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   源码介绍

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using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Linq;
using System.Text;
using System.Windows.Forms;

namespace CutPatialScreen
{
    public partial class Form2 : Form
    {
        int x, y;//定义xy为截图的起始坐标
        private Form1 paf;//指向Form1窗体的引用,为了完成截图后将图片传回form1中的richTextBox1
        bool MouseIsDown = false;
		Rectangle MouseRect = Rectangle.Empty; 
		public Form2(Form1 parent)
		{
			InitializeComponent();
            paf = parent;//获取form1窗体的引用
            paf.WindowState = FormWindowState.Minimized;//将form1窗体最小化
            this.MouseDown  = new MouseEventHandler(frmMain_MouseDown);
            this.MouseMove  = new MouseEventHandler(frmMain_MouseMove);
            this.MouseUp  = new MouseEventHandler(frmMain_MouseUp);
            Screen scr = Screen.PrimaryScreen;
            Rectangle rc = scr.Bounds;
            int iWidth = rc.Width;
            int iHeight = rc.Height;
            //创建一个和屏幕一样大的Bitmap
            Image myImage = new Bitmap(iWidth, iHeight);
            //从一个继承自Image类的对象中创建Graphics对象
            Graphics g = Graphics.FromImage(myImage);
            //抓屏并拷贝到myimage里
            g.CopyFromScreen(new Point(0, 0), new Point(0, 0), new Size(iWidth, iHeight));
            //保存为文件
            //myImage.Save(@"c:/1.jpeg");
            this.BackgroundImage = myImage;//将整个屏幕图像放在form2窗体的背景中
            this.Left = 0;//left和top设置form2起始位置为屏幕左上角
            this.Top = 0;
            this.Show();//完成屏幕拷贝后显示form2
            this.Activate();//使form2为当前窗体显示在屏幕最前端
		}

		void frmMain_MouseUp(object sender, MouseEventArgs e)
		{
			this.Capture = false;
			Cursor.Clip = Rectangle.Empty;
			MouseIsDown = false;
			DrawRectangle();
			MouseRect = Rectangle.Empty;//清除虚线框

            //下面代码的作用是确保不管怎么画虚线框都能保证left和top是该框的左上角坐标
            #region
                int left=0;
                int top=0;
                int width=0;
                int height=0;
                if (x < e.X && y < e.Y)
                {
                    left = x;
                    top = y;
                }
                if (x > e.X && y > e.Y)
                {
                    left = e.X;
                    top = e.Y;
                }
                if (x > e.X && y < e.Y)
                {
                    left = e.X;
                    top = y;
                }
                if (x < e.X && y > e.Y)
                {
                    left = x;
                    top = e.Y;
                }
                width = Math.Abs(x - e.X);
                height = Math.Abs(y - e.Y);
            #endregion

            Bitmap bit = new Bitmap(Math.Abs(e.X - x), Math.Abs(e.Y - y));
            using (Graphics g = Graphics.FromImage(bit))
            {
                g.DrawImage(this.BackgroundImage, new Rectangle(0, 0, width, height), new Rectangle(left, top, width, height), GraphicsUnit.Pixel);
                Clipboard.SetDataObject(bit, false);
                paf.richTextBox1.Paste();
            }
            paf.WindowState = FormWindowState.Normal;//还原form1窗体
            this.Close();
		}
		void frmMain_MouseMove(object sender, MouseEventArgs e)
		{
			if (MouseIsDown)
				ResizeToRectangle(e.Location);
		}
		void frmMain_MouseDown(object sender, MouseEventArgs e)
		{
            x = e.X;
            y = e.Y;
			MouseIsDown = true;
			DrawStart(e.Location);
		}
		private void ResizeToRectangle(Point p)
		{
			DrawRectangle();
			MouseRect.Width = p.X - MouseRect.Left;
			MouseRect.Height = p.Y - MouseRect.Top;
			DrawRectangle();
		}
		private void DrawRectangle()
		{
			Rectangle rect = this.RectangleToScreen(MouseRect);
			ControlPaint.DrawReversibleFrame(rect, Color.White, FrameStyle.Dashed);
		}
		private void DrawStart(Point StartPoint)
		{
			this.Capture = true;
			Cursor.Clip = this.RectangleToScreen(new Rectangle(0, 0, ClientSize.Width, ClientSize.Height));
			MouseRect = new Rectangle(StartPoint.X, StartPoint.Y, 0, 0);
		}
    }
}