当ASP.NET处理大型文件传输，你应该采取什么样的precautions？ [英] When handling large file transfers in ASP.NET what precautions should you take?

问题描述

我的ASP.NET应用程序允许用户上传和下载大型文件。这两个过程都涉及读写文件流。我应该怎么做，以确保应用程序不挂或者当它处理大量文件崩溃？如果文件操作可以在一个工作线程，例如如何处理？

My ASP.NET application allows users to upload and download large files. Both procedures involve reading and writing filestreams. What should I do to ensure the application doesn't hang or crash when it handles a large file? Should the file operations be handled on a worker thread for example?

推荐答案

请确保你正确地缓冲文件，以便它们不采取过多数量的内存在系统中。

Make sure you properly buffer the files so that they don't take inordinate amounts of memory in the system.

例如。从下载的应用程序，while循环中，读取文件摘录：

e.g. excerpt from a download application, inside the while loop that reads the file:

// Read the data in buffer.
length = iStream.Read(buffer, 0, bufferSize);

// Write the data to the current output stream.
Response.OutputStream.Write(buffer, 0, length);

在哪里缓冲区大小是合理的东西，例如， 100000字节，权衡的是，这将是更小的缓冲区大小慢。

Where bufferSize is something reasonable, e.g. 100000 bytes, the trade-off is that it will be slower for smaller buffer sizes.

http://support.microsoft.com/kb/812406

编辑：另外要确保IIS设置取一个足够大的请求长度（IIS7），并暂停。

Also be sure that IIS is set to take a large enough request length (IIS7) and timeout.

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