C# datatable中重复数据去重

        #region datatable去重
		 /// <summary>
        /// datatable去重
        /// </summary>
        /// <param name="dtSource">需要去重的datatable</param>
        /// <param name="columnNames">依据哪些列去重</param>
        /// <returns></returns>
        public static DataTable GetDistinctTable(DataTable dtSource, params string[] columnNames)
        {
            DataTable distinctTable = dtSource.Clone();
            try
            {
                if (dtSource != null && dtSource.Rows.Count > 0)
                {                  
                    DataView dv = new DataView(dtSource);
                    distinctTable = dv.ToTable(true, columnNames);
                }
            }
            catch (Exception ee)
            {
                MessageBox.Show(ee.ToString());
            }
            return distinctTable;
        }
		
        /// <summary>
        /// datatable去重
        /// </summary>
        /// <param name="dtSource">需要去重的datatable</param>
        /// <returns></returns>
        public static DataTable GetDistinctTable(DataTable dtSource)
        {
            DataTable distinctTable = null;
            try
            {
                if (dtSource != null && dtSource.Rows.Count > 0)
                {
                    string[] columnNames = GetTableColumnName(dtSource);
                    DataView dv = new DataView(dtSource);
                    distinctTable = dv.ToTable(true, columnNames);
                }
            }
            catch (Exception ee)
            {
                MessageBox.Show(ee.ToString());
            }
            return distinctTable;
        }
 
        #endregion
 
        #region 获取表中所有列名
        public static string[] GetTableColumnName(DataTable dt)
        {
            string cols = string.Empty;
            for (int i = 0; i < dt.Columns.Count; i++)
            {
                cols += (dt.Columns[i].ColumnName + ",");
            }
            cols = cols.TrimEnd(',');
            return cols.Split(',');
        }
        #endregion

微软内部实现：点击打开链接