HttpHandler解析

using System;
using System.Web;

public class CustomHttpHandler : IHttpHandler
{
    public bool IsReusable
    {
        get { return false; }
    }

    public void ProcessRequest(HttpContext context)
    {
        context.Response.ContentType = "text/plain";
        context.Response.Write("Hello from CustomHttpHandler");
    }
}

<configuration>
  <system.webServer>
    <handlers>
      <add name="CustomHttpHandler" path="*.custom" verb="*" type="Namespace.CustomHttpHandler, AssemblyName"/>
    </handlers>
  </system.webServer>
</configuration>

public class AsyncHttpHandler : IHttpAsyncHandler
{
    public IAsyncResult BeginProcessRequest(HttpContext context, AsyncCallback cb, object extraData)
    {
        var asyncResult = new AsyncResult(cb, extraData);
        Task.Run(() => ProcessRequest(context));
        return asyncResult;
    }

    public void EndProcessRequest(IAsyncResult result)
    {
        // 结束处理
    }

    public void ProcessRequest(HttpContext context)
    {
        context.Response.ContentType = "text/plain";
        context.Response.Write("Hello from AsyncHttpHandler");
    }

    public bool IsReusable
    {
        get { return false; }
    }
}

public class AsyncResult : IAsyncResult
{
    private readonly AsyncCallback _callback;
    private readonly object _state;

    public AsyncResult(AsyncCallback callback, object state)
    {
        _callback = callback;
        _state = state;
    }

    // 实现IAsyncResult接口的其他成员
}