Winform C中的错误拖动＃ [英] Error Dragdrop in Winform C#

问题描述

为什么我拖动Panel时不会在Panel中自动调整大小并显示在新面板中。

Why when I drag Panel shall not be automatically resized in Panel old and appears in the new Panel.

private void PanelMove(object sender, MouseEventArgs e)
       {  Panel p = new Panel();
           p = (Panel)sender;
           p.DoDragDrop(p, DragDropEffects.Link);
       }


       private void PanelDragEnter(object sender, DragEventArgs e)
       {
           currentpanel = (Panel)e.Data.GetData(e.Data.GetFormats()[0]);
           currentpanelParent = (Panel)currentpanel.Parent;
           e.Effect = DragDropEffects.Link;
       }
       private void PanelDrag(object sender, DragEventArgs e)
       {
           var newpanel = new Panel();
           var newpanel2 = new Panel();
           newpanel = (Panel)e.Data.GetData(e.Data.GetFormats()[0]);
           var ParentPanel =(Panel) ((Panel)sender).Parent;
           var totalcontrol = ParentPanel.Controls.Count;
           newpanel.Height = 30;
           newpanel2 = (Panel)sender;

           if (ParentPanel != currentpanelParent)
           {
               ParentPanel.Controls.Add(newpanel);
               ParentPanel.AutoSize = true;
               currentpanelParent.Controls.Remove(currentpanel);
               currentpanel.AutoSize = true;
           }
       }

https://dm2302files.storage.live.com/y2p6qaa6OiOq-PxjDs3Kq6URy2q-mgeDSa_2HakfGsRwbRUL6hVwo7qOPJHRWlsj_K0DQtgOkQzs6j5tvLzPzi0ry-0KMm_OqZGndSYwbks2DIFi3fViSiExqtKN0c0EKlht1Sa1z7i4lCUUcGgF1274Q/Error.jpg?psid = 1

https://dm2302files.storage.live.com/y2p6qaa6OiOq-PxjDs3Kq6URy2q-mgeDSa_2HakfGsRwbRUL6hVwo7qOPJHRWlsj_K0DQtgOkQzs6j5tvLzPzi0ry-0KMm_OqZGndSYwbks2DIFi3fViSiExqtKN0c0EKlht1Sa1z7i4lCUUcGgF1274Q/Error.jpg?psid=1

推荐答案

我不确定你想要实现的目标但是...

你分配新对象而不使用它们：

I'm not sure what you're trying to achieve but...
You allocate new objects without using them:

Panel p = new Panel()

var newpanel = new Panel();
var newpanel2 = new Panel()

拖放应该由包含对象初始化。

在这种情况下（我认为）它是窗口？

Drag and drop should be initialized by the containing object.
In this case (I think) it is the window?

this p.DoDragDrop(p, DragDropEffects.Link); 

你应该在drop事件处理程序中查找特定数据，否则这是一种不安全的做法。

You should look for a specific data in the drop event handler, otherwise it is an unsafe practice.

if(e.Data.GetDataPresent(typeof(Panel)))
newpanel = (Panel)e.Data.GetData(e.Data.GetFormats()[0] typeof(Panel));

首先尝试从上一个容器中删除面板然后将其添加到新的。

Try to firstly remove the panel from it's previous container and then add it to the new one.

这篇关于Winform C中的错误拖动＃的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！