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Overview:

Create the call to the web service and have it return a set of data or object.

Creating a Post Method

    private XmlDocument CallWebServicePost(string method, string operation, string xmlPayload)
    {
        string result = "";
        string CREDENTIALS = "PASSword123";
        string URL_ADDRESS = "http://web-01:8083/WPAddIn.asmx/GetAllCompanies";
        //string URL_ADDRESS = "http://www.client.com/_ws/" + method + "?sso=" + CREDENTIALS + "&o=" + operation +; //TODO: customize to your needs
        // ===== You shoudn't need to edit the lines below =====

        // Create the web request
        HttpWebRequest request = WebRequest.Create(new Uri(URL_ADDRESS)) as HttpWebRequest;

        // Set type to POST
        request.Method = "POST";
        request.ContentType = "application/xml";

        // Create the data we want to send
        StringBuilder data = new StringBuilder();
        data.Append(xmlPayload);
        byte[] byteData = Encoding.UTF8.GetBytes(data.ToString()); // Create a byte array of the data we want to send
        request.ContentLength = byteData.Length; // Set the content length in the request headers

        // Write data to request
        using (Stream postStream = request.GetRequestStream())
        {
            postStream.Write(byteData, 0, byteData.Length);
        }

        // Get response and return it
        XmlDocument xmlResult = new XmlDocument();
        try
        {
            using (HttpWebResponse response = request.GetResponse() as HttpWebResponse)
            {
                StreamReader reader = new StreamReader(response.GetResponseStream());
                result = reader.ReadToEnd();
                reader.Close();
            }
            xmlResult.LoadXml(result);
        }
        catch (Exception e)
        {
            var debug = 1;// xmlResult = CreateErrorXML(e.Message, ""); //TODO: returns an XML with the error message
        }
        return xmlResult;
    }

Create a Get Request

   private XmlDocument CallWebServiceGet()
    {
        string result = "";
        string CREDENTIALS = "PASSword123";

        string URL_ADDRESS = "http://lweb-01:8083/WPAddIn.asmx/GetAllCompanies";
        // ===== You shoudn't need to edit the lines below =====

        XmlDocument xmlResult = new XmlDocument();

        //creating the proxy for the service call using the HttpWebRequest class
        HttpWebRequest WebReq = (HttpWebRequest)WebRequest.Create(URL_ADDRESS);

        //Set the method/action type
        WebReq.Method = "GET";

        //We use form contentType
        WebReq.ContentType = "text/xml; charset = utf - 8";
        // WebReq.ContentType = "application/xml";

        //Get the response handle, we have no true response yet!
        HttpWebResponse WebResp = (HttpWebResponse)WebReq.GetResponse();

        //Now, we read the response (the string), and output it.
        Stream MyResponse = WebResp.GetResponseStream();

        //read the stream into streamreader
        StreamReader MyResponseReader = new StreamReader(MyResponse);

        //Loading into XML doc
        //xmlResult = Xml
        XDocument xmlDoc = XDocument.Load(MyResponseReader);

        //read the XML nodes using Linq
        var itemList = from content in xmlDoc.Descendants("item")//node
                       select new
                       {
                           itemName = content.Element("itemName ").Value,
                           categoryName = content.Element("categoryName").Value,
                           itemImage = content.Element("itemImage").Value,
                       };
        return xmlResult;
    }

Resources:

https://swagatblog.wordpress.com/2011/01/09/consume-web-services-dynamically-using-httpwebrequest/

https://code.msdn.microsoft.com/Dynamic-web-service-call-0512a318

www.diogonunes.com/blog/calling-webservice-without-wsdl-or-web-reference/

Tags: WebServices Webservice Web Services