使用(a)BinaryReader 的所有字节的优雅方式? [英] An elegant way to consume (all bytes of a) BinaryReader?

问题描述

是否有一种优雅的方法可以用 BinaryReader 模拟 StreamReader.ReadToEnd 方法?也许将所有字节放入一个字节数组?

Is there an elegant to emulate the StreamReader.ReadToEnd method with BinaryReader? Perhaps to put all the bytes into a byte array?

我这样做:

read1.ReadBytes((int)read1.BaseStream.Length);

...但一定有更好的方法.

...but there must be a better way.

推荐答案

原始答案(阅读下面的更新！)

只需:

byte[] allData = read1.ReadBytes(int.MaxValue);

文档 说它将读取所有字节，直到到达流末尾.

The documentation says that it will read all bytes until the end of the stream is reached.

虽然这看起来很优雅，并且文档似乎表明这会起作用，但实际的实现(在 .NET 2、3.5 和 4 中检查)为数据，这可能会在 32 位系统上导致 OutOfMemoryException.

Although this seems elegant, and the documentation seems to indicate that this would work, the actual implementation (checked in .NET 2, 3.5, and 4) allocates a full-size byte array for the data, which will probably cause an OutOfMemoryException on a 32-bit system.

因此，我会说实际上没有一种优雅的方式.

相反，我会推荐@iano 答案的以下变体.此变体不依赖于 .NET 4:
为BinaryReader(或Stream，两者的代码相同)创建一个扩展方法.

Instead, I would recommend the following variation of @iano's answer. This variant doesn't rely on .NET 4:
Create an extension method for BinaryReader (or Stream, the code is the same for either).

public static byte[] ReadAllBytes(this BinaryReader reader)
{
    const int bufferSize = 4096;
    using (var ms = new MemoryStream())
    {
        byte[] buffer = new byte[bufferSize];
        int count;
        while ((count = reader.Read(buffer, 0, buffer.Length)) != 0)
            ms.Write(buffer, 0, count);
        return ms.ToArray();
    }
    
}

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