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How to Send and Receive SOAP Requests in C#?

Jan 24, 2025 am 06:36 AM

How to Send and Receive SOAP Requests in C#?

Send and receive SOAP requests using C#

This article describes how to create a C# client (developed as a Windows service) that sends a SOAP request to a web service and waits for the corresponding response.

Detailed code explanation

The following code example shows how to create a SOAP request and its corresponding response:

using System.Xml;
using System.Net;
using System.IO;

public static void CallWebService()
{
    string url = "http://xxxxxxxxx/Service1.asmx";
    string action = "http://xxxxxxxx/Service1.asmx?op=HelloWorld";

    XmlDocument soapEnvelopeXml = CreateSoapEnvelope();
    HttpWebRequest webRequest = CreateWebRequest(url, action);
    InsertSoapEnvelopeIntoWebRequest(soapEnvelopeXml, webRequest);

    webRequest.BeginGetResponse(null, null).AsyncWaitHandle.WaitOne(); // 开始异步调用 Web 请求。

    string soapResult;
    using (WebResponse webResponse = webRequest.EndGetResponse(asyncResult))
    {
        using (StreamReader rd = new StreamReader(webResponse.GetResponseStream()))
        {
            soapResult = rd.ReadToEnd();
        }
        Console.Write(soapResult);
    }
}

private static HttpWebRequest CreateWebRequest(string url, string action)
{
    HttpWebRequest webRequest = (HttpWebRequest)WebRequest.Create(url);
    webRequest.Headers.Add("SOAPAction", action);
    webRequest.ContentType = "text/xml;charset=\"utf-8\"";
    webRequest.Accept = "text/xml";
    webRequest.Method = "POST";
    return webRequest;
}

private static XmlDocument CreateSoapEnvelope()
{
    XmlDocument soapEnvelopeDocument = new XmlDocument();
    soapEnvelopeDocument.LoadXml(
    //... (XML 定义已省略)
    return soapEnvelopeDocument;
}

private static void InsertSoapEnvelopeIntoWebRequest(XmlDocument soapEnvelopeXml, HttpWebRequest webRequest)
{
    using (Stream stream = webRequest.GetRequestStream())
    {
        soapEnvelopeXml.Save(stream);
    }
}
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In this example:

  • CreateSoapEnvelope() Creates the requested SOAP envelope.
  • CreateWebRequest() Set up web requests with appropriate headers and configuration.
  • InsertSoapEnvelopeIntoWebRequest() Insert a SOAP envelope into the request.
  • BeginGetResponse() and EndGetResponse() are used for asynchronous SOAP request handling.

Another implementation suggestion

Another common approach involves using the WebRequest and WebResponse classes:

protected virtual WebRequest CreateRequest(ISoapMessage soapMessage)
{
    WebRequest wr = WebRequest.Create(soapMessage.Uri);
    wr.ContentType = "text/xml;charset=utf-8";
    wr.ContentLength = soapMessage.ContentXml.Length;

    wr.Headers.Add("SOAPAction", soapMessage.SoapAction);
    wr.Credentials = soapMessage.Credentials;
    wr.Method = "POST";
    wr.GetRequestStream().Write(Encoding.UTF8.GetBytes(soapMessage.ContentXml), 0, soapMessage.ContentXml.Length);

    return wr;
}

public interface ISoapMessage
{
    string Uri { get; }
    string ContentXml { get; }
    string SoapAction { get; }
    ICredentials Credentials { get; }
}
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This implementation provides a more direct way to handle SOAP requests.

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