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iSource = PercentImage(iSource);
//删除原图片文件
iSource.Dispose();
File.Delete(dirPath);
/// <summary>
/// 改变图片大小
/// </summary>
/// <param name="srcImage"></param>
/// <returns></returns>
public static Bitmap PercentImage(System.Drawing.Image srcImage)
{
int newW = srcImage.Width < 1800 ? srcImage.Width : 1800;
int newH = int.Parse(Math.Round(srcImage.Height * (double)newW / srcImage.Width).ToString());
try
{
Bitmap b = new Bitmap(newW, newH);
Graphics g = Graphics.FromImage(b);
g.InterpolationMode = System.Drawing.Drawing2D.InterpolationMode.Default;
g.DrawImage(srcImage, new Rectangle(0, 0, newW, newH), new Rectangle(0, 0, srcImage.Width, srcImage.Height), GraphicsUnit.Pixel);
g.Dispose();
return b;
}
catch (Exception)
{
return null;
}
}