WebService synchronous invocation, asynchronous invocation

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　　One: Add WebService Service

Two: Add "client program" (here with WinForm) to invoke the WebService service

Three: Asynchronous call procedure explanation

One: Add WebService service

1, add an empty website project, 2, add a WebService service (webservicetest.asmx) in the project, 3, add "HelloWorld" method

Code: (webservicetest.asmx)

usingSystem;usingSystem.Collections.Generic;usingSystem.Linq;usingSystem.Threading;usingsystem.web;usingSystem.Web.Services;namespacet1_webservice{/// <summary>    ///Summary description of WebServiceTest/// </summary>[WebService (Namespace ="http://tempuri.org/")] [WebServiceBinding (ConformsTo=Wsiprofiles.basicprofile1_1)] [System.ComponentModel.ToolboxItem (false)]    //To allow this Web service to be called from a script using ASP. NET AJAX, uncomment the following line. //[System.Web.Script.Services.ScriptService]     Public classWebServiceTest:System.Web.Services.WebService {[WebMethod] Public stringHelloWorld (intAintb) {//wait 5 secondsThread.Sleep ( the); return(A +b).        ToString (); }    }}

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Two: Add "client program" (here with WinForm) to invoke the WebService service

1. Add a WinForm project.

2. Add "Referral Service (WebService service)"

3. Add a WinForm form

　　

4. The code to write the call in Btnadd is as follows

        Private voidButton1_Click (Objectsender, EventArgs e) {servicereferencetest.webservicetestsoapclient Client=Newservicereferencetest.webservicetestsoapclient (); intA =int.            Parse (Tbxa.text); intb =int.            Parse (Tbxb.text); //Synchronous Invocation//tbxresult.text = client.            HelloWorld (A, b); //The following is an asynchronous call//Registering callback EventsClient. helloworldcompleted + =client_helloworldcompleted; //Calling Async Methodsclient.                    Helloworldasync (A, b); }        voidClient_helloworldcompleted (Objectsender, Servicereferencetest.helloworldcompletedeventargs e) {            //callback Event Trigger, return resultTbxresult.text =E.result; }

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PS: There are synchronous calls (commented out) and asynchronous calls.

When calling the WebService service for a long time, you can use asynchronous calls to do the main thread without the card.

WebService synchronous invocation, asynchronous invocation