ASP.NET 在 TransmitFile 中出现异常后删除文件

Question

我有以下代码:

try
{
    context.Response.TransmitFile(savedFileName);
}
catch (Exception ex)
{
    ExceptionUtility.LogException(new Exception("Exception while transmit zip [AttachmentsSecurityHandler.cs]: " + ex.Message), false);
}
finally
{
    try
    {
        Thread.Sleep(500);
        File.Delete(savedFileName);
    }
    catch (Exception ex)
    {
        ExceptionUtility.LogException(new Exception("Unable to delete temp zip file [AttachmentsSecurityHandler.cs]: " + ex.Message), false);
    }
}

一切正常，只有当用户取消下载时，我才会得到:

Exception while transmit zip [AttachmentsSecurityHandler.cs]: The remote host closed the connection. The error code is 0x800703E3.
Unable to delete temp zip file [AttachmentsSecurityHandler.cs]: The process cannot access the file 'D:\Hosting\***\html\attachments\tempCompressed\b9b5c47e-86f9-4610-9293-3b92dbaee222' because it is being used by another process.

删除孤立文件的唯一方法是尝试删除旧(例如小时)文件吗？系统会锁定多长时间(GoDaddy 共享主机)？谢谢你。

Answer 1

1)我认为您应该将 context.Response.Flush() 放在 TransmitFile() 之后，因为您想确保在继续删除文件之前已将文件流式传输到客户端。

2) TransferFile() 也在流式传输文件而不将其缓冲在内存中。这将在文件使用时锁定文件。您可能希望将其加载到内存中并改用 Response.OutputStream。