BufferHelp byte[] Stream string FileStream Image Bitmap

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using System.Drawing;
using System.IO;
using System.Text;

namespace Endv
{
    //BufferHelp
    public static class Buffer
    {
        /// <summary>
        /// 拼接 byte
        /// </summary>
        /// <param name="buffer1"></param>
        /// <param name="buffer2"></param>
        /// <returns></returns>
        public static byte[] Joint(byte[] buffer1, byte[] buffer2)
        {
            byte[] bufferWhole = new byte[buffer1.Length + buffer2.Length]; 
            System.Buffer.BlockCopy(buffer1, 0, bufferWhole, 0, buffer1.Length); 
            System.Buffer.BlockCopy(buffer2, 0, bufferWhole, buffer1.Length, buffer2.Length);
            return bufferWhole;
        }

        public static byte[] Joint(byte[] buffer1, byte[] buffer2, byte[] buffer3)
        {
            return Joint(Joint(buffer1, buffer2), buffer3);
        }

        public static byte[] Joint(byte[] buffer1, byte[] buffer2, byte[] buffer3, byte[] buffer4)
        {
            return Joint(Joint(buffer1, buffer2, buffer3), buffer4);
        }

        public static byte[] Joint(byte[] buffer1, byte[] buffer2, byte[] buffer3, byte[] buffer4, byte[] buffer5, byte[] buffer6)
        {
            return Joint(Joint(buffer1, buffer2, buffer3, buffer4), buffer5, buffer6);
        }

        // ....


        // 将 Stream 转成 byte[] 
        public static byte[] StreamToBytes(Stream stream)
        {
            byte[] bytes = new byte[stream.Length];
            stream.Read(bytes, 0, bytes.Length);
            // 设置当前流的位置为流的开始
            stream.Seek(0, SeekOrigin.Begin);
            return bytes;
        }

        // 将 byte[] 转成 Stream 
        public static Stream BytesToStream(byte[] bytes)
        {
            Stream stream = new MemoryStream(bytes);
            return stream;
        }

        // 将 byte[] 转成 string 
        public static string BytesToString(byte[] bytes)
        {
            UnicodeEncoding converter = new UnicodeEncoding();
            string s = converter.GetString(bytes);
            return s;
        }

        // string 转成 byte[] 
        public static byte[] StringToBytes(string s)
        {
            UnicodeEncoding converter = new UnicodeEncoding();
            byte[] bytes = converter.GetBytes(s);
            return bytes;
        }

        //Stream 和 文件之间的转换
        //将 Stream 写入文件
        public static void StreamToFile(Stream stream, string fileName)
        {
            // 把 Stream 转换成 byte[]
            byte[] bytes = new byte[stream.Length];
            stream.Read(bytes, 0, bytes.Length);
            // 设置当前流的位置为流的开始
            stream.Seek(0, SeekOrigin.Begin);
            // 把 byte[] 写入文件
            FileStream fs = new FileStream(fileName, FileMode.Create);
            BinaryWriter bw = new BinaryWriter(fs);
            bw.Write(bytes);
            bw.Close();
            fs.Close();
        }
        //从文件读取 Stream
        public static Stream FileToStream(string fileName)
        {
            // 打开文件
            FileStream fileStream = new FileStream(fileName, FileMode.Open, FileAccess.Read, FileShare.Read);
            // 读取文件的 byte[]
            byte[] bytes = new byte[fileStream.Length];
            fileStream.Read(bytes, 0, bytes.Length);
            fileStream.Close();
            // 把 byte[] 转换成 Stream
            Stream stream = new MemoryStream(bytes);
            return stream;
        }

        //二进制转换成图片
        public static Image bytesToImage(byte[] bytes)
        {
            MemoryStream ms = new MemoryStream(bytes);
            Image img = Image.FromStream(ms);
            return img;
        }

        //图片 转换成 byte
        public static byte[] ImageTobytes(Image img)
        {
            Bitmap BitReturn = new Bitmap(img);
            byte[] bytes = null;
            MemoryStream ms = new MemoryStream();
            BitReturn.Save(ms, System.Drawing.Imaging.ImageFormat.Png);
            bytes = ms.GetBuffer();
            return bytes;
        }

        // ....

    }

}