C＃拖放圖片框2

Question

我遇到問題。我有一組picturebox被拖入一個picturebox。如何在拖動後禁用特定的picturebox？所以，它不能再拖了。

private void pictureBox1_MouseDown(object sender, MouseEventArgs e) 
    { 
    if (e.Button == MouseButtons.Left) 
     pictureBox1.DoDragDrop(pictureBox1.Image, DragDropEffects.All); 
    } 

    private void pictureBox2_DragEnter(object sender, DragEventArgs e) 
    { 
    if (e.Data.GetDataPresent(DataFormats.Bitmap)) 
     e.Effect = DragDropEffects.Copy; 
    else 
     e.Effect = DragDropEffects.None; 
    } 

    private void pictureBox2_DragDrop(object sender, DragEventArgs e) 
    { 
    if ((e.Data.GetDataPresent(DataFormats.Bitmap))) 
     this.pictureBox2.Image = (Bitmap)(e.Data.GetData(DataFormats.Bitmap)); 
    } 

Answer 1

相反拖動PictureBox的圖像，拖動PictureBox。
刪除時，將它的標籤屬性設置爲true。

在MouseDown事件中，檢查Tag屬性是否爲空，並且僅在它爲時拖動。

private void pictureBox1_MouseDown(object sender, MouseEventArgs e) 
{ 
    if (e.Button == MouseButtons.Left && pictureBox1.Tag == null) 
     pictureBox1.DoDragDrop(pictureBox1.Image, DragDropEffects.All); 
} 

private void pictureBox2_DragEnter(object sender, DragEventArgs e) 
{ 
    if (e.Data.GetDataPresent(typeof(PictureBox))) 
     e.Effect = DragDropEffects.Copy; 
    else 
     e.Effect = DragDropEffects.None; 
} 

private void pictureBox2_DragDrop(object sender, DragEventArgs e) 
{ 
    if (e.Data.GetDataPresent(typeof(PictureBox))) 
    { 
     var picturebox = ((PictureBox)e.Data.GetData(typeof(PictureBox))); 
     picturebox.Tag = true; 
     this.pictureBox2.Image = picturebox.Image; 
    } 
}