c# - 从 C# Stream 读取而无需忙于等待

Question

我需要从 C# 中的 Stream 读取内容。我不知道它会是哪种流。让我们假设它是网络流并且网络非常慢。所以我不能立即读取所有字节。我知道流中的 4 个字节是整数，这个 int 定义了我们需要从流中获取的内容长度。如何在不忙于等待（循环）的情况下做到这一点？

private (int headerValue, bool isSuccess) ReadHeader()
{
    var bytesRead = 0;
    var headerBuffer = new byte[BufferHeaderLength];
    var headerIsReady = false;

    while (!headerIsReady)
    {
        try
        {
            var availableBytesToRead = Math.Min(BufferHeaderLength - bytesRead, underlyingStream.Length); // should be a number from 0 to 4

            bytesRead += underlyingStream.Read(headerBuffer, bytesRead, (int)availableBytesToRead);

            if (bytesRead == 0)
            {
                break;
            }
        }
        catch (Exception)
        {
            break;
        }

        headerIsReady = bytesRead == BufferHeaderLength;
    }

    var headerValue = headerIsReady ? BitConverter.ToInt32(headerBuffer, 0) : 0;

    return (headerValue, headerIsReady);
}