winform 仿QQ截图，可将截图直接保存到内存中 附完整

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 ScreenCutter
{
    public partial class Frm_Browser : Form
    {
        public Frm_Browser（）
        {
            InitializeComponent（）;
        }
        public Image ig;
        private Graphics MainPainter;
        private Pen pen;
        private bool isDowned;
        private Image baseImage;
        private Rectangle Rect;
        private bool RectReady;
        private Point downPoint;
        private bool change;
        Rectangle[] Rectpoints;
        int point;
        int tmpx;
        int tmpy;

        private void DrawRect（Graphics Painter int Mouse_x

 属性            大小     日期    时间   名称
----------- ---------  ---------- -----  ----
     目录           0  2011-12-22 23:10  ScreenCutter\
     文件         926  2013-05-18 20:04  ScreenCutter.sln
     文件       16384  2010-11-04 04:07  ScreenCutter.suo
     目录           0  2011-12-22 23:10  ScreenCutter\bin\
     目录           0  2013-05-18 20:04  ScreenCutter\bin\Debug\
     文件       13312  2013-05-18 20:04  ScreenCutter\bin\Debug\ScreenCutter.exe
     文件       34304  2013-05-18 20:04  ScreenCutter\bin\Debug\ScreenCutter.pdb
     文件        8918  2010-07-09 00:43  ScreenCutter\Frm_Browser.cs
     文件        2230  2010-07-09 00:43  ScreenCutter\Frm_Browser.Designer.cs
     文件        5814  2008-10-12 00:45  ScreenCutter\Frm_Browser.resx
     文件         888  2010-07-09 00:43  ScreenCutter\Frm_Main.cs
     文件        2159  2010-07-09 00:42  ScreenCutter\Frm_Main.Designer.cs
     文件        5814  2008-12-24 22:27  ScreenCutter\Frm_Main.resx
     目录           0  2011-12-22 23:10  ScreenCutter\obj\
     目录           0  2013-05-18 20:04  ScreenCutter\obj\Debug\
     文件         789  2013-05-18 20:04  ScreenCutter\obj\Debug\DesignTimeResolveAssemblyReferences.cache
     文件        7164  2013-05-18 20:04  ScreenCutter\obj\Debug\DesignTimeResolveAssemblyReferencesInput.cache
     目录           0  2011-12-22 23:10  ScreenCutter\obj\Debug\Refactor\
     文件        6027  2013-05-18 20:04  ScreenCutter\obj\Debug\ScreenCutter.csproj.FileListAbsolute.txt
     文件         914  2013-05-18 20:04  ScreenCutter\obj\Debug\ScreenCutter.csproj.GenerateResource.Cache
     文件        1757  2013-05-18 20:04  ScreenCutter\obj\Debug\ScreenCutter.csprojResolveAssemblyReference.cache
     文件       13312  2013-05-18 20:04  ScreenCutter\obj\Debug\ScreenCutter.exe
     文件         180  2013-05-18 20:04  ScreenCutter\obj\Debug\ScreenCutter.Frm_Browser.resources
     文件         180  2013-05-18 20:04  ScreenCutter\obj\Debug\ScreenCutter.Frm_Main.resources
     文件       34304  2013-05-18 20:04  ScreenCutter\obj\Debug\ScreenCutter.pdb
     文件         180  2013-05-18 20:04  ScreenCutter\obj\Debug\ScreenCutter.Properties.Resources.resources
     目录           0  2013-05-18 20:04  ScreenCutter\obj\Debug\TempPE\
     文件        4608  2013-05-18 20:04  ScreenCutter\obj\Debug\TempPE\Properties.Resources.Designer.cs.dll
     文件         496  2010-07-09 00:42  ScreenCutter\Program.cs
     目录           0  2011-12-22 23:10  ScreenCutter\Properties\
     文件        1356  2008-10-11 21:46  ScreenCutter\Properties\AssemblyInfo.cs
............此处省略5个文件信息