为什么加入全屏就不能把图片显示了呢

using System;

using System.Collections.Generic;

using System.ComponentModel;

using System.Data;

using System.Drawing;

using System.Text;

using System.Windows.Forms;

using System.Drawing.Imaging;



namespace 截屏

{

    public partial class Form1 : Form

    {

        public Form1()

        {

            InitializeComponent();





            //this.FormBorderStyle = System.Windows.Forms.FormBorderStyle.None;

            //this.WindowState = System.Windows.Forms.FormWindowState.Maximized; 

        }

       [System.Runtime.InteropServices.DllImportAttribute("gdi32.dll")]

        private static extern bool BitBlt(

        IntPtr hdcDest,   //   目标   DC的句柄   

        int nXDest,

        int nYDest,

        int nWidth,

        int nHeight,

        IntPtr hdcSrc,     //   源DC的句柄   

        int nXSrc,

        int nYSrc,

        System.Int32 dwRop     //   光栅的处理数值   

        );

        [System.Runtime.InteropServices.DllImport("gdi32.dll")]

        public static extern IntPtr CreateDC(

        string lpszDriver, // 驱动名称

        string lpszDevice, // 设备名称

        string lpszOutput, // 无用，可以设定位"NULL"

        IntPtr lpInitData // 任意的打印机数据

        );





        private void button1_Click(object sender, EventArgs e)

        {

            //获得当前屏幕的大小

            Rectangle rect = new Rectangle();

            rect = Screen.GetWorkingArea(this);

            //创建一个以当前屏幕为模板的图象

            Graphics g1 = this.CreateGraphics();

            //创建以屏幕大小为标准的位图 

            Image MyImage = new Bitmap(rect.Width, rect.Height, g1);

            Graphics g2 = Graphics.FromImage(MyImage);

            //得到屏幕的DC

            IntPtr dc1 = g1.GetHdc();

            //得到Bitmap的DC 

            IntPtr dc2 = g2.GetHdc();

            //调用此API函数，实现屏幕捕获

            BitBlt(dc2, 0, 0, rect.Width, rect.Height, dc1, 0, 0, 13369376);

            //释放掉屏幕的DC

            g1.ReleaseHdc(dc1);

            //释放掉Bitmap的DC 

            g2.ReleaseHdc(dc2);

            //以JPG文件格式来保存

            MyImage.Save(@"c:\Capture.jpg", ImageFormat.Jpeg);

            MessageBox.Show("当前屏幕已经保存为C盘的capture.jpg文件！");

        }

        public Bitmap getscreen(int left, int top, int width, int height)

        {

            IntPtr dc1 = CreateDC("DISPLAY", null, null, (IntPtr)null);

            Graphics newGraphics = Graphics.FromHdc(dc1);

            Bitmap img = new Bitmap(width, height, newGraphics);

            Graphics thisGraphics = Graphics.FromImage(img);

            IntPtr dc2 = thisGraphics.GetHdc();

            IntPtr dc3 = newGraphics.GetHdc();

            BitBlt(dc2, 0, 0, width, height, dc3, left, top, 13369376);

            thisGraphics.ReleaseHdc(dc2);

            newGraphics.ReleaseHdc(dc3);

            return img;

        }





        private void button2_Click(object sender, EventArgs e)

        {

            Image MyImage = getscreen(0, 0, Screen.PrimaryScreen.Bounds.Width, Screen.PrimaryScreen.Bounds.Height);

            MyImage.Save(@"c:\Capture.png", ImageFormat.Png);

            MessageBox.Show("当前屏幕已经保存为C盘的capture.jpg文件！");

            Graphics g1 = this.CreateGraphics(); 

            this.FormBorderStyle = System.Windows.Forms.FormBorderStyle.None;

            this.WindowState = System.Windows.Forms.FormWindowState.Maximized; 

            g1.DrawImage(MyImage, new Point(100, 100));

        }



    }

}

补充：.NET技术 ,  C#

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