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         }