AspNet同步上下文

AspNet同步上下文：简化Web应用程序的并发处理

csharp
using System;
using System.Threading;
using System.Threading.Tasks;
using System.Web;
public class MyAsyncHandler : IHttpAsyncHandler
{
    public bool IsReusable => true;
    public void ProcessRequest(HttpContext context)
    {
        throw new NotImplementedException();
    }
    public IAsyncResult BeginProcessRequest(HttpContext context, AsyncCallback cb, object extraData)
    {
        // 在异步操作开始之前，将AspNet同步上下文关联到当前线程
        SynchronizationContext.SetSynchronizationContext(new AspNetSynchronizationContext());
        // 执行异步操作
        var task = DoAsyncWork();
        // 返回异步结果
        return task.ContinueWith(t => cb(task));
    }
    public void EndProcessRequest(IAsyncResult result)
    {
        // 处理异步操作的结果
        var task = (Task)result;
        var resultData = task.Result;
        // 进行后续处理
        // ...
    }
    private async Task DoAsyncWork()
    {
        // 在AspNet同步上下文中执行异步操作
        return await Task.Run(() =>
        {
            // 模拟耗时操作
            Thread.Sleep(1000);
            return "Hello, World!";
        });
    }
}