最好的方法从数据表中删除重复项 [英] Best way to remove duplicate entries from a data table

问题描述

什么是从数据表中删除重复项的最佳方式是什么？

What is the best way to remove duplicate entries from a Data Table?

推荐答案

删除重复

public DataTable RemoveDuplicateRows(DataTable dTable, string colName)
{
   Hashtable hTable = new Hashtable();
   ArrayList duplicateList = new ArrayList();

   //Add list of all the unique item value to hashtable, which stores combination of key, value pair.
   //And add duplicate item value in arraylist.
   foreach (DataRow drow in dTable.Rows)
   {
      if (hTable.Contains(drow[colName]))
         duplicateList.Add(drow);
      else
         hTable.Add(drow[colName], string.Empty); 
   }

   //Removing a list of duplicate items from datatable.
   foreach (DataRow dRow in duplicateList)
      dTable.Rows.Remove(dRow);

   //Datatable which contains unique records will be return as output.
      return dTable;
}

下面以下链接

<一个href="http://www.dotnetspider.com/resources/4535-Remove-duplicate-records-from-table.aspx">http://www.dotnetspider.com/resources/4535-Remove-duplicate-records-from-table.aspx

<一个href="http://www.dotnetspark.com/kb/94-remove-duplicate-rows-value-from-datatable.aspx">http://www.dotnetspark.com/kb/94-remove-duplicate-rows-value-from-datatable.aspx

有关删除列重复

<一个href="http://dotnetguts.blogspot.com/2007/02/removing-duplicate-records-from.html">http://dotnetguts.blogspot.com/2007/02/removing-duplicate-records-from.html

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