如何使用c#中的xmlns:soap12、xmlns:xsd和xmlns:xsi在c#中以编程方式构建带有soap的xml？

XmlDocument xmlDoc = new XmlDocument();
xmlDoc.LoadXml("<root/>");

XmlNamespaceManager namespaceManager = new XmlNamespaceManager(xmlDoc.NameTable);
namespaceManager.AddNamespace("soap12", "http://www.w3.org/2003/05/soap-envelope");

XmlElement soapEnvelope = xmlDoc.CreateElement("soap12", "Envelope", "http://www.w3.org/2003/05/soap-envelope");
xmlDoc.AppendChild(soapEnvelope);

XmlElement soapBody = xmlDoc.CreateElement("soap12", "Body", "http://www.w3.org/2003/05/soap-envelope");
soapEnvelope.AppendChild(soapBody);

XmlElement requestElement = xmlDoc.CreateElement("Request");
soapBody.AppendChild(requestElement);

XmlElement dataElement = xmlDoc.CreateElement("Data");
dataElement.InnerText = "Hello, World!";
requestElement.AppendChild(dataElement);

XmlElement schemaElement = xmlDoc.CreateElement("xsd", "schema", "http://www.w3.org/2001/XMLSchema");
xmlDoc.DocumentElement.SetAttribute("xmlns:xsd", "http://www.w3.org/2001/XMLSchema");
soapEnvelope.InsertBefore(schemaElement, soapBody);

XmlElement schemaInstanceElement = xmlDoc.CreateElement("xsd", "schemaInstance", "http://www.w3.org/2001/XMLSchema-instance");
xmlDoc.DocumentElement.SetAttribute("xmlns:xsi", "http://www.w3.org/2001/XMLSchema-instance");
soapEnvelope.InsertBefore(schemaInstanceElement, schemaElement);