原文：http://www.samuelbosch.com/2009/06/drag-drop-from-arccatalog.html

帮助类：

1.   using System.Collections.Generic;
2.   using System.Windows.Forms;
3.   using ESRI.ArcGIS.esriSystem;
4.   using ESRI.ArcGIS.Geodatabase;
5.   using ESRI.ArcGIS.SystemUI;
6.    
7.   namespace GisSolved.DragDrop
8.   {
9.   public class EsriDragDrop
10.   {
11.   const string DATAOBJECT_ESRINAMES = "ESRI Names";
12.   public static bool IsValid(IDataObject dataObject)
13.   {
14.   return dataObject.GetDataPresent(DATAOBJECT_ESRINAMES) ||
15.   dataObject.GetDataPresent(System.Windows.Forms.DataFormats.FileDrop);
16.   }
17.   public static List<string> GetPaths(IDataObject dataObject)
18.   {
19.   List<string> foundPaths = new List<string>();
20.   IDataObjectHelper dataObjectHelper = new DataObjectHelperClass();
21.   dataObjectHelper.InternalObject = (object)dataObject;
22.    
23.   if (dataObjectHelper.CanGetNames())
24.   {
25.   IEnumName enumNames = dataObjectHelper.GetNames();
26.   IName name;
27.   while ((name = enumNames.Next()) != null)
28.   {
29.   if (name is IDatasetName)
30.   {
31.   IDatasetName datasetName = (IDatasetName)name;
32.   // only accept feature classes and tables
33.   if (datasetName.Type == esriDatasetType.esriDTFeatureClass ||
34.   datasetName.Type == esriDatasetType.esriDTTable)
35.   {
36.   string path = System.IO.Path.Combine(datasetName.WorkspaceName.PathName, datasetName.Name);
37.   foundPaths.Add(path);
38.   }
39.   // 还可以判断其他的类型
40.   // else if (name is ...) { }
41.   }
42.   }
43.   }
44.   else if (dataObjectHelper.CanGetFiles())
45.   {
46.   string[] paths = (string[])dataObjectHelper.GetFiles();
47.   foreach (string path in paths)
48.   {
49.   // TODO : Add code here to check if the file path is a valid path
50.   foundPaths.Add(path);
51.   }
52.   }
53.   return foundPaths;
54.   }
55.   }
56.   }

TextBox要设置AllowDrag = true，并且设置两个事件：_DragEnter（拖放数据进来时的判断）、_DragDrop（拖放鼠标放开时的事件），代码如下：

private void TextBoxPath_DragEnter(object sender, DragEventArgs e)
{
 e.Effect = EsriDragDrop.IsValid(e.Data) ? DragDropEffects.All : DragDropEffects.None; // 判断是从Arcgis拖放来的数据才允许
}

private void TextBoxPath_DragDrop(object sender, DragEventArgs e)
{
 List<string> paths = EsriDragDrop.GetPaths(e.Data); // 获得拖放过来的数据集的路径
}
来自：https://blog.csdn.net/kowity/article/details/79454104