ArcGIS Pro 2.7 API Reference Guide
DropHandlerBase Class
Members  Example 

ArcGIS.Desktop.Framework.Contracts Namespace : DropHandlerBase Class
Represents a class that wants to process drag and drop operations. This is an abstract class.
Syntax
public abstract class DropHandlerBase : ArcGIS.Desktop.Framework.DragDrop.IDropTarget  
Public MustInherit Class DropHandlerBase 
   Implements ArcGIS.Desktop.Framework.DragDrop.IDropTarget 
Remarks

This DropHandlerBase class provides little implementation, it satisfies the IDropTarget interface as simply as possible.

Example
<TreeView ItemsSource="{Binding Items}"
          framework:DragDrop.IsDragSource="true"
          framework:DragDrop.IsDropTarget="true"              
          framework:DragDrop.DropHandler="{Binding myViewModel.TreeDropHandler}" 
          framework:DragDrop.DragHandler="{Binding myViewModel.TreeDropHandler}" >
Inheritance Hierarchy

System.Object
   ArcGIS.Desktop.Framework.Contracts.DropHandlerBase

Requirements

Target Platforms: Windows 10, Windows 8.1

See Also

Reference

DropHandlerBase Members
ArcGIS.Desktop.Framework.Contracts Namespace