删除DataTable重复列，只删除其中的一列重复行的

//去掉重复行
 DataView dv = table.DefaultView;
 table = dv.ToTable(true, new string[] { "name", "code" });

 此时table 就只有name、code无重复的两行了，如果还需要id值则

 table = dv.ToTable(true, new string[] { "id","name", "code" });//第一个参数true 启用去重复，类似distinct

id   name   code
    张三    123
    李四    456
    张三    456
   张三     123

id   name   code
    张三    123
    李四    456
    张三    456

table = dv.ToTable(true, new string[] { "name"});

name

张三 

李四 

 id   name   code

1    张三    123

2    李四    456

#region 删除DataTable重复列，类似distinct
         /// <summary>  
         /// 删除DataTable重复列，类似distinct  
         /// </summary>  
         /// <param name="dt">DataTable</param>  
         /// <param name="Field">字段名</param>  
         /// <returns></returns>  
         public static DataTable DeleteSameRow(DataTable dt, string Field)
         {
             ArrayList indexList = new ArrayList();
             // 找出待删除的行索引  
             for (int i = 0; i < dt.Rows.Count - 1; i++)
             {
                 if (!IsContain(indexList, i))
                 {
                     for (int j = i + 1; j < dt.Rows.Count; j++)
                     {
                         if (dt.Rows[i][Field].ToString() == dt.Rows[j][Field].ToString())
                         {
                             indexList.Add(j);
                         }
                     }
                 }
             }
             // 根据待删除索引列表删除行  
             for (int i = indexList.Count - 1; i >= 0; i--)
             {
                 int index = Convert.ToInt32(indexList[i]);
                 dt.Rows.RemoveAt(index);
             }
             return dt;
         }

         /// <summary>  
         /// 判断数组中是否存在  
         /// </summary>  
         /// <param name="indexList">数组</param>  
         /// <param name="index">索引</param>  
         /// <returns></returns>  
         public static bool IsContain(ArrayList indexList, int index)
         {
             for (int i = 0; i < indexList.Count; i++)
             {
                 int tempIndex = Convert.ToInt32(indexList[i]);
                 if (tempIndex == index)
                 {
                     return true;
                 }
             }
             return false;
         }
         #endregion