封装WebService的APM为Async、Await模式利于Asp.Net页面调用

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Wcf针对Async、Await指令直接可以返回Task<T>结果，但是老旧的系统中还是会有很多是在用Soap的Webservice。直接在Asp.Net页面调用APM方法确实比较麻烦，其实可以直接用TaskFactory封装APM模式为.Net4.5的async await模式，便于页面调用。

下面上实现代码，不多废话，注意注释：

using System;

using System.Collections.Generic;

using System.Linq;

using System.Text;

using System.Threading;

using System.Threading.Tasks;

using System.Web;

using System.Web.Services.Protocols;

using System.Web.UI;

using System.Web.UI.WebControls;

namespace WebApplication1

{

    public partial class _Default : Page

    {

        protected async void Page_Load(object sender, EventArgs e)

        {

            //这里不直接用AsyncWebService而用父类SoapHttpClientProtocol的原因是:以后可以针对不同的webservice复用

            SoapHttpClientProtocol soapHttpClient = new global::AsyncWebService("http://localhost:3115/AsyncWebService.asmx");

            //反射创建APM方法异步委托

            var beginFunc = soapHttpClient.GetType()

                .GetMethod("BeginHelloWorld")

                .CreateDelegate(typeof(Func<string, System.AsyncCallback, object, IAsyncResult>), soapHttpClient) as Func<string, System.AsyncCallback, object, IAsyncResult>;

            var endFunc = soapHttpClient.GetType()

                .GetMethod("EndHelloWorld")

                .CreateDelegate(typeof(Func<IAsyncResult, string>), soapHttpClient) as Func<IAsyncResult, string>;

            //打印一下调用异步前线程ID

            StringBuilder sb = new StringBuilder();

            sb.Append("<br />");

            sb.Append("Befort Thread Id:" + Thread.CurrentThread.ManagedThreadId);

            sb.Append("<br />");

            //用TaskFactory封装APM模式为.Net4.5的async await模式

            string result = await Task<string>.Factory.FromAsync<string>(beginFunc,

                endFunc, "zhang san", null);

            //打印一下调用异步后线程ID

            sb.Append("After Thread Id:" + Thread.CurrentThread.ManagedThreadId);

            sb.Append("<br />");

            sb.Append(result);

            ltlResult.Text = sb.ToString();

        }

    }

}