如何添加XML命名空间

Question

这种饲料（它SNIPPIT）需要看起来就像这样：

<AmazonEnvelope xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" 
       xsi:noNamespaceSchemaLocation="amzn-envelope.xsd"> 

我该怎么添加到这个C＃代码添加额外的xmlns，XSI垃圾：

writer.WriteStartDocument(); 
writer.WriteStartElement("AmazonEnvelope"); 

这个消息被拒绝没有它 -

Answer 1

是.NET 3.5的一个选项吗？

XNamespace ns = "http://www.w3.org/2001/XMLSchema-instance"; 

string s = new XElement("AmazonEnvelope", 
    new XAttribute(XNamespace.Xmlns + "xsi", ns), 
    new XAttribute(ns + "noNamespaceSchemaLocation", "amzn-envelope.xsd") 
).ToString(); 

---

或XmlWriter：

const string ns = "http://www.w3.org/2001/XMLSchema-instance"; 
writer.WriteStartDocument(); 
writer.WriteStartElement("AmazonEnvelope"); 
writer.WriteAttributeString("xmlns", "xsi", "", ns); 
writer.WriteAttributeString("xsi", "noNamespaceSchemaLocation", 
     ns, "mzn-envelope.xsd"); 
writer.WriteEndDocument(); 

Answer 2

试试这个：

writer.WriteStartElement("AmazonEnvelope"); 
writer.WriteAttributeString(
    "xmlns", "xsi", null, "http://www.w3.org/2001/XMLSchema-instance"); 
writer.WriteAttributeString(
    "xsi", "noNamespaceSchemaLocation", null, "amzn-envelope.xsd"); 
... 
writer.WriteEndElement();