指示 XmlWriterSettings 使用自闭合标记

本文关键字:自闭 XmlWriterSettings 指示 | 更新日期: 2023-09-27 18:30:23

我正在使用XmlWriterSettings将Xml写入文件。我有只有属性的元素,没有子元素。我希望它们输出为:

<element a="1" /> 

而不是

<element a="1"></element>

我可以用 XmlWriterSettings 来做吗?

编辑:

代码如下:

private void Mission_Save(string fileName)
    {
        StreamWriter streamWriter = new StreamWriter(fileName, false);
        streamWriter.Write(Mission_ToXml());
        streamWriter.Close();
        streamWriter.Dispose();
        _MissionFilePath = fileName;
    }
private string Mission_ToXml()
    {
        XmlDocument xDoc;
        XmlElement root;
        XmlAttribute xAtt;
        xDoc = new XmlDocument();
        foreach (string item in _MissionCommentsBefore)
            xDoc.AppendChild(xDoc.CreateComment(item));
        root = xDoc.CreateElement("mission_data");
        xAtt = xDoc.CreateAttribute("version");
        xAtt.Value = "1.61";
        root.Attributes.Append(xAtt); 
        xDoc.AppendChild(root);
        //Out the xml's!
        foreach (TreeNode node in _FM_tve_Mission.Nodes)
            Mission_ToXml_private_RecursivelyOut(root, xDoc, node);
        foreach (string item in _MissionCommentsAfter)
            xDoc.AppendChild(xDoc.CreateComment(item));

        //Make this look good
        StringBuilder sb = new StringBuilder();
        XmlWriterSettings settings = new XmlWriterSettings();
        settings.Indent = true;
        settings.IndentChars = "  ";
        settings.NewLineChars = "'r'n";
        settings.NewLineHandling = NewLineHandling.Replace;
        settings.OmitXmlDeclaration = true;
        using (XmlWriter writer = XmlWriter.Create(sb, settings))
        {
            xDoc.Save(writer);
        }
        return sb.ToString();
    }
private void Mission_ToXml_private_RecursivelyOut(XmlNode root, XmlDocument xDoc, TreeNode tNode)
    {
        root.AppendChild(((MissionNode)tNode.Tag).ToXml(xDoc));
        foreach (TreeNode node in tNode.Nodes)
            Mission_ToXml_private_RecursivelyOut(root, xDoc, node);
    }

这里_FM_tve_Mission是一个具有节点的 TreeView 控件,每个节点都有一个类 MissionNode 的标记,该方法具有 ToXml 方法,该方法返回包含此 MissionNode 转换为 xml 的 XmlNode

指示 XmlWriterSettings 使用自闭合标记

您不需要任何特殊设置:

XmlWriter output = XmlWriter.Create(filepath);
 output.writeStartElement("element");
 output.writeAttributeString("a", "1");
 output.writeEndElement();

这将为您提供<element a="1" />的输出(刚刚在我正在为其编写 xml 的应用程序中对其进行了测试)

基本上,如果您在编写结束元素之前不添加任何数据,它只会为您关闭它。

我还有以下XmlWriterSettings如果默认情况下它不起作用,它可能是其中之一:

XmlWriterSettings wSettings = new XmlWriterSettings();
wSettings.Indent = true;
wSettings.ConformanceLevel = ConformanceLevel.Fragment;
wSettings.OmitXmlDeclaration = true;
XmlWriter output = XmlWriter.Create(filePathXml, wSettings);

处理来自外部文件的 XML,我编写了以下类来摆脱非空闭合元素。我的 XML 现在具有自结束标记。

using System.Linq;
using System.Xml.Linq;
namespace XmlBeautifier
{
    public class XmlBeautifier
    {
        public static string BeautifyXml(string outerXml)
        {
            var _elementOriginalXml = XElement.Parse(outerXml);
            var _beautifiedXml = CloneElement(_elementOriginalXml);
            return _beautifiedXml.ToString();
        }
        public static XElement CloneElement(XElement element)
        {
            // http://blogs.msdn.com/b/ericwhite/archive/2009/07/08/empty-elements-and-self-closing-tags.aspx
            return new XElement(element.Name,
                element.Attributes(),
                element.Nodes().Select(n =>
                {
                    XElement e = n as XElement;
                    if (e != null)
                        return CloneElement(e);
                    return n;
                })
            );
        }
    }
}

使用正则表达式和递归方法,很容易完成:

    using System.Xml.Linq;
    public static class Xml
    {
        /// <summary>
        /// Recursive method to shorten all xml end tags starting from a given element, and running through all sub elements 
        /// </summary>
        /// <param name="elem">Starting point element</param>
        public static void ToShortEndTags(this XElement elem)
        {
            if (elem == null) return;
            if (elem.HasElements)
            {
                foreach (var item in elem.Elements()) ToShortEndTags(item);
                return;
            }
            var reduced = Regex.Replace(elem.ToString(), ">[''s''n''r]*</''w+>", "/>");
            elem.ReplaceWith(XElement.Parse(reduced));
        }
    }

要使用它,请键入如下内容:

    var path = @"C:'SomeFile.xml";
    var xdoc = XDocument.Load(path).Root.ToShortEndTags();

xdoc现在是从给定路径加载XDocument的实例,但其所有符合条件的(没有内容)完整结束标签现在都缩短了