C#、java DataInputStream.readFully() 等效项

Question

我正在编写 C# Windows 应用商店应用程序，我通过套接字接收数据。 我想知道，对于 java DataInptStream.ReadFully() 是否有任何 C# 等效方法。 如此处所写http://www.tutorialspoint.com/java/io/datainputstream_readfully.htm

method reads bytes from an input stream and allocates those into the buffer array b.

It blocks until the one of the below conditions occurs: b.length bytes of input data are available. Are there are any equivalent method in C#? That woul wait until length of bytes would de available?

Answer 1

此处缺少 Java 文档中的一些文本，但据我了解，您需要一种方法来准确读取缓冲区较大的字节数，或者失败并抛出某种异常。

BinaryReader.ReadBytes(由 No One 建议)不会像这样:

A byte array containing data read from the underlying stream. This might be less than the number of bytes requested if the end of the stream is reached.

据我所知，没有其他方法具有等效的行为，但您可以使用 extension method 创建它:

public static void ReadFully(this Stream stream, byte[] buffer)
{
    int offset = 0;
    int readBytes;
    do
    {
        // If you are using Socket directly instead of a Stream:
        //readBytes = socket.Receive(buffer, offset, buffer.Length - offset,
        //                           SocketFlags.None);

        readBytes = stream.Read(buffer, offset, buffer.Length - offset);
        offset += readBytes;
    } while (readBytes > 0 && offset < buffer.Length);

    if (offset < buffer.Length)
    {
        throw new EndOfStreamException();
    }
}

然后您可以使用该扩展方法，就好像它是 Stream 类的一部分一样，假设您已经导入了它在以下位置定义的命名空间:

byte[] buffer = new byte[8192];
myNetworkStream.ReadFully(buffer);