Question

我有一个HTTPHandler，它将文件发送到客户端。我看到有时只记录错误。在所有情况下下载的文件都很小，不到1MB。这是错误/堆栈跟踪：

远程主机关闭了连接。   错误代码是0x800703E3。

at System.Web.Hosting.IIS7WorkerRequest.RaiseCommunicationError（Int32 result，Boolean throwOnDisconnect）
  在System.Web.Hosting.IIS7WorkerRequest.ExplicitFlush（）   在System.Web.HttpResponse.Flush（Boolean finalFlush）

以下是代码：

public class DownloadHttpHandler : IHttpHandler
{
    public bool IsReusable { get { return true; } }

    public void ProcessRequest(HttpContext context)
    {
        //Checking permission, getting the file path, etc...

        ResponseUtil.SendDownloadFile(context.Response, fullPath);
    }
}

public static class ResponseUtil
{
    /// <summary>Sends the specified file.</summary>
    public static void SendDownloadFile(HttpResponse response, string path, string contentType)
    {
        FileInfo fileInfo = new FileInfo(path);

        BeginSendDownloadFile(response, fileInfo.Name, contentType, fileInfo.Length);

        using (FileStream stream = File.OpenRead(path))
        {
            stream.CopyTo(response.OutputStream);
        }

        EndSendDownloadFile(response);
    }

    /// <summary>Prepares the output stream to send a downloadable file.</summary>
    public static void BeginSendDownloadFile(HttpResponse response, string filename, string contentType, long contentLength)
    {
        if (response.IsClientConnected)
        {
            response.AddHeader("Content-Disposition", "attachment; filename={0}".FormatString(filename));
            response.ContentType = contentType;
            response.AddHeader("Content-Length", contentLength.ToString());
        }
    }

    /// <summary>Flushes and closes the output stream.</summary>
    public static void EndSendDownloadFile(HttpResponse response)
    {
        if (response.IsClientConnected)
        {
            response.Flush();
            response.Close();
        }
    }
}

我想也许下载被取消所以我在几个地方添加了response.IsClientConnected个支票。但我仍然看到错误。

我是否应该致电Flush和Close？

文件下载HttpResponse.Flush上的HTTPHandler抛出错误

0 个答案: