byte[] 转图片

字符串转byte[]

byte[] by = ConVert.FromBase64String(st);

//byte[] 转图片
class BinaryImageConverter : IValueConverter{   

object IValueConverter.Convert( object value,Type targetType,object parameter,System.Globalization.CultureInfo culture )   
{       
if(value != null && value is byte[])       
{           
           byte[] bytes = value as byte[];

            MemoryStream stream = new MemoryStream( bytes );

            BitmapImage image = new BitmapImage();           
             image.BeginInit();           
              image.StreamSource = stream;           
               image.EndInit();

            return image;       
}

        return null;    }

    object IValueConverter.ConvertBack( object value,Type targetType,culture )
{
   throw new Exception("该方法不能执行");

}
}