我有一个HttpHandler,我用来处理客户网站上的某些图像.当我将图像流输出到响应对象时,偶尔会调用Flush会抛出错误.这是一个代码块
var image = Image.FromStream(memStream); if (size > -1) image = ImageResize.ResizeImage(image,size,false); if (height > -1) image = ImageResize.Crop(image,height,ImageResize.AnchorPosition.Center); context.Response.Clear(); context.Response.ContentType = contentType; context.Response.BufferOutput = true; image.Save(context.Response.OutputStream,ImageFormat.Jpeg); context.Response.Flush(); context.Response.End();
从我读过的内容中,这个异常是由客户端在进程完成之前断开连接而导致的,没有任何冲突.
System.Web.HttpException: An error occurred while communicating with the remote host. The error code is 0x80070057. Generated: Mon,12 Oct 2009 03:18:24 GMT System.Web.HttpException: An error occurred while communicating with the remote host. The error code is 0x80070057. at System.Web.Hosting.ISAPIWorkerRequestInProcForIIS6.FlushCore(Byte[] status,Byte[] header,Int32 keepConnected,Int32 totalBodySize,Int32 numBodyFragments,IntPtr[] bodyFragments,Int32[] bodyFragmentLengths,Int32 doneWithSession,Int32 finalStatus,Boolean& async) at System.Web.Hosting.ISAPIWorkerRequest.FlushCachedResponse(Boolean isFinal) at System.Web.Hosting.ISAPIWorkerRequest.FlushResponse(Boolean finalFlush) at System.Web.HttpResponse.Flush(Boolean finalFlush) at System.Web.HttpResponse.Flush() at PineBluff.Core.ImageHandler.ProcessRequest(HttpContext context) in c:\TeamCity\buildAgent\work\79b3c57a060ff42d\src\PineBluff.Core\ImageHandler.cs:line 75 at System.Web.HttpApplication.CallHandlerExecutionStep.System.Web.HttpApplication.IExecutionStep.Execute() at System.Web.HttpApplication.ExecuteStep(IExecutionStep step,Boolean& completedSynchronously)
context.Response.Flush属于第75行.
在执行flush之前,是否有一种检查方法,而不会将其包装在try / catch块中.
解决方法
虽然我同意
Mitchel – 如果您在其他地方使用此功能,您可以先尝试致电
Response.IsClientConnnected.
Gets a value indicating whether the client is still connected to the server.
