如何在创建XML文件时添加命名空间？

Question

我必须在C＃中创建一个XML文档。

根元素必须如下所示：

<valuation-request 
     xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" 
     xsi:noNamespaceSchemaLocation="valuations.xsd">

我正在使用以下

XmlElement root = X.CreateElement("valuation-request");
root.SetAttribute("xmlns:xsi", "http://www.w3.org/2001/XMLSchema-instance");
root.SetAttribute("xsi:noNamespaceSchemaLocation", "valuations.xsd");

然而这会产生

<valuation-request 
     xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" 
     noNamespaceSchemaLocation="valuations.xsd"> //missing the xsi:

我错过了什么？

Answer 1

使用SetAttribute的重载，它也会占用命名空间：

root.SetAttribute("noNamespaceSchemaLocation", 
    "http://www.w3.org/2001/XMLSchema-instance", 
    "valuations.xsd"
); 

Answer 2

最近，我遇到了同样的问题。要解决它，我只需添加以下行：

XmlAttribute noNamespaceSchemaLocationAttr = xmlDoc.CreateAttribute("xsi", "noNamespaceSchemaLocation", "http://www.w3.org/2001/XMLSchema-instance");

Answer 3

使用编写器，您可以这样添加：

var writerSettings = new XmlWriterSettings
        {
            Indent = true,
            IndentChars = " ",
            NewLineChars = Environment.NewLine,
            NewLineHandling = NewLineHandling.Replace,
            Encoding = new UTF8Encoding(false)
        };

XmlWriter writer = XmlWriter.Create("C:\test.xml", writerSettings);
writer.WriteStartDocument(false);
writer.WriteStartElement("valuation-request");
writer.WriteAttributeString("xmlns", "xsi", null, "http://www.w3.org/2001/XMLSchema-instance");
writer.WriteAttributeString("xsi", "noNamespaceSchemaLocation", null, "http://www.gzs.si/e-poslovanje/sheme/eSLOG_1-5_EnostavniRacun.xsd");