[.Net,C#]三类资源：流对象Stream，字节数组byte[]，图片Image

using System;
using System.Collections.Generic;
using System.Drawing;
using System.IO;
using System.Linq;
using System.Text;
using System.Threading.Tasks;namespace sunshine.application.common
{
//三类资源：流对象Stream，字节数组byte[]，图片Image
//Stream/Bytes[]/Image对象相互转化,http://www.cnblogs.com/fanyong/p/3938017.html
//关系：Stream<=>byte[],byte[]<=>Image
public class ImageToByteHelper
{
/*-------------------------------------------Stream 与Image相互转化的媒介是byte[],开始-------------------------------------------------*/
/// <summary>
/// 将 Stream 转成 byte[]
/// </summary>
/// <param name="stream"></param>
/// <returns></returns>
public static byte[] StreamToBytes(Stream stream)
{
byte[] bytes = new byte[stream.Length];
stream.Seek(, SeekOrigin.Begin);
stream.Read(bytes, , bytes.Length);
// 设置当前流的位置为流的开始
stream.Seek(, SeekOrigin.Begin);
return bytes;
} /// <summary>
/// 将 byte[] 转成 Stream
/// </summary>
/// <param name="bytes"></param>
/// <returns></returns>
public static Stream BytesToStream(byte[] bytes)
{
Stream stream = new MemoryStream(bytes);
return stream;
} /// <summary>
/// 图片转换成字节流
/// </summary>
/// <param name="img">要转换的Image对象</param>
/// <returns>转换后返回的字节流</returns>
public static byte[] ImgToByt(Image img)
{
MemoryStream ms = new MemoryStream();
byte[] imagedata = null;
img.Save(ms, System.Drawing.Imaging.ImageFormat.Jpeg);
imagedata = ms.GetBuffer();
return imagedata;
} /// <summary>
/// 字节流转换成图片
/// </summary>
/// <param name="byt">要转换的字节流</param>
/// <returns>转换得到的Image对象</returns>
public static Image BytToImg(byte[] byt)
{
MemoryStream ms = new MemoryStream(byt);
Image img = Image.FromStream(ms);
return img;
} /*-------------------------------------------Stream 与Image相互转化的媒介是byte[],结束-------------------------------------------------*/ /// <summary>
/// 图片转换成字节流
/// </summary>
/// <param name="img">要转换的Image对象</param>
/// <returns>转换后返回的字节流</returns>
public static Stream ImgToStream(Image img)
{
byte[] imgByte = ImgToByt(img);
//img.Save(ms, img.RawFormat);//System.Drawing.Imaging.ImageFormat.Jpeg
Stream stream = new MemoryStream(imgByte);
return stream;
}
//
/// <summary>
/// 根据图片路径返回图片的字节流byte[]
/// </summary>
/// <param name="imagePath">图片路径</param>
/// <returns>返回的字节流</returns>
private static byte[] getImageFielByte(string imagePath)
{
FileStream files = new FileStream(imagePath, FileMode.Open);
byte[] imgByte = new byte[files.Length];
files.Read(imgByte, , imgByte.Length);
files.Close();
return imgByte;
}
}
}