HttpClient & SOAP (C#)

Question

I'm trying to use the HttpClient class to send a SOAP message:

Doing so with REST seems easy (code from here) :

using System; using System.Net.Http; using System.Json;  namespace ConsoleApplication39 { class Program { static void Main(string[] args) {  HttpClient proxy = new HttpClient(); proxy.GetAsync("http://localhost:14892/api/Bloggers").ContinueWith((r) => { HttpResponseMessage response = r.Result; response.Content.ReadAsAsync<JsonArray>().ContinueWith( (a)=> { foreach(var w in a.Result) { Console.WriteLine(w.ValueOrDefault("Name").ToString()); Console.WriteLine(w.ValueOrDefault("Intrest").ToString()); } });  });  Console.ReadKey(true);  }  } } 

I would like to do something similar with SOAP.

I have the host (http://opensearch.addi.dk/2.2/) and the SOAP message to POST:

<?xml version="1.0" encoding="UTF-8"?> <SOAP-ENV:Envelope xmlns:SOAP-ENV="http://schemas.xmlsoap.org/soap/envelope/" xmlns:ns1="http://oss.dbc.dk/ns/opensearch">   <SOAP-ENV:Body>     <ns1:searchRequest>       <ns1:query>dc.title=zorro AND dc.type=bog</ns1:query>       <ns1:agency>100200</ns1:agency>       <ns1:profile>test</ns1:profile>       <ns1:start>1</ns1:start>       <ns1:stepValue>10</ns1:stepValue>     </ns1:searchRequest>   </SOAP-ENV:Body> </SOAP-ENV:Envelope> 

... but how to send it ?

I'll admit that this is the first SOAP Web Service I have ever used so I may have no idea what I'm doing, but in its simplest form could it be something like :

HttpClient hc = new HttpClient(); hc.BaseAddress = new Uri("http://opensearch.addi.dk/2.2/");      HttpContent content = *... something*      HttpResponseMessage rm = await hc.PostAsync("http://opensearch.addi.dk/2.2/", content); 

I assume that the SOAP message should somehow be created through a HttpContent static method like HttpContent.Create(..) but I can't get that to work ...

I know this is a dumb question but I still need help :) !

tia ...

Answer 1

I needed to do this myself and since I couldn't find any answers online, here's what I worked out. This uses a simple SOAP calculator service with an 'Add' method that takes two numbers and returns the sum.

public async Task<int> AddNumbersAsync(Uri uri, int a, int b) {     var soapString = this.ConstructSoapRequest(a, b);     using (var client = new HttpClient())     {         client.DefaultRequestHeaders.Add("SOAPAction", "http://CalculatorService/ICalculatorService/Add");         var content = new StringContent(soapString, Encoding.UTF8, "text/xml");         using (var response = await client.PostAsync(uri, content))         {             var soapResponse = await response.Content.ReadAsStringAsync();             return this.ParseSoapResponse(soapResponse);         }     } }  private string ConstructSoapRequest(int a, int b) {     return String.Format(@"<?xml version=""1.0"" encoding=""utf-8""?>     <s:Envelope xmlns:s=""http://schemas.xmlsoap.org/soap/envelope/"">         <s:Body>             <Add xmlns=""http://CalculatorService/"">                 <a>{0}</a>                 <b>{1}</b>             </Add>         </s:Body>     </s:Envelope>", a, b); }  private int ParseSoapResponse(string response) {     var soap = XDocument.Parse(response);     XNamespace ns = "http://CalculatorService/";     var result = soap.Descendants(ns + "AddResponse").First().Element(ns + "AddResult").Value;     return Int32.Parse(result); }