)
    {
    }

    public override void WriteEndElement()
    {
        this.WriteFullEndElement();
    }
}
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乱世女痞
3楼-- · 2019-03-01 23:43

You could solve it with a regular expression, making it a two-pass process.

string xml = "element foo=\"bar\" />"

string pattern = @"<(?<elem>\w+)(?<body>\b.*)/>";
string substitute =  @"<${elem} ${body}></${elem}>";

Regex regex = new Regex(pattern);
string goodresult = regex.Replace(xml, substitute);
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Viruses.
4楼-- · 2019-03-01 23:49

Scott Hanselman wrote a while back an article about stripping out empty elements from XML, and at a glance the code can be used for your purpose with a small alteration to the treatment of empty elements. He also explains why using RegEx is a bad idea.

I am pointing this out, as I don't know of a way to get XmlSerializer to do what you want.

Another possibility, though I don't really know much about WPF is using the XAML serializer - look at the System.Window.Markup namespace documentation.

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