Invoking an ASP.NET web service method via an http request

I want to invoke an ASP.NET web service via an http POST request using C# (i.e. I don’t want to use the SoapHttpClientProtocol object generated by running wsdl.exe).

As far as I can tell, the process involves:

creating an HttpWebRequest object which points to the url/method of the web service, with the method;
Creating a SOAP xml envelope;
Serialising any parameters I want to pass to the web method using an XmlSerializer;
Making the request, and parsing the response.

I would like to do this without having to copy and use generated code.

(1) seems pretty straightforward;

(2) I don’t know if the envelope here is standard, or how it should change depending on the webservice method I am calling. I guess I might need to add custom soap headers if required by the service?

(3) What is the process of doing this? I assume that I need to do something like this:

MyClass myObj;
XmlSerializer ser = new XmlSerializer(myObj.GetType());
TextWriter writer = new StringWriter();
ser.Serialize(writer, myObj);
string soapXml = writer.ToString();
writer.Close();

Also, I guess I should add the soapXml to the soap:Body element

(4) I believe I should extract and deserialize the contents of the soap:Body element as well. Is it OK to use the reverse of the process in (3)?

Thanks,

Contents hide

Answers:

Method 1

Answers:

Thank you for visiting the Q&A section on Magenaut. Please note that all the answers may not help you solve the issue immediately. So please treat them as advisements. If you found the post helpful (or not), leave a comment & I’ll get back to you as soon as possible.

Method 1

I don’t know why I am doing this but here’s an example of invoking a web service manually. Please promise to never use this in a production code.

Suppose you had the following SOAP service:

public class Foo
{
    public int Id { get; set; }
    public string Name { get; set; }
}

[WebService(Namespace = "http://tempuri.org/")]
[WebServiceBinding(ConformsTo = WsiProfiles.BasicProfile1_1)]
public class Service1 : System.Web.Services.WebService
{
    [WebMethod]
    public string HelloWorld(Foo foo)
    {
        return "Hello World";
    }
}

You can invoke it manually like this:

class Program
{
    static void Main(string[] args)
    {
        using (WebClient client = new WebClient())
        {
            client.Headers.Add("SOAPAction", ""http://tempuri.org/HelloWorld"");
            client.Headers.Add("Content-Type", "text/xml; charset=utf-8");
            var payload = @"<?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><HelloWorld xmlns=""http://tempuri.org/""><foo><Id>1</Id><Name>Bar</Name></foo></HelloWorld></soap:Body></soap:Envelope>";
            var data = Encoding.UTF8.GetBytes(payload);
            var result = client.UploadData("http://localhost:1475/Service1.asmx", data);
            Console.WriteLine(Encoding.Default.GetString(result));
        }
    }
}

All methods was sourced from stackoverflow.com or stackexchange.com, is licensed under cc by-sa 2.5, cc by-sa 3.0 and cc by-sa 4.0

0 0 votes

Article Rating