这是使一个流的输入的输出到另一个的最佳方式 [英] What is the best way to make the output of one stream the input to another

问题描述

我不知道是否有更好的/内置的方式，比用一个字节的缓冲区和循环，从一个流中读取和写入到另一个（在.NET）等。通常这样做是为了应用转换到流并将其移动

I'm wondering if there is a better/inbuilt way, other than using a byte buffer and looping, to read from one stream and write it to another (in .NET). Generally this is done to apply a transform to a stream and move it on.

在这种情况下，我所加载的文件，把它通过放气流，写出来给一个文件（删除处理为简单起见，错误）：

In this instance, what I am loading a file, putting it through a deflate stream and writing it out to a file (Error handling removed for simplicity):

byte[] buffer = new byte[10000000];
using (FileStream fsin = new FileStream(filename, FileMode.Open))
{
    using (FileStream fsout = new FileStream(zipfilename, FileMode.CreateNew))
    {
        using (DeflateStream ds = new DeflateStream(fsout, CompressionMode.Compress))
        {
            int read = 0;
            do
            {
                read = fsin.Read(buffer, 0, buffer.Length);
                ds.Write(buffer, 0, read);
            }
            while (read > 0);
        }
    }
}
buffer = null;

编辑：

.NET 4.0现在有一个Stream.CopyTo功能，哈利路亚

.NET 4.0 now has a Stream.CopyTo function, Hallelujah

推荐答案

这里没有一个真正的比这更好的办法，但我更倾向于把循环部分成 CopyTo从扩展方法，如：

There's not really a better way than that, though I tend to put the looping part into a CopyTo extension method, e.g.

public static void CopyTo(this Stream source, Stream destination)
{
    var buffer = new byte[0x1000];
    int bytesInBuffer;
    while ((bytesInBuffer = source.Read(buffer, 0, buffer.Length)) > 0)
    {
        destination.Write(buffer, 0, bytesInBuffer);
    }
}

然后你可以拨打如下：

Which you could then call as:

fsin.CopyTo(ds);

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