C# 通过Soap发送xml内容

我发送的soap请求如下所示：

WebRequest webRequest = WebRequest.Create("http://localhost:55056/myWebService.asmx");
HttpWebRequest httpRequest = (HttpWebRequest)webRequest;
httpRequest.Method = "POST";
httpRequest.ContentType = "text/xml; charset=utf-8";
httpRequest.Accept = "text/xml";
httpRequest.Headers.Add("SOAPAction: http://tempuri.org/myWebMethod");
httpRequest.ProtocolVersion = HttpVersion.Version11;
httpRequest.Credentials = CredentialCache.DefaultCredentials;
Stream requestStream = httpRequest.GetRequestStream();
//Create Stream and Complete Request             
StreamWriter streamWriter = new StreamWriter(requestStream, Encoding.ASCII);
soapRequest.Append("<soap:Body>");
soapRequest.Append("<myWebMethod xmlns=\"http://tempuri.org/\">");
soapRequest.Append("<eventType>myEventType</eventType>");
soapRequest.Append("<eventId><firstNode>myProduct</firstNode></eventId>");
soapRequest.Append("<eventData>myEventData</eventData>");
soapRequest.Append("</myWebMethod>");
soapRequest.Append("</soap:Body>");
streamWriter.Write(soapRequest.ToString());
streamWriter.Close();
//Get the Response    
HttpWebResponse wr = (HttpWebResponse)httpRequest.GetResponse();
StreamReader srd = new StreamReader(wr.GetResponseStream());
string resulXmlFromWebService = srd.ReadToEnd();

如何使我的webmethod接受这个小xml：

<firstNode>myProduct</firstNode>

编辑1：

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谢谢你的重播MarxWright，我已经试过了，但不起作用。我通过将：替换为>；它成功了。但是如果我能在另一边做些改变，那就太好了

我不能100%确定这是否可行，但您可以尝试使用以下功能将消息转换为发送，我相信您可以在另一端读取数据

String sMessage = "<tag>Data</tag>";

String messageFilling = System.Security.SecurityElement.Escape(sMessage);

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我不完全理解你的回答，你能再解释一下吗。如果消息正在到达另一端，并且您需要进行更改，那么您是否可以使用消息的内容再次将其转换回Xml文档？

String sMessage = "<tag>Data</tag>";

String messageFilling = System.Security.SecurityElement.Escape(sMessage);