Question

我希望XML的格式如下：

  <?xml version="1.0" encoding="UTF-8"?>
  <ac:Main xmlns:trip="http://www.test.com/main.xsd"
     xmlns:abc="http://www.test.com/Types.xsd"
     xmlns:tw="http://www.test.com/TW.xsd"
     xmlns:ck="http://www.test.com/CK.xsd"
     xmlns:k1="http://www.test.com/K1.xsd"
     xmlns:d1="http://www.test.com/D1.xsd"
     xmlns:ac="http://www.test.com/Ac.xsd"
     xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
     xsi:schemaLocation="http://www.test.com/Ac.xsd file:/D:/schema/AC.xsd">
        <ac:Records>
            <d1:Header>
           <abc:FirstElement>firstValue</abc:FirstElement>
        </d1:Header>
       </ac:Records>
     </ac:Main>

所以，我使用XmlWriter编写代码如下：

      using (XmlWriter writer = XmlWriter.Create(path, settings))
        {
            writer.WriteStartElement("ac", "Main", "xmlns");
            writer.WriteAttributeString("xmlns", "trip", null,  http://www.test.com/main.xsd");
            writer.WriteAttributeString("xmlns", "abc", null,    http://www.test.com/Types.xsd");
            writer.WriteAttributeString("xmlns", "tw", null, http://www.test.com/TW.xsd");
            writer.WriteAttributeString("xmlns", "kc", null, "http://www.test.com/CK.xsd");
            writer.WriteAttributeString("xmlns", "k1", null, "http://localhost:8080/K1.xsd");
            writer.WriteAttributeString("xmlns", "d1", null, "http://localhost:8080/D1.xsd");                  
            writer.WriteAttributeString("xsi","schemaLocation", "http://www.w3.org/2001/XMLSchema-instance", "http://www.test.com/Ac.xsd file:/D:/schema/AC.xsd");

           // writer.WriteAttributeString("xmlns", "ac", null, "http://www.test.com/Ac.xsd ");

            writer.WriteStartElement("ac", "Records", "xmlns");  
            writer.WriteStartElement("d1", "Header", "xmlns");

            writer.WriteStartElement("abc", "FirstElement", "xmlns");
            writer.WriteString("firstValue");
            writer.WriteEndElement(); 
            writer.WriteEndElement(); 
            writer.WriteEndElement(); 
        }

但是没有注释 writer.WriteAttributeString（“xmlns”，“ac”，null，“http://www.test.com/Ac.xsd”）; 产生错误 “前缀'ac'不能在同一个起始元素标记内从'xmlns'重新定义为'http://www.test.com/Ac.xsd'。”

所以，我按照上面的代码提交了该行，输出为：

 <?xml version="1.0" encoding="utf-8"?>
    <ac:Main 
     xmlns:wctrp="http://www.test.com/main.xsd"
     xmlns:abc="http://www.test.com/Types.xsd"
     xmlns:tw="http://www.test.com/TW.xsd"
     xmlns:ck="http://www.test.com/CK.xsd"
     xmlns:k1="http://www.test.com/K1.xsd"
     xmlns:d1="http://www.test.com/D1.xsd"
     xmlns:ac="http://www.test.com/Ac.xsd"
     xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
     xsi:schemaLocation="http://www.test.com/Ac.xsd file:/D:/schema/AC.xsd" 
     xmlns:ac="xmlns">
      <ac:Records>
            <d1:Header xmlns:hd1="xmlns">
        <abc:FirstElement  xmlns:iaiabc="xmlns">firstValue</abc:FirstElement>
        </d1:Header>
      </ac:Records>
     </ac:Main>

不受欢迎的属性是元素'Main'中的xmlns：ac =“xmlns”， xmlns：'d1：Header'中的hd1 =“xmlns”和
xmlns：'abc：FirstElement'中的iaiabc =“xmlns”。

任何一个人都建议我应该怎么做才能删除不需要的属性并以最顶层的格式获得输出。

我是XmlWriter的新手。

Answer 1

你误用了WriteStartElement。命名空间不应该是xmlns。它应该是您将要使用的实际命名空间。此外，因为在写入属性之前首次出现ac，所以不要包含ac的xmlns属性行。 ac的xmlns属性将由编写器自动生成。

你实际上可以省略所有xmlns属性行，但是命名空间将在它们出现的第一个元素上声明。

    using (XmlWriter writer = XmlWriter.Create(path))
    {
        writer.WriteStartElement("ac", "Main", "http://www.test.com/Ac.xsd");
        writer.WriteAttributeString("xmlns", "trip", null, "http://www.test.com/main.xsd");
        writer.WriteAttributeString("xmlns", "abc", null, "http://www.test.com/Types.xsd");
        writer.WriteAttributeString("xmlns", "tw", null, "http://www.test.com/TW.xsd");
        writer.WriteAttributeString("xmlns", "kc", null, "http://www.test.com/CK.xsd");
        writer.WriteAttributeString("xmlns", "k1", null, "http://localhost:8080/K1.xsd");
        writer.WriteAttributeString("xmlns", "d1", null, "http://localhost:8080/D1.xsd");                  
        writer.WriteAttributeString("xsi","schemaLocation", "http://www.w3.org/2001/XMLSchema-instance", "http://www.test.com/Ac.xsd file:/D:/schema/AC.xsd");

        writer.WriteStartElement("ac", "Records", "http://www.test.com/Ac.xsd");  
        writer.WriteStartElement("d1", "Header", "http://localhost:8080/D1.xsd");

        writer.WriteStartElement("abc", "FirstElement", "http://www.test.com/Types.xsd");
        writer.WriteString("firstValue");
        writer.WriteEndElement(); 
        writer.WriteEndElement(); 
        writer.WriteEndElement(); 
    }

如何在C＃.Net中使用XmlWriter格式化XML？

1 个答案: