c#设置xml空节点不换行;添加属性为xsi:nil="true"的空节点

1.设置生成xml的内容格式为不换行。

 默认用下面代码创建并生成xml的代码如下:
 XmlDocument doc = new XmlDocument();
 //这里为创建节点等代码,省略....
 //保存
 doc.Save(filename);
如果节点内容是空的,则会换行:
    <UserName>
    </UserName>

这样的话会导致xsd中如果有验证会通不过,要想不换行,doc.Save(filename);可以改为:
 using (XmlTextWriter xtw = new XmlTextWriter(filename, null))
  {
    //None表示不应用特殊格式,另一个相反枚举值Indented表示缩进
    xtw.Formatting = Formatting.None;  
    doc.Save(xtw);
  }

Formatting.None虽然不换行了,但所有的节点挤在一起了。Formatting.Indented空节点还是会换行。


搜索了一下,看到Stack Overflow这里一个提问What is the simplest way to get indented XML with line breaks from XmlDocument?

有个回复代码:

static public string Beautify(XmlDocument doc)
{
    StringBuilder sb = new StringBuilder();
    XmlWriterSettings settings = new XmlWriterSettings();
    settings.Indent = true;
    settings.IndentChars = "  ";
    settings.NewLineChars = "\r\n";
    settings.NewLineHandling = NewLineHandling.Replace;
    using (XmlWriter writer = XmlWriter.Create(sb, settings)) {
        doc.Save(writer);
    }
    return sb.ToString();
}
测试了下,只需要settings.Indent = true;这个属性就可以使空节点不换行了。

 XmlWriterSettings settings = new XmlWriterSettings();
            settings.Indent = true;
            using (XmlWriter writer = XmlWriter.Create(filename, settings))
            {
                doc.Save(writer);
            }
2.添加属性为xsi:nil="true"的空节点

 public static XmlElement CreateNodeWithNullAttr(XmlDocument doc, string nodeName)
        {
            XmlElement element = doc.CreateElement(nodeName);          
            XmlAttribute attr = doc.CreateAttribute("xsi", "nil", "http://www.w3.org/2001/XMLSchema-instance");
            attr.Value = "true";
            element.SetAttributeNode(attr);
            //element.Attributes.Append(attr);
            return element;
        }




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