行 60:                 stream.Read(bytes, 0, bytes.Length);
行 61:                 // 设置当前流的位置为流的开始 
行 62:                 stream.Seek(0, SeekOrigin.Begin);
行 63:             }
行 64:             return bytes;

[NotSupportedException: HashStream does not support seeking]
   Aliyun.OSS.Common.Internal.HashStream.Seek(Int64 offset, SeekOrigin origin) +112
   Sp.TBM.Common.OssHelper.GetObject(String key) in D:\sinopec-tbm\源代码\05.Common\Sp.TBM.Common\OssHelper.cs:62
   Sp.TBM.Web.Common.DownloadFile.ProcessRequest(HttpContext context) in D:\sinopec-tbm\源代码\01.Web\Sp.TBM.Web\Common\DownloadFile.ashx.cs:45
   System.Web.CallHandlerExecutionStep.System.Web.HttpApplication.IExecutionStep.Execute() +790
   System.Web.HttpApplication.ExecuteStepImpl(IExecutionStep step) +195
   System.Web.HttpApplication.ExecuteStep(IExecutionStep step, Boolean& completedSynchronously) +88