C # Use HttpPost to call WebService,

C # Use HttpPost to call WebService,

Previously, WebService was called by directly adding service references and then calling the WebService method. Recently, we found that WebService can be called using Http requests. Here I would like to say that the web api call is simple.

WebService server code:

　　 public class WebServiceDemo : System.Web.Services.WebService    {        [WebMethod]        public string HelloWorld()        {            return "Hello World";        }        [WebMethod]        public string Sum(string param1, string param2)        {            int num1 = Convert.ToInt32(param1);            int num2 = Convert.ToInt32(param2);            int sum = num1 + num2;            return sum.ToString();        }    }

Simple code, just for demonstration.

 

Client call code:

Class Program {static void Main (string [] args) {Program program = new Program (); string url = "http: // localhost: 12544/WebServiceDemo. asmx "; string method =" Sum "; string num1 =" 1 "; string num2 =" 2 "; string result = program. httpPostWebService (url, method, num1, num2); Console. writeLine (result); Console. readKey ();} public string HttpPostWebService (string url, string method, string num1, string num2) {string result = string. empty; string param = string. empty; byte [] bytes = null; Stream writer = null; HttpWebRequest request = null; HttpWebResponse response = null; param = HttpUtility. urlEncode ("param1") + "=" + HttpUtility. urlEncode (num1) + "&" + HttpUtility. urlEncode ("param2") + "=" + HttpUtility. urlEncode (num2); bytes = Encoding. UTF8.GetBytes (param); request = (HttpWebRequest) WebRequest. create (url + "/" + method); request. method = "POST"; request. contentType = "application/x-www-form-urlencoded"; request. contentLength = bytes. length; try {writer = request. getRequestStream (); // get the Stream object used to write request data} catch (Exception ex) {return "";} writer. write (bytes, 0, bytes. length); // write the parameter data to the request data stream writer. close (); try {response = (HttpWebResponse) request. getResponse (); // get the response} catch (WebException ex) {return "" ;}# region reads a returned result string Stream stream = response. getResponseStream (); // get the response stream XmlTextReader Reader = new XmlTextReader (stream); Reader. moveToContent (); result = Reader. readInnerXml (); # endregion # This method reads a string in Xml format // StreamReader reader = new StreamReader (response. getResponseStream (), Encoding. UTF8); // result = reader. readToEnd (); # endregion response. dispose (); response. close (); // reader. close (); // reader. dispose (); Reader. dispose (); Reader. close (); stream. dispose (); stream. close (); return result ;}}

The first read method returns the result:

The second read method returns the result:

 

PS: if an error is reported during the call, you can add the following configuration nodes to the web. config configuration of the server (WebService.

　<system.web>    <webServices>      <protocols>        <add name="HttpPost" />      </protocols>    </webServices>  </system.web>

 

Refer:

Http://www.cnblogs.com/caiwenz/p/3910566.html