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, , bufferWhole, , buffer1.Length);
             System.Buffer.BlockCopy(buffer2, , 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, , bytes.Length);
             // 设置当前流的位置为流的开始
             stream.Seek(, 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, , bytes.Length);
             // 设置当前流的位置为流的开始
             stream.Seek(, 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, , 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;
         }

         // ....

     }

 }