图像未拖动到新图片框

Question

我想将图片框拖放到新的图片框中。

我使用的代码，但想知道是否需要更多代码来允许drga和drop。

public void mouseEvents()    
    {
        // Allow mouse down
        pbMIDI.MouseDown += pb1_MouseDown;

        // Set picture poxes to allow drop
        dragTo1.AllowDrop = true;

        // Allow enter and drop on each picture box
        drop1.DragEnter += drag1_DragEnter;
        drop1.DragDrop += drop1_DragDrop;
    }


// MIDI Drag and Drop
    private void pb1_MouseDown(object sender, MouseEventArgs e)
    {
        var img = pbMIDI.Image;
        if (img == null) return;
        if (DoDragDrop(img, DragDropEffects.Move) == DragDropEffects.Move)
        {
            pbMIDI.Image = null;
        }
    }
    void drag1_DragEnter(object sender, DragEventArgs e)
    {
        if (e.Data.GetDataPresent(DataFormats.Bitmap))
        {
            e.Effect = DragDropEffects.Move;
        }
    }
    void drop1_DragDrop(object sender, DragEventArgs e)
    {
        var bmp = (Bitmap)e.Data.GetData(DataFormats.Bitmap);
        drop1.Image = bmp;
    }

在pictureScreen（）中调用的mouseEvents：

public pictureScreen()
    {
        InitializeComponent();

        mouseEvents();
    }