C# 图片与byte[]之间以及byte[]与string之间的转换

using System;
using System.IO;
using System.Drawing;
using System.Windows.Forms;
using System.Drawing.Imaging;

public class ImageConvert
{

     //主要通过Stream作为中间桥梁
     public static Image ByteArrayToImage(byte[] iamgebytes)
     {
         MemoryStream ms = new MemoryStream(iamgebytes);
         Image image = Image.FromStream(ms);
         return image;
     }

     public static byte[] ImageToByteArray(Image image)
     {
         MemoryStream ms = new MemoryStream();
         image.Save(ms, image.RawFormat);
         return ms.ToArray();
     }

     public static string ByteArrayToString(byte[] bytes)
     {
          return Convert.ToBase64String(bytes);
     }

     public static string StringToByteArray(string image)
     {
         return Convert.FromBase64String(image);
     }
}

如何将jpg格式图像文件转化成一系列二进制数据，又如何将此二进制数据转化成jpg格式的文件？ 常常因为某种特殊的需要，如网络传输或者保存到数据库，或分块存放或者压缩等，总要将图片转换成字节数组。

Image image = Image.FromFile("C:\\1.jpg");
MemoryStream ms = new MemoryStream();
image.Save(ms,ImageFormat.Jpeg);
ms.Flush();
ms.Seek(0,SeekOrigin.Begin);
byte [] buffer = new byte[ms.Length];
ms.Read(buffer,0,(int)ms.Length);//这里已经转成了字节

MemoryStream ms2 = new MemoryStream(buffer,0,buffer.Length);
ms2.Seek(0,SeekOrigin.Begin);
Image image2 = Image.FromStream(ms2);
image2.Save("C:\\2.jpg",ImageFormat.Jpeg);

System.Drawing.Image image = System.Drawing.Image.FromFile("D:\\1.jpg");
System.IO.MemoryStream ms = new System.IO.MemoryStream();
　　image.Save(ms, System.Drawing.Imaging.ImageFormat.Jpeg);
    ms.Flush();
    ms.Seek(0, System.IO.SeekOrigin.Begin);
    byte[] buffer = new byte[ms.Length];
    ms.Read(buffer, 0, (int)ms.Length);//这里已经转成了字节
  
    System.IO.MemoryStream ms2 = new System.IO.MemoryStream(buffer, 0, buffer.Length);
    ms2.Seek(0, System.IO.SeekOrigin.Begin);
    System.Drawing.Image image2 = System.Drawing.Image.FromStream(ms2);
    image2.Save("D:\\2.jpg", System.Drawing.Imaging.ImageFormat.Jpeg);
 
    image.Dispose();
    image2.Dispose();
    ms.Dispose();
    ms2.Dispose();
    buffer = null;

winform直接显示二进制数据中的图片

 //读取DataSet中以二进制(Image)形式保存的图片
 byte[] byteImage = (byte[])dataSet11.tBGPicture.Rows[2]["PicContent"];

 //转成MemoryStream类型
 System.IO.MemoryStream stream = new System.IO.MemoryStream(byteImage, true);
 //stream.Write(byteImage, 0, byteImage.Length);
 
 //显示图片
 pictureBox1.Image = Image.FromStream(stream);   
            
 //关闭stream
 stream.Close();