// <summary>
/// 圖片轉換成字節流
/// </summary>
/// <param name="img">要轉換的Image對象</param>
/// <returns>轉換後返回的字節流</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>
/// 字節流轉換成圖片
/// </summary>
/// <param name="byt">要轉換的字節流</param>
/// <returns>轉換得到的Image對象</returns>
public static Image BytToImg(byte[] byt, string imgUrl)
{
MemoryStream ms = new MemoryStream(byt);
Image img = Image.FromStream(ms);
img.Save(imgUrl);
return img;
}
//
/// <summary>
/// 根據圖片路徑返回圖片的字節流byte[]
/// </summary>
/// <param name="imagePath">圖片路徑</param>
/// <returns>返回的字節流</returns>
private static byte[] getImageByte(string imagePath)
{
FileStream files = new FileStream(imagePath, FileMode.Open);
byte[] imgByte = new byte[files.Length];
files.Read(imgByte, 0, imgByte.Length);
files.Close();
return imgByte;
}

圖片與文件流互轉