每n分鐘

我已經實現，這將在應用程序啓動被解僱我的ASP.NET應用程序每n分鐘

using System.Web; 
using System.Threading.Tasks; 
using System; 
using System.Net.Http; 

namespace BL.HttpModules 
{ 
    public class MyCustomAsyncModule : IHttpModule 
    { 
     #region Static Privates 

     private static bool applicationStarted = false; 
     private readonly static object applicationStartLock = new object(); 

     #endregion 

     public void Dispose() 
     { 

     } 

     /// <summary> 
     /// Initializes the specified module. 
     /// </summary> 
     /// <param name="httpApplication">The application context that instantiated and will be running this module.</param> 
     public void Init(HttpApplication httpApplication) 
     { 
      if (!applicationStarted) 
      { 
       lock (applicationStartLock) 
       { 
        if (!applicationStarted) 
        { 
         // this will run only once per application start 
         this.OnStart(httpApplication); 
        } 
       } 
      } 
      // this will run on every HttpApplication initialization in the application pool 
      this.OnInit(httpApplication); 
     } 

     public virtual void OnStart(HttpApplication httpApplication) 
     {    
      httpApplication.AddOnBeginRequestAsync(OnBegin, OnEnd); 
     } 

     private IAsyncResult OnBegin(object sender, EventArgs e, AsyncCallback cb, object extraData) 
     { 
      applicationStarted = true; 
      var tcs = new TaskCompletionSource<object>(extraData); 
      DoAsyncWork(HttpContext.Current).ContinueWith(t => 
      { 
       if (t.IsFaulted) 
       { 
        tcs.SetException(t.Exception.InnerExceptions); 
       } 
       else 
       { 
        tcs.SetResult(null); 
       } 
       if (cb != null) cb(tcs.Task); 
      }); 
      return tcs.Task; 
     } 

     async Task DoAsyncWork(HttpContext ctx) 
     { 
      var client = new HttpClient(); 
      var result = await client.GetStringAsync("http://google.com"); 
      // USE RESULT 
     } 

     private void OnEnd(IAsyncResult ar) 
     { 
      Task t = (Task)ar; 
      t.Wait(); 
     } 

     /// <summary>Initializes any data/resources on HTTP module start.</summary> 
     /// <param name="httpApplication">The application context that instantiated and will be running this module.</param> 
     public virtual void OnInit(HttpApplication httpApplication) 
     { 
      // put your module initialization code here 


     } 

    }// end class 
}// end namespace

我希望每個5分鐘後火DoAsyncWork的HTTP模塊後，執行異步方法。你能幫助我在那個模塊中實現這個目標嗎？

來源

2017-06-05 Raghav

你知道asp.net中任何類型的計劃任務都是壞主意，不是嗎？ –

[以指定的時間間隔定期運行異步方法]可能的重複（https://stackoverflow.com/questions/30462079/run-async-method-regularly-with-specified-interval） – Amy

@Amy我不同意那個特定的重複，這是ASP.NET改變了你如何重複工作的限制這一事實，由於應用程序池的回收，鏈接副本中的兩個解決方案都無法在ASP.NET上長期運行。 –

在IIS中沒有內置的方法來可靠地執行此操作，您需要使用外部進程或第三方庫來安排要完成的工作。 Hangfire是一個非常流行的庫，可以讓您在進程和進程外進度計劃任務中執行。

來源

2017-06-05 15:01:04

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