BitMap 图片格式与Base64Image格式互转方法

BitMap 图片格式与Base64Image格式互转方法

/// <summary>
/// 图片转为base64编码的字符串
/// </summary>
/// <param name="Imagefilename"></param>
/// <returns></returns>
protected string ImgToBase64String(string Imagefilename)
{
try
{
Bitmap bmp = new Bitmap(Imagefilename);
MemoryStream ms = new MemoryStream();
bmp.Save(ms, System.Drawing.Imaging.ImageFormat.Jpeg);
byte[] arr = new byte[ms.Length];
ms.Position = 0;
ms.Read(arr, 0, (int)ms.Length);
ms.Close();
return Convert.ToBase64String(arr);
}
catch (Exception ex)
{
return null;
}
}
/// <summary>
/// threeebase64编码的字符串转为图片
/// </summary>
/// <param name="strbase64"></param>
/// <returns></returns>
protected Bitmap Base64StringToImage(string strbase64)
{
try
{
byte[] arr = Convert.FromBase64String(strbase64);
MemoryStream ms = new MemoryStream(arr);
Bitmap bmp = new Bitmap(ms);
bmp.Save(@"d:test.jpg", System.Drawing.Imaging.ImageFormat.Jpeg);
//bmp.Save(@"d:"test.bmp", ImageFormat.Bmp);
//bmp.Save(@"d:"test.gif", ImageFormat.Gif);
//bmp.Save(@"d:"test.png", ImageFormat.Png);
ms.Close();
return bmp;
}
catch (Exception ex)
{
return null;
}
}