How to Send and Receive SOAP Requests and Responses in C#?

Sending SOAP Requests and Receiving Responses in C

Problem

You need to create a C# client that sends SOAP requests to a web service and receives the responses.

Solution

Here's a code snippet that demonstrates how to achieve this:

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

public static void CallWebService()
{
    // Replace with your SOAP endpoint URL
    var url = "http://example.com/service.asmx";
    // Replace with your SOAP action
    var action = "http://example.com/service.asmx?op=HelloWorld";

    var soapEnvelope = CreateSoapEnvelope();
    var webRequest = CreateWebRequest(url, action);
    InsertSoapEnvelopeIntoWebRequest(soapEnvelope, webRequest);

    // Send the SOAP request
    var asyncResult = webRequest.BeginGetResponse(null, null);
    asyncResult.AsyncWaitHandle.WaitOne();

    // Receive the SOAP response
    var soapResponse = "";
    using (var webResponse = webRequest.EndGetResponse(asyncResult))
    {
        using (var reader = new StreamReader(webResponse.GetResponseStream()))
        {
            soapResponse = reader.ReadToEnd();
        }
    }
}

private static HttpWebRequest CreateWebRequest(string url, string action)
{
    var 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()
{
    var soapEnvelope = new XmlDocument();
    soapEnvelope.LoadXml(
        $@"<SOAP-ENV:Envelope xmlns:SOAP-ENV=""http://schemas.xmlsoap.org/soap/envelope/""
               xmlns:xsi=""http://www.w3.org/1999/XMLSchema-instance"" 
               xmlns:xsd=""http://www.w3.org/1999/XMLSchema"">
          <SOAP-ENV:Body>
            <HelloWorld xmlns=""http://tempuri.org/""
                SOAP-ENV:encodingStyle=""http://schemas.xmlsoap.org/soap/encoding/"">
                <int1 xsi:type=""xsd:integer"">12</int1>
                <int2 xsi:type=""xsd:integer"">32</int2>
            </HelloWorld>
          </SOAP-ENV:Body>
        </SOAP-ENV:Envelope>");
    return soapEnvelope;
}

private static void InsertSoapEnvelopeIntoWebRequest(XmlDocument soapEnvelope, HttpWebRequest webRequest)
{
    using (var stream = webRequest.GetRequestStream())
    {
        soapEnvelope.Save(stream);
    }
}

This code creates a web request, sets the SOAP action header, and inserts the SOAP envelope into the request. It then sends the request and reads the SOAP response.

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