C#学习图片与二进制流互转

using System;
using System.Collections.Generic;
using System.IO;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using System.Drawing;

namespace ConsoleApplication1
{
    class Program
    {
        static void Main(string[] args)
        {

            #region 图片与二进制流互转
            //将图片转换成二进制流
            byte[] bytes = GetPictureData(@"C:\Users\test\Documents\Visual Studio 2015\Projects\test\ConsoleApplication1\ConsoleApplication1\Img\Hydrangeas.jpg");

            //将二进制流转换成图片保存
            using (MemoryStream mem = new MemoryStream())
            {
                Image img = ReturnPhoto(bytes);
                //这句很重要，不然不能正确保存图片或出错（关键就这一句）
                Bitmap bmp = new Bitmap(img);
                //保存到磁盘文件
                bmp.Save(@"C:\Users\test\Documents\Visual Studio 2015\Projects\test\ConsoleApplication1\ConsoleApplication1\Img\Hydrangeas111.jpg", img.RawFormat);
                bmp.Dispose();
            }
            #endregion


            #region 读取文件转成二进制流， 然后保二进制流转成图片
            using (FileStream fsread = new FileStream(@"C:\Users\test\Documents\Visual Studio 2015\Projects\test\ConsoleApplication1\ConsoleApplication1\Img\Hydrangeas.jpg", FileMode.OpenOrCreate, FileAccess.ReadWrite))
            {
                using (FileStream fs = new FileStream(@"C:\Users\test\Documents\Visual Studio 2015\Projects\test\ConsoleApplication1\ConsoleApplication1\Img\Hydrangeas222.jpg", FileMode.OpenOrCreate, FileAccess.ReadWrite))
                {
                    byte[] buffer = new byte[1024 * 1024];
                    int bufferLength = 0;
                    int bufferCount = 1;

                    while ((bufferLength = fsread.Read(buffer, 0, buffer.Length)) > 0)
                    {
                        fs.Write(buffer, 0, buffer.Length);
                        Console.WriteLine("当前读取第{0}次", bufferCount++);
                    }
                }
            }
            #endregion



            Console.ReadKey();
        }



        public static byte[] GetPictureData(string imagepath)
        {
            FileStream fs = new FileStream(imagepath, FileMode.Open);//可以是其他重载方法 
            byte[] bytes= new byte[fs.Length];
            fs.Read(bytes, 0, bytes.Length);
            fs.Close();
            return bytes;
        }


        public static Image ReturnPhoto(byte[] streamByte)
        {
            MemoryStream ms = new MemoryStream(streamByte);
            Image img = Image.FromStream(ms);
            return img;
        }

    }

   


}