在C#中查找和写入大于2GB的文件 [英] Seeking and writing files bigger than 2GB in C#

问题描述

在C#中，FileStream的方法Read/Write/Seek在参数中使用integer.在上一篇文章中，我已经看到了一种读取/写入以下文件的好方法:比分配给进程的虚拟内存大.

In C#, the FileStream's methods Read/Write/Seek take integer in parameter. In a previous post , I have seen a good solution to read/write files that are bigger than the virtual memory allocated to a process.

如果您要从头到尾写入数据，则此解决方案有效.但就我而言，我接收的数据块没有特定的顺序.

This solution works if you want to write the data from the beginning to the end. But in my case, the chunks of data I am receiving are in no particular order.

我有一个适用于小于2GB的文件的代码:

I have a code that works for files smaller than 2GB :

private void WriteChunk(byte[] data, int position, int chunkSize, int count, string path)
    {

        FileStream destination = new FileStream(path, FileMode.OpenOrCreate, FileAccess.Write);
        BinaryWriter writer = new BinaryWriter(destination);
        writer.Seek((int) (position*chunkSize), SeekOrigin.Begin);
        writer.Write(data, 0, count);
        writer.Close();
    }

有没有一种方法可以在大于2GB的文件中查找和写入我的块?

Is there a way I can seek and write my chunks in files bigger than 2GB?

推荐答案

不要使用int，请使用long.寻求需要很长时间.

Don't use int, use long. Seek takes a long.

尽管您需要在各处使用long，而不仅仅是将int转换为int.

You need to use long everywhere though and not just cast to int somewhere.

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