C# 截图类

注意修改命名空间

using System.Drawing;

using System.Windows.Forms;

 

namespace WindowsFormsApplication1

{

    class ScreenCapture

    {

        private Bitmap _screenshot = null;

 

        /// <summary>

        /// 截取全屏

        /// </summary>

        /// <returns>返回值</returns>

        public Bitmap CaptureScreen()

        {

            return Capture(Rectangle.Empty, false);

        }

 

        /// <summary>

        /// 截取全屏并保存

        /// </summary>

        /// <param name="fileName">文件路径</param>

        /// <returns></returns>

        public Bitmap CaptureScreen(string fileName)

        {

            Bitmap screenshot = Capture(Rectangle.Empty, false);

            saveImage(fileName, screenshot);

            return screenshot;

        }

 

        /// <summary>

        /// 截屏到剪切板

        /// </summary>

        public void CopyToClipboard()

        {

            if (this._screenshot != null)

                Clipboard.SetImage(this._screenshot);

            else if (this._screenshot == null)

                MessageBox.Show("No screenshot found. Please take a screenshot first.", "Copy to Clipboard");

        }

 

        /// <summary>

        /// 区域截屏

        /// </summary>

        /// <param name="rect">区域范围</param>

        /// <returns>返回值</returns>

        public Bitmap CaptureRectangle(Rectangle rect)

        {

            return Capture(rect, true);

        }

 

        /// <summary>

        /// 区域截屏

        /// </summary>

        /// <param name="rect">区域范围</param>

        /// <param name="fileName">文件路径</param>

        /// <returns>返回值</returns>

        public Bitmap CaptureRectangle(Rectangle rect, string fileName)

        {

            Bitmap screenshot = Capture(rect, true);

            saveImage(fileName, screenshot);

            return screenshot;

        }

 

        private Bitmap Capture(Rectangle rect, bool isRect)

        {

            int screenWidth = Screen.PrimaryScreen.Bounds.Width;

            int screenHeight = Screen.PrimaryScreen.Bounds.Height;

 

            Bitmap screenshot = null;

 

            if(!isRect)

                screenshot = new Bitmap(screenWidth, screenHeight);

            else if(isRect)

                screenshot = new Bitmap(rect.Width, rect.Height);

 

            Graphics g = Graphics.FromImage(screenshot);

            if (!isRect)

            {

                g.CopyFromScreen(Point.Empty, Point.Empty, screenshot.Size);

            }

            else if (isRect)

            {

                g.CopyFromScreen(new Point(rect.X, rect.Y), Point.Empty, rect.Size);

            }

 

            this._screenshot = screenshot;

 

            return screenshot;

        }

 

        private void saveImage(string fileName, Bitmap screenshot)

        {

            string ext = System.IO.Path.GetExtension(fileName);;

            ext = ext.ToLower();

 

            if (ext == ".jpg" || ext == ".jpeg")

                screenshot.Save(fileName, System.Drawing.Imaging.ImageFormat.Jpeg);

            else if(ext == ".gif")

                screenshot.Save(fileName, System.Drawing.Imaging.ImageFormat.Gif);

            else if(ext == ".png")

                screenshot.Save(fileName, System.Drawing.Imaging.ImageFormat.Png);

            else if (ext == ".bmp")

                screenshot.Save(fileName, System.Drawing.Imaging.ImageFormat.Bmp);

            else if (ext == ".tiff")

                screenshot.Save(fileName, System.Drawing.Imaging.ImageFormat.Tiff);

        }

    }

}