ArcGis 获取数据表中某字段唯一值

from:http://www.cnblogs.com/3echo/archive/2006/08/16/478094.html

  1 /// <summary>

 2         /// 得到要素类某字段的唯一值
 3         /// </summary>
 4         /// <param name="pFeatureClass">要素类</param>
 5         /// <param name="strFld">指定要得到唯一值的字段</param>
 6         /// <returns>唯一值字符数据</returns>
 7         List<string> GetUniqueValue(IFeatureClass pFeatureClass, string strFld)
 8         {
 9             List<string> lst = new List<string>();
10             //得到IFeatureCursor游标
11             IFeatureCursor pCursor = pFeatureClass.Search(null, false);
12 
13             //coClass对象实例生成
14             IDataStatistics pData = new DataStatisticsClass();
15             pData.Field = strFld;
16             pData.Cursor = pCursor as ICursor;
17 
18             //枚举唯一值
19             IEnumerator pEnumVar = pData.UniqueValues;
20 
21             //记录总数
22             int RecordCount = pData.UniqueValueCount;
23 
24             //字符数组
25             pEnumVar.Reset();
26 
27             while (pEnumVar.MoveNext())
28             {
29                 lst.Add(pEnumVar.Current.ToString());
30             }
31 
32             return lst;
33         }