How to post SOAP Request from .NET?

Question

I have the SOAP request in an XML file. I want to post the request to the web service in .net How to implement?

Answer 1

var uri = new Uri("http://localhost/SOAP/SOAPSMS.asmx/add");

var req = (HttpWebRequest) WebRequest.CreateDefault(uri); 
req.ContentType = "text/xml; charset=utf-8"; 
req.Method = "POST"; 
req.Accept = "text/xml"; 
req.Headers.Add("SOAPAction", "http://localhost/SOAP/SOAPSMS.asmx/add"); 

var strSoapMessage = @"<?xml version='1.0' encoding='utf-8'?>
<soap:Envelope xmlns:soap='http://schemas.xmlsoap.org/soap/envelope/' 
               xmlns:xsi='http://www.w3.org/2001/XMLSchema-instance' 
               xmlns:xsd='http://www.w3.org/2001/XMLSchema'>
  <soap:Body><add xmlns='http://tempuri.org/'><a>23</a><b>5</b></soap:Body>
</soap:Envelope>"; 

using (var stream = new StreamWriter(req.GetRequestStream(), Encoding.UTF8)) 
    stream.Write(strSoapMessage); 

Answer 2

I've done something like this, building an xml request manually and then using the webrequest object to submit the request:

string data = "the xml document to submit";
string url = "the webservice url";
string response = "the response from the server";

// build request objects to pass the data/xml to the server
byte[] buffer = Encoding.ASCII.GetBytes(data);
HttpWebRequest request = WebRequest.Create(url) as HttpWebRequest;
request.Method = "POST";
request.ContentType = "application/x-www-form-urlencoded";
request.ContentLength = buffer.Length;
Stream post = request.GetRequestStream();

// post data and close connection
post.Write(buffer, 0, buffer.Length);
post.Close();

// build response object
HttpWebResponse response = request.GetResponse() as HttpWebResponse;
Stream responsedata = response.GetResponseStream();
StreamReader responsereader = new StreamReader(responsedata);
response = responsereader.ReadToEnd();

The string variables at the start of the code are what you set, then you get a string response (hopefully...) from the server.

Answer 3

This isn't the normal way. Usually you would use WCF or the older style web service reference to generate a proxy client for you.

However, what you need to do generally is use HttpWebRequest to connect to the URL and then send the XML in the body of the request.

Answer 4

I'm wondering how's the XML generated and is it a valid SOAP message? You can post it via HTTP as suggested by the folks above.

If you want to test if that's going to work, you can give SoapUI a try (for testing I mean).

Answer 5

Here's another example--this one in VB:

    Dim manualWebClient As New System.Net.WebClient()

    manualWebClient.Headers.Add("Content-Type", "application/soap+xml;  charset=utf-8")

    ' Note: don't put the <?xml... tag in--otherwise it will blow up with a 500 internal error message!
    Dim bytArguments As Byte() = System.Text.Encoding.ASCII.GetBytes( _
        "<soap12:Envelope xmlns:xsi=""http://www.w3.org/2001/XMLSchema-instance"" xmlns:xsd=""http://www.w3.org/2001/XMLSchema"" xmlns:soap12=""http://www.w3.org/2003/05/soap-envelope"">" & System.Environment.NewLine & _
        "  <soap12:Body>" & System.Environment.NewLine & _
        "    <Multiply xmlns=""http://cptr446.class/"">" & System.Environment.NewLine & _
        "      <x>5</x>" & System.Environment.NewLine & _
        "      <y>4</y>" & System.Environment.NewLine & _
        "    </Multiply>" & System.Environment.NewLine & _
        "  </soap12:Body>" & System.Environment.NewLine & _
        "</soap12:Envelope>")
    Dim bytRetData As Byte() = manualWebClient.UploadData("http://localhost/CPTR446.asmx", "POST", bytArguments)

    MessageBox.Show(System.Text.Encoding.ASCII.GetString(bytRetData))

Answer 6

Sorry for bumping an old thread here's my solution to this

''' <summary>
''' Sends SOAP to a web service and sends back the XML it got back.
''' </summary>
Public Class SoapDispenser
    Public Shared Function CallWebService(ByVal WebserviceURL As String, ByVal SOAP As String) As XmlDocument
        Using wc As New WebClient()
            Dim retXMLDoc As New XmlDocument()

            wc.Headers.Add("Content-Type", "application/soap+xml; charset=utf-8")
            retXMLDoc.LoadXml(wc.UploadString(WebserviceURL, SOAP))

            Return retXMLDoc
        End Using
    End Function
End Class

Answer 7

You need to post the data over HTTP. Use the WebRequest class to post the data. You will need to send other data with the post request to ensure you have a valid SOAP envelope. Read the SOAP spec for all of the details.