在两个目的地复制流内容 [英] Copy stream content on two destinations

问题描述

我知道可以使用 sourceStream.CopyTo(targetStream); 将一个流复制到另一个流，但是我想将 sourceStream 的内容复制到中的两个目标流>两个不同的 Task s .当我两次调用此方法时，第二次流为空.

I know it's possible to copy one stream to another with sourceStream.CopyTo(targetStream); but I want to copy content of sourceStream to two destination streams in two different Tasks. When I call this method two times, in second time stream is empty.

那有可能吗?一种简单的方法是将流内容加载到内存中，然后将其复制到目标上，但这可能会导致 OutOfMemoryException .

Is that possible at all? A simple way is to load stream content to memory then copy it on targets, but it may cause OutOfMemoryException.

如果有问题，我正在使用.Net 4.5

If it matters I'm using .Net 4.5

推荐答案

如果要同时将它复制到两个目标 ，则类似以下内容:

If you're copying it to two destinations at the same time, then something like:

byte[] buffer = new byte[SOME_SIZE];

int bytesRead;
while((bytesRead = source.Read(buffer, 0, buffer.Length)) > 0)
{
    dest1.Write(buffer, 0, bytesRead);
    dest2.Write(buffer, 0, bytesRead);
}

这将遍历输入流一次，将每个块写入两个输出.这几乎是 CopyTo 内部执行的操作-唯一的区别是第二个输出.

This iterates through the input stream once, writing each chunk to two outputs. This is pretty much what CopyTo does internally - the only difference is the second output.

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