基于c#/Arcgis Engine开发时，从ArcCatalog拖放（DragDrog）数据集至TextBox的实现

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.  
    {
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    const string DATAOBJECT_ESRINAMES = "ESRI Names";
12.  
    public static bool IsValid(IDataObject dataObject)
13.  
    {
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    return dataObject.GetDataPresent(DATAOBJECT_ESRINAMES) ||
15.  
    dataObject.GetDataPresent(System.Windows.Forms.DataFormats.FileDrop);
16.  
    }
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    public static List<string> GetPaths(IDataObject dataObject)
18.  
    {
19.  
    List<string> foundPaths = new List<string>();
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    IDataObjectHelper dataObjectHelper = new DataObjectHelperClass();
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    dataObjectHelper.InternalObject = (object)dataObject;
22.  
     
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    if (dataObjectHelper.CanGetNames())
24.  
    {
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    IEnumName enumNames = dataObjectHelper.GetNames();
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    IName name;
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    while ((name = enumNames.Next()) != null)
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    {
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    if (name is IDatasetName)
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    {
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    IDatasetName datasetName = (IDatasetName)name;
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    // only accept feature classes and tables
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    if (datasetName.Type == esriDatasetType.esriDTFeatureClass ||
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    datasetName.Type == esriDatasetType.esriDTTable)
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    {
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    string path = System.IO.Path.Combine(datasetName.WorkspaceName.PathName, datasetName.Name);
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    foundPaths.Add(path);
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    }
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    // 还可以判断其他的类型
40.  
    // else if (name is ...) { }
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    }
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    }
43.  
    }
44.  
    else if (dataObjectHelper.CanGetFiles())
45.  
    {
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    string[] paths = (string[])dataObjectHelper.GetFiles();
47.  
    foreach (string path in paths)
48.  
    {
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    // TODO : Add code here to check if the file path is a valid path
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    foundPaths.Add(path);
51.  
    }
52.  
    }
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    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