C# 图片截取、放大、缩小与保存

using System;
using System.IO;
using System.Drawing;
using System.Drawing.Imaging;

namespace ConsoleApplication7
{
    class Program
    {
        static void Main(string[] args)
        {
            string imgsrc = @"C:\Users\Administrator\Desktop\a.jpg";
            //Image image = Image.FromFile(imgsrc);
            //image.Save(@"C:\Users\Administrator\Desktop\a1.png", ImageFormat.Png);//绝对路径
            /* //图片截取一部分
            Bitmap image = new Bitmap(imgsrc);
            Bitmap image1 = new Bitmap(200,100);
            int width = image.Width;
            int height = image.Height;
            Graphics g = Graphics.FromImage(image1);
            Rectangle rect = new Rectangle(0, 0, 200, 100);
            g.DrawImage(image,0,0,rect, GraphicsUnit.Pixel);
            image1.Save(@"C:\Users\Administrator\Desktop\a1.png", ImageFormat.Png);
            */
            /* //图片的放大和缩小
            Bitmap image = new Bitmap(imgsrc);
            Bitmap image1 = new Bitmap(300, 300);
            Graphics g = Graphics.FromImage(image1);
            Rectangle rect = new Rectangle(0, 0, 300, 300);
            g.DrawImage(image, rect);
            image1.Save(@"C:\Users\Administrator\Desktop\a1.jpg", ImageFormat.Jpeg);
            */
        }
    }
}