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//保存Chart1的图片
SaveFileDialog sfd = new SaveFileDialog();
sfd.Filter = "BMP文件|*.bmp|JPEG文件|*.jpg";
if (sfd.ShowDialog() == DialogResult.OK)
{
if (sfd.FilterIndex == 1)
chart1.SaveImage (sfd.FileName, System.Drawing.Imaging.ImageFormat.Bmp);
else
chart1.SaveImage (sfd.FileName, System.Drawing.Imaging.ImageFormat.Jpeg);
}