C#拖放 - e.Data.GetData使用基类 [英] C# Drag and Drop - e.Data.GetData using a base class
问题描述
我有一个用户控件的列表,全部派生自一个基类。这些控件可以添加到各种面板,我正在尝试实现拖放功能,我正在运行的问题是DragDrop事件。
对于DragEventArgs e.Data.GetData(typeof(baseClass))
不起作用。它想要:
e.Data.GetData(typeof(derivedClass1))
e.Data.GetData(typeof derivedClass2))
etc ...
有没有办法可以解决这个问题,或者更好的构建它的方法?
您可以将数据包装在一个公共类中。例如,假设你的基类被称为DragDropBaseControl
public class DragDropInfo
{
public DragDropBaseControl Control {得到;私人集合
public DragDropInfo(DragDropBaseControl control)
{
this.Control = control;
}
}
然后可以使用以下内容启动拖放在基础类中
DoDragDrop(new DragDropInfo(this),DragDropEffects.All);
您可以使用以下
访问拖动事件中的数据
e.Data.GetData(typeof(DragDropInfo));
我是否正确理解了您的要求?
I am using C# and Winforms 3.5
I have a list of user controls all derived from one base class. These controls can be added to various panels and I'm trying to implement the drag-drop functionality, the problem I'm running in to is on the DragDrop event.
For DragEventArgs e.Data.GetData(typeof(baseClass))
doesn't work. It wants:
e.Data.GetData(typeof(derivedClass1))
e.Data.GetData(typeof(derivedClass2))
etc...
Is there a way I can get around this, or a better way to architect it?
You can wrap the data in a common class. For example, assuming your base class is called DragDropBaseControl
public class DragDropInfo
{
public DragDropBaseControl Control { get; private set; }
public DragDropInfo(DragDropBaseControl control)
{
this.Control = control;
}
}
And then the drag drop can be initiated with the following in the base class
DoDragDrop(new DragDropInfo(this), DragDropEffects.All);
And you can access the data in the drag events using the following
e.Data.GetData(typeof(DragDropInfo));
Have I understood your requirement correctly?
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