1.示例代码

 private void button1_Click(object sender, EventArgs e){byte[] data = { 0x21, 0x22, 0x23, 0x24, 0x25, 0x26, 0x27, 0x28 }; //模拟要写入的数组List<byte[]> listBytes = new List<byte[]>();listBytes.Add(data); //数组转集合RecData(listBytes);  //调用方法MessageBox.Show("写入成功");}public void RecData(List<byte[]> listBytes){byte[] result = listBytes.SelectMany(bytes => bytes).ToArray();//正确转换方式 集合转数using (FileStream fsw = new FileStream("Data.raw", FileMode.Append, FileAccess.Write)){for (int i = 0; i < result.Length; i += 4) //按照四个字节拆分{byte[] tempArray = new byte[4];int length = Math.Min(4, result.Length - i); //返回两个数中的最小值Array.Copy(result, i, tempArray, 0, length);fsw.Write(tempArray, 0, tempArray.Length);}}}

输出结果：