c# - BinaryWriter 问题 - "code adds some byte between Write() method"

Question

我正在尝试使用 BinaryWriter 和 BinaryReader 编写一些代码。当我想写时，我使用方法 Write()。但问题是，在 Write 方法的两行之间出现了一个新字节，它在 ASCII 表中以十进制 31(sometines 24)表示。您可以在这张图片上看到它:

您可以看到索引 4(第 5 个字节)处的字节是 ASCII 十进制值 31。我没有将它插入那里。如您所见，前 4 个字节保留用于数字 (Int32)，接下来是其他数据(主要是一些文本 - 现在这不重要)。

从我写的代码可以看出:- 进入第一行数字 10- 进入第二行文本“这是一些文本......”

中间的第 5 个字节(12 月 31 日)怎么来的？

这是我的代码:

static void Main(string[] args)
    {           
        //
        //// SEND - RECEIVE:
        //
        SendingData();
        Console.ReadLine();
    }

    private static void SendingData()
    {
        int[] commandNumbers = { 1, 5, 10 }; //10 is for the users (when they send some text)!

        for (int i = 0; i < commandNumbers.Length; i++)
        {
            //convert to byte[]
            byte[] allBytes;
            using (MemoryStream ms = new MemoryStream())
            {
                using (BinaryWriter bw = new BinaryWriter(ms))
                {
                    bw.Write(commandNumbers[i]);   //allocates 1st 4 bytes - FOR MAIN COMMANDS!
                    if (commandNumbers[i] == 10)
                        bw.Write("This is some text at command " + commandNumbers[i]); //HERE ON THIS LINE IS MY QUESTION!!!
                }
                allBytes = ms.ToArray();
            }

            //convert back:
            int valueA = 0;
            StringBuilder sb = new StringBuilder();
            foreach (var b in GetData(allBytes).Select((a, b) => new { Value = a, Index = b }))
            {
                if (b.Index == 0) //1st num
                    valueA = BitConverter.ToInt32(b.Value, 0);
                else //other text
                {
                    foreach (byte _byte in b.Value)
                        sb.Append(Convert.ToChar(_byte));
                }
            }

            if (sb.ToString().Length == 0)
                sb.Append("ONLY COMMAND");
            Console.WriteLine("Command = {0} and Text is \"{1}\".", valueA, sb.ToString());
        }
    }

    private static IEnumerable<byte[]> GetData(byte[] data)
    {
        using (MemoryStream ms = new MemoryStream(data))
        {
            using (BinaryReader br = new BinaryReader(ms))
            {
                int j = 0;
                byte[] buffer = new byte[4];
                for (int i = 0; i < data.Length; i++)
                {
                    buffer[j++] = data[i];
                    if (i == 3) //SENDING COMMAND DATA
                    {
                        yield return buffer;
                        buffer = new byte[1];
                        j = 0;
                    }
                    else if (i > 3) //SENDING TEXT
                    {
                        yield return buffer;
                        j = 0;
                    }
                }
            }
        }
    }

Answer 1

如果您查看 documentation for Write(string) ，您会看到它写入了一个长度前缀字符串。所以 31 是字符串中的字符数——完全正常。