public partial class MainForm : Form
{
    public MainForm()
    {
        InitializeComponent();
        this.CenterToParent();
        this.MaximumSize = this.Size;
        this.MinimumSize = this.Size;
    }
    private void Btn_Screenshot_Click(object sender, EventArgs e)
    {
        this.Hide();
        Thread.Sleep(500);
        Screenshot();
    }
    /// 截圖方法
    private void Screenshot()
    {
        try
        {
            // 獲取屏幕尺寸
            Rectangle bounds = Screen.GetBounds(Point.Empty);
            // 創(chuàng)建位圖對象
            using (Bitmap bitmap = new Bitmap(bounds.Width, bounds.Height))
            {
                // 創(chuàng)建繪圖對象
                using (Graphics g = Graphics.FromImage(bitmap))
                {
                    // 將屏幕內(nèi)容復制到位圖中
                    g.CopyFromScreen(Point.Empty, Point.Empty, bounds.Size);
                }
                this.Show();
                //顯示圖像
                FrmScreenshotEditor frmScreenshotEditor = new FrmScreenshotEditor();
                frmScreenshotEditor.Image = bitmap;
                frmScreenshotEditor.ShowDialog();
            }
        }
        catch (Exception ex)
        {
            MessageBox.Show($"截圖失敗: {ex.Message}", "錯誤",MessageBoxButtons.OK, MessageBoxIcon.Error);
        }
    }
}

public partial class FrmScreenshotEditor :WinFormBase
 {
     public Image Image
     {
         get => uvCanvas.Image;
         set
         {
             uvCanvas.Image = value;
             Invalidate();
         }
     }
     public FrmScreenshotEditor()
     {
         InitializeComponent();
         this.CenterToParent();
         this.WindowState = FormWindowState.Maximized;
     }
     private void btn_Save_Click(object sender, System.EventArgs e)
     {
         SaveFileDialog  saveFileDialog = new SaveFileDialog();
         saveFileDialog.FileName = "截圖1";     //設置初始文件名
         saveFileDialog.Filter= "PNG Image|*.png|JPEG Image|*.jpg|BMP Image|*.bmp";
         if (saveFileDialog.ShowDialog()== DialogResult.OK)
         {
             string extension = Path.GetExtension(saveFileDialog.FileName).ToLower();
             ImageFormat imageFormat;
             switch (extension)
             {
                 case ".png":
                     imageFormat = ImageFormat.Png;
                     break;
                 case ".jpg":
                     imageFormat = ImageFormat.Jpeg;
                     break;
                 case ".bmp":
                     imageFormat = ImageFormat.Bmp;
                     break;
                 default:
                     imageFormat = ImageFormat.Png;
                     break;
             }
             try
             {
                 Image.Save(saveFileDialog.FileName, imageFormat);
                 MessageBox.Show($"圖片已成功保存至: {saveFileDialog.FileName}");
             }
             catch (Exception ex)
             {
                 MessageBox.Show($"保存圖片時出錯: {ex.Message}");
             }
         }
     }
 }