C#DataTable去重操作_c# dt去重-优快云博客

本文链接：https://blog.youkuaiyun.com/CrazyMax_zh/article/details/104047695

本文详细介绍了在C#中如何使用DataTable进行数据去重操作，包括利用LINQ表达式、自定义去重函数等方法，帮助开发者高效处理重复数据。

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    #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 e)
            {
               
            }
            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 e)
            {
                
            }
            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