ManualResetEvent.WaitOne始终挂在ASP.NET MVC

Question

我使用远程云服务器来存储我的图像。如果我使用控制台执行这些代码，它运行良好，但在asp.net mvc中它始终挂在在 “的WaitOne（）”

public class UploadUtil 
{ 

    public static string UploadBase64(string bucket,string filelocation) 
    { 
     //qiniu.Config.ACCESS_KEY = System.Configuration.ConfigurationManager.AppSettings["ACCESS_KEY"]; 
     //qiniu.Config.SECRET_KEY = System.Configuration.ConfigurationManager.AppSettings["SECRET_KEY"]; 
     qiniu.Config.InitFromAppConfig(); 

     string qiniuKey = Guid.NewGuid().ToString(); 
     string returnUrl = string.Empty; 

     ManualResetEvent done = new ManualResetEvent(false); 
     jpegToBase64 jpeg = new jpegToBase64(filelocation); 
     QiniuFile qfile = new QiniuFile(bucket, qiniuKey); 
     qfile.UploadCompleted += (sender, e) => { 
      returnUrl = e.RawString; 
      Console.Write(e.RawString); 
      done.Set(); 

     }; 
     qfile.UploadFailed += (sender, e) => { 
      QiniuWebException qe = (QiniuWebException)e.Error; 
      Console.WriteLine(qe.Error.ToString()); 
     }; 
     qfile.UploadString((int)jpeg.Filesize, "image/png", jpeg.Base64Content); 
     done.WaitOne(); 
     return returnUrl; 

    } 

} 

的ActionResult的是这样的，如果我用正常的ActionResult，该错误会occurd，所以我必须使用任务

public Task<ActionResult> TestUpload() 
    { 
     var s = UploadUtil.UploadBase64("kmsfan", @"D:\\b.jpg"); 
     return null; 

    } 

Answer 1

你的ManualResetEvent将永远不会如果上传失败，则发送信号。您应该避免在服务器环境中阻塞同步代码。

使用TaskCompletionSource来代表你的异步上传任务：

public class UploadUtil 
{ 

    public static Task<string> UploadBase64Async(string bucket,string filelocation) 
    { 
     var tcs = new TaskCompletionSource<string>(); 
     qiniu.Config.InitFromAppConfig(); 

     string qiniuKey = Guid.NewGuid().ToString(); 

     jpegToBase64 jpeg = new jpegToBase64(filelocation); 
     QiniuFile qfile = new QiniuFile(bucket, qiniuKey); 
     qfile.UploadCompleted += (sender, e) => { 
      var returnUrl = e.RawString; 
      Console.Write(returnUrl); 
      tcs.SetResult(returnUrl);  
     }; 
     qfile.UploadFailed += (sender, e) => { 
      QiniuWebException qe = (QiniuWebException)e.Error; 
      Console.WriteLine(qe.Error.ToString()); 
      tcs.SetException(qe); 
     }; 
     qfile.UploadString((int)jpeg.Filesize, "image/png", jpeg.Base64Content); 
     return tcs.Task;  
    } 

} 

控制器：

public async Task<string> TestUpload() 
{ 
    var s = await UploadUtil.UploadBase64Async("kmsfan", @"D:\\b.jpg"); 
    return s; 
}