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/把字符串还原成图片
public void CreateImg()
{
StreamReader sr = new StreamReader(MapPath("11.txt"));
string s = sr.ReadToEnd();
sr.Close();
byte[] buf = Convert.FromBase64String(s);//把字符串读到字节数组中
MemoryStream ms = new MemoryStream(buf);
System.Drawing.Image img = System.Drawing.Image.FromStream(ms);
img.Save(MapPath("12.jpg"), System.Drawing.Imaging.ImageFormat.Jpeg);
ms.Close();
ms.Dispose();
}