Form.OnDragDrop : Form « System.Windows.Forms « C# / C Sharp by API

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C# / C Sharp by API » System.Windows.Forms » Form 
Form.OnDragDrop
  


using System;
using System.Drawing;
using System.Drawing.Imaging;
using System.IO;
using System.Windows.Forms;

class ImageDrop : Form {
    bool bIsTarget;
    Image image;
    public static void Main() {
        Application.Run(new ImageDrop());
    }
    public ImageDrop() {
        AllowDrop = true;
    }
    protected override void OnDragOver(DragEventArgs dea) {
        if (dea.Data.GetDataPresent(DataFormats.FileDrop|| dea.Data.GetDataPresent(typeof(Metafile)) || dea.Data.GetDataPresent(typeof(Bitmap))) {
            if ((dea.AllowedEffect & DragDropEffects.Move!= 0)
                dea.Effect = DragDropEffects.Move;
            if (((dea.AllowedEffect & DragDropEffects.Copy!= 0&& ((dea.KeyState & 0x08!= 0))    // Ctrl key
                dea.Effect = DragDropEffects.Copy;
        }
    }
    protected override void OnDragDrop(DragEventArgs dea) {
        if (dea.Data.GetDataPresent(DataFormats.FileDrop)) {
            string[] astr = (string[])dea.Data.GetData(DataFormats.FileDrop);
            image = Image.FromFile(astr[0]);
            Invalidate();
        else {
            if (dea.Data.GetDataPresent(typeof(Metafile)))
                image = (Image)dea.Data.GetData(typeof(Metafile));
            else if (dea.Data.GetDataPresent(typeof(Bitmap)))
                image = (Image)dea.Data.GetData(typeof(Bitmap));
            bIsTarget = true;
            Invalidate();
        }
    }
    protected override void OnMouseDown(MouseEventArgs mea) {
        if (image != null) {
            bIsTarget = false;
            DragDropEffects dde = DoDragDrop(image,DragDropEffects.Copy | DragDropEffects.Move);
            if (dde == DragDropEffects.Move && !bIsTarget)
                image = null;
        }
    }
}

   
    
  
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8.Form.AutoScroll
9.Form.AutoScrollMinSize
10.Form.BackColor
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12.Form.CenterToScreen()
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14.Form.ClientSize
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16.Form.Closing
17.Form.ContextMenu
18.Form.ControlBox
19.Form.Controls
20.Form.Cursor
21.Form.DesktopBounds
22.Form.DialogResult
23.Form.DisplayRectangle
24.Form.Dispose
25.Form.FormBorderStyle
26.Form.ForeColor
27.Form.GotFocus
28.Form.Height
29.Form.Hide()
30.Form.Invalidate
31.Form.IsMdiContainer
32.Form.KeyPress
33.Form.KeyPreview
34.Form.KeyUp
35.Form.Load
36.Form.Location
37.Form.MaximizeBox
38.Form.MaximumSize
39.Form.MdiParent
40.Form.MenuComplete
41.Form.Menu
42.Form.MinimizeBox
43.Form.MinimumSize
44.Form.MouseDown
45.Form.MouseLeave(All other events)
46.Form.MouseUp
47.Form.OnDragOver
48.Form.OnInputLanguageChanged
49.Form.OnKeyDown
50.Form.OnKeyPress
51.Form.OnMouseEnter
52.Form.OnMouseHover
53.Form.OnMouseLeave
54.Form.OnMouseMove
55.Form.OnMouseWheel
56.Form.OnPaint(PaintEventArgs e)
57.Form.OnResize
58.Form.Opacity
59.Form.Paint
60.Form.Region
61.Form.Resize
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74.Form.WindowState
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