我在c#using.Net 4.5中遇到了问题。
当我使用.Net 3.5时我没有任何问题,但是因为我将我的项目更改为.Net 4.5,当我在两个listBox之间执行我的拖放和listBox时,我有一个例外:
“无法在类型......中投射MS.Internal.Named.Object类型的对象”
关于这个问题的任何想法?
(抱歉我的英文,我是法国人^^)
编辑: 是的,当我使用“as ...”时,我丢失了一些数据。 最后我重新定义了Drag& Frop的功能,问题得到了解决。
如果有人感兴趣的话,这是Drag& Drop的代码:):
/// <summary>
/// Define the action when the left mouse button is pressed while the mouse pointer is over this element. Permit to get the shape selected by the clic
/// </summary>
/// <param name="sender"></param>
/// <param name="e"></param>
private void ListBoxShapeCluster_PreviewMouseLeftButtonDown(object sender, MouseButtonEventArgs e)
{
System.Windows.Controls.ListBox parent = (System.Windows.Controls.ListBox)sender;
dragSource = parent;
object data = GetDataFromListBox(dragSource, e.GetPosition(parent));
if (data != null)
{
DragDrop.DoDragDrop(parent, data, System.Windows.DragDropEffects.Move);
}
}
/// <summary>
/// Define the action of the drag enter
/// </summary>
/// <param name="sender"></param>
/// <param name="e"></param>
private void ListBoxShapeCluster_DragEnter(object sender, System.Windows.DragEventArgs e)
{
object data = e.Data.GetData(typeof(Retro.Model.core.Shape));
if (data != null)
{
AllShapesOfCurrentCluster.Remove((Retro.Model.core.Shape)data);
}
}
/// <summary>
/// Define the action for drop a shape in a new cluster
/// </summary>
/// <param name="sender"></param>
/// <param name="e"></param>
private void ListBoxShapeCluster_Drop(object sender, System.Windows.DragEventArgs e)
{
System.Windows.Controls.ListBox parent = (System.Windows.Controls.ListBox)sender;
object data = e.Data.GetData(typeof(Retro.Model.core.Shape));
if (data != null)
{
AllShapesOfCurrentCluster.Add((Retro.Model.core.Shape)data);
}
}
#endregion
答案 0 :(得分:0)
你试过吗
_dragged.Content AS Retro.Model.core.Shape