EAP/APM使用方法及案例介绍(2)

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Net;
using System.IO;
namespace AsyncTest1.APM
{
public class APMTestRun1
{
public static void AsyncRun()
{
Utility.Log("APMAsyncRun:start");
//测试网址
string url = "http://sports.163.com/nba/";
HttpWebRequest webRequest = HttpWebRequest.Create(url) as HttpWebRequest;
webRequest.BeginGetResponse(Callback, webRequest);
Utility.Log("AsyncRun:download_start");
}
private static void Callback(IAsyncResult ar)
{
var source = ar.AsyncState as HttpWebRequest;
var response = source.EndGetResponse(ar);
using (var stream = response.GetResponseStream())
{
using (var reader = new StreamReader(stream))
{
string content = reader.ReadToEnd();
Utility.Log("AsyncRun:result_size=" + Utility.GetStrLen(content));
}
}
}
}
}

委托的异步调用也用的是APM模式，这个方式的强大之处，在于可以使任何方法编程异步调用。

复制代码 代码如下:

/// <summary>
/// 一个耗时的方法
/// </summary>
private static void CaluateManyNumber() {
for (int i = 0; i < 10; i++)
{
Thread.Sleep(100);
Console.WriteLine("loop==>"+i.ToString());
}
}
/// <summary>
/// 委托，让耗时方法可以异步执行
/// </summary>
public static void AsyncDelegate() {
//委托简单的包装了一下方法
Action action = CaluateManyNumber;
action.BeginInvoke(DelegateCallback, null);
Console.WriteLine("action begin");
}
/// <summary>
/// 异步回调
/// </summary>
/// <param></param>
private static void DelegateCallback(IAsyncResult ar) {
AsyncResult asyncResult = ar as AsyncResult;
var delegateSource = asyncResult.AsyncDelegate as Action;
delegateSource.EndInvoke(ar);
Console.WriteLine("action end");
}

捕获异常
异常信息要在[End操作名称]中获取。

复制代码 代码如下:

private static void Callback(IAsyncResult ar)
{
var source = ar.AsyncState as HttpWebRequest;
WebResponse response = null;
try
{
response = source.EndGetResponse(ar);
}
catch (Exception ex) {
Utility.Log("error:" + ex.Message);
response = null;
}
if (response != null)
{
using (var stream = response.GetResponseStream())
{
using (var reader = new StreamReader(stream))
{
string content = reader.ReadToEnd();
Utility.Log("AsyncRun:result_size=" + Utility.GetStrLen(content));
}
}
}
}

状态和取消操作、进度报告
APM模式本身不支持状态多样化和取消操作、进度报告。

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