C＃.NET - 无法将WSDL附加到SOAP请求

Question

我有以下用C＃编写的程序来使用Web服务。

 class Program
  {
    static void Main(string[] args)
    {
        Program obj = new Program();

        obj.InvokeService(); 
    }
    public HttpWebRequest CreateSOAPWebRequest()
    {

        HttpWebRequest Req =      
         (HttpWebRequest)WebRequest.Create(@"https://MyWebService");

        Req.ContentType = "text/xml;charset=\"utf-8\"";
        Req.Accept = "text/xml";

        Req.Method = "POST";

        return Req;
    }
    public void InvokeService()
    {

        HttpWebRequest request = CreateSOAPWebRequest();

        XmlDocument SOAPReqBody = new XmlDocument();

        SOAPReqBody.LoadXml(@"<?xml version=""1.0"" encoding=""utf-8""?>  
        <soapenv:Envelope xmlns:xsi=""http://www.w3.org/2001/XMLSchema-
            instance"" xmlns:xsd=""http://www.w3.org/2001/XMLSchema"" 
              xmlns:soapenv=""http://schemas.xmlsoap.org/soap/envelope/"" 
              xmlns:soapenc=""http://schemas.xmlsoap.org/soap/encoding/"">
             <soapenv:Header/>
             <soapenv:Body>
                <Content>..... </Content>
             </soapenv:Body>
             </soapenv:Envelope>");


             using (Stream stream = request.GetRequestStream())
             {
                 SOAPReqBody.Save(stream);
             }

             using (WebResponse Serviceres = request.GetResponse())
             {
                    using (StreamReader rd = new 
                StreamReader(Serviceres.GetResponseStream()))
                {

                    var ServiceResult = rd.ReadToEnd();

                    Console.WriteLine(ServiceResult);
                    Console.ReadLine();
                }
              }
           }  
        }

我现在想要将WSDL附加到此soap请求。 我所拥有的是.wsdl文件。我使用“SOAP UI”尝试了这个SOAP请求并且它有效，我收到了响应。 好像我需要在SOAP标头中指定方法，但我无法做到这一点。我只能将.WSDL文件放在项目文件夹中的某个位置。

有人可以帮助我得到正确的答案吗？