Precautions for dragging from a WPF control to a winform Control

Recently, when developing a project, you need to embed the winform control in the WPF form. Some problems are encountered when trying to drag and drop the control from the WPF control to the winform control. The problems and solutions are summarized as follows:

1. If you have customized the drag object class, such

Public class dragobject
{
Public string name {Get; set ;}
}

The [serializable] feature should be added before the class definition. Otherwise, the target party will prompt "the object reference is not set to the object instance" when receiving data"

2. Sometimes the dragdrop event is not triggered on the winform side. In this case, the dragenter event should be triggered first and the drag-and-drop effect should be modified in the dragenter event, such as E. effect = dragdropeffects. copy; after modification, you can respond to the dragdrop event. In the dragdrop event, you can obtain the drag and drop data as follows: dragobject = E. data. getdata (typeof (dragobject) as dragobject;