使用(a)BinaryReader 的所有字节的优雅方式?

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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