一个例子形象的理解协程和线程的区别 - ToB企服应用市场:ToB评测及商务社交产业平台

/// <summary>
/// 测试接口
/// </summary>
[RoutePrefix("api/test")]
public class TestController : ApiController
{
/// <summary>
/// 测试GET请求
/// </summary>
/// <param name="val">测试参数</param>
[HttpGet]
[Route("TestGet")]
public HttpResponseMessage TestGet(string val)
{
Thread.Sleep(200); //模拟执行耗时操作
return new HttpResponseMessage { Content = new StringContent(val.ToString(), Encoding.UTF8, "text/plain") };
}
}

复制代码

using System;
using System.Collections.Generic;
using System.Diagnostics;
using System.Linq;
using System.Text;
using System.Threading;
using System.Threading.Tasks;
using System.Windows.Forms;
using Utils;
namespace AsyncDemo2
{
public partial class Form1 : Form
{
private int n = 200;
public Form1()
{
InitializeComponent();
Task.Factory.StartNew(() =>
{
while (true)
{
Thread.Sleep(100);
ThreadPool.GetMaxThreads(out int w1, out int c1);
ThreadPool.GetAvailableThreads(out int w2, out int c2);
int w = w1 - w2;
int c = c1 - c2;
label1.BeginInvoke(new Action(() =>
{
label1.Text = string.Format("工作线程：{0} 异步线程：{1}", w, c);
}));
}
}, TaskCreationOptions.LongRunning);
}
/// <summary>
/// 日志输出
/// </summary>
private void Log(string msg)
{
this.BeginInvoke(new Action(() =>
{
textBox1.AppendText(DateTime.Now.ToString("mm:ss.fff") + "：" + msg + "\r\n");
}));
}
/// <summary>
/// 异步请求
/// </summary>
private async Task ReqeustAsync(int val)
{
try
{
Log("异步开始请求" + val);
string result = await HttpUtil.HttpGetAsync("http://localhost:8500/api/test/TestGet?val=" + val);
Log("异步返回数据" + result + " 线程ID：" + Thread.CurrentThread.ManagedThreadId);
}
catch (Exception ex)
{
Log("出错：" + ex.Message);
}
}
/// <summary>
/// 在线程中同步请求
/// </summary>
private Task Request(int val)
{
return Task.Run(() =>
{
try
{
Log("同步多线程开始请求" + val);
string result = HttpUtil.HttpGet("http://localhost:8500/api/test/TestGet?val=" + val);
Log("同步多线程返回数据" + result + " 线程ID：" + Thread.CurrentThread.ManagedThreadId);
}
catch (Exception ex)
{
Log("出错：" + ex.Message);
}
});
}
//测试异步请求
private async void button3_Click(object sender, EventArgs e)
{
textBox1.Text = string.Empty;
Stopwatch sw = new Stopwatch();
List<Task> taskList = new List<Task>();
sw.Start();
for (int i = 0; i < n; i++)
{
Task t = ReqeustAsync(i);
taskList.Add(t);
}
foreach (Task t in taskList)
{
await t;
}
Log(n + "个异步请求完成，耗时：" + sw.Elapsed.TotalSeconds.ToString("0.000"));
sw.Stop();
}
//测试多线程同步请求
private void button4_Click(object sender, EventArgs e)
{
textBox1.Text = string.Empty;
Task.Run(() =>
{
List<Task> taskList = new List<Task>();
Stopwatch sw = new Stopwatch();
sw.Start();
for (int i = 0; i < n; i++)
{
Task t = Request(i);
taskList.Add(t);
}
Task.WaitAll(taskList.ToArray());
Log(n + "个多线程同步请求完成，耗时：" + sw.Elapsed.TotalSeconds.ToString("0.000"));
sw.Stop();
});
}
}
}

复制代码

protected override void OnStart(string[] args)
{
ThreadPool.SetMinThreads(200, 200);
int port = int.Parse(ConfigurationManager.AppSettings["WebApiServicePort"]);
StartOptions options = new StartOptions();
options.Urls.Add("http://127.0.0.1:" + port);
options.Urls.Add("http://localhost:" + port);
options.Urls.Add("http://+:" + port);
WebApp.Start<Startup>(options);
LogUtil.Log("Web API 服务启动成功");
}

复制代码

using System;
using System.Collections.Generic;
using System.IO;
using System.Linq;
using System.Net;
using System.Text;
using System.Threading;
using System.Threading.Tasks;
namespace Utils
{
/// <summary>
/// Http上传下载文件
/// </summary>
public class HttpUtil
{
/// <summary>
/// HttpGet
/// </summary>
/// <param name="url">url路径名称</param>
/// <param name="cookie">cookie</param>
public static async Task<string> HttpGetAsync(string url, CookieContainer cookie = null, WebHeaderCollection headers = null)
{
// 设置参数
HttpWebRequest request = WebRequest.Create(url) as HttpWebRequest;
request.CookieContainer = cookie;
request.Method = "GET";
request.ContentType = "text/plain;charset=utf-8";
request.Timeout = Timeout.Infinite;
if (headers != null)
{
foreach (string key in headers.Keys)
{
request.Headers.Add(key, headers[key]);
}
}
//发送请求并获取相应回应数据
HttpWebResponse response = (HttpWebResponse)(await request.GetResponseAsync());
//直到request.GetResponse()程序才开始向目标网页发送Post请求
Stream instream = response.GetResponseStream();
StreamReader sr = new StreamReader(instream, Encoding.UTF8);
//返回结果网页（html）代码
string content = await sr.ReadToEndAsync();
instream.Close();
return content;
}
/// <summary>
/// HttpGet
/// </summary>
/// <param name="url">url路径名称</param>
/// <param name="cookie">cookie</param>
public static string HttpGet(string url, CookieContainer cookie = null, WebHeaderCollection headers = null)
{
// 设置参数
HttpWebRequest request = WebRequest.Create(url) as HttpWebRequest;
request.CookieContainer = cookie;
request.Method = "GET";
request.ContentType = "text/plain;charset=utf-8";
request.Timeout = Timeout.Infinite;
if (headers != null)
{
foreach (string key in headers.Keys)
{
request.Headers.Add(key, headers[key]);
}
}
//发送请求并获取相应回应数据
HttpWebResponse response = (HttpWebResponse)request.GetResponse();
//直到request.GetResponse()程序才开始向目标网页发送Post请求
Stream instream = response.GetResponseStream();
StreamReader sr = new StreamReader(instream, Encoding.UTF8);
//返回结果网页（html）代码
string content = sr.ReadToEnd();
instream.Close();
return content;
}
}
}

复制代码