csharp:Compare two DataTables to rows in one but not the other

        /// <summary>
        /// 账面数据 Accounting
        /// </summary>
        /// <returns></returns>
        DataTable setDataAccounting()
        {
            DataTable dt = new DataTable();
            dt.Columns.Add("id", typeof(int));
            dt.Columns.Add("empno", typeof(string));
            dt.Columns.Add("empname", typeof(string));
            dt.Columns.Add("sex", typeof(bool));
            dt.Columns.Add("wage", typeof(decimal));
            dt.Columns.Add("birthday", typeof(DateTime));
            dt.Rows.Add(1, "L0001", "涂聚文",false,4500,"1970-03-04");
            dt.Rows.Add(2, "L0002", "刘杰", false, 4300, "1972-04-04");
            dt.Rows.Add(3, "L0003", "宋承宪", false, 4500, "1974-04-04");
            dt.Rows.Add(4, "L0005", "宁夏", false, 4500, "1973-04-04");
            dt.Rows.Add(6, "L0009", "江东", true, 5500, "1975-04-04");
            dt.Rows.Add(6, "L0010", "李燕云", true, 9500, "1976-04-04");
            dt.Rows.Add(7, "L0020", "赵雅芝", false, 14500, "1977-04-04");

            return dt;
        }
        /// <summary>
        /// 盘点数据 Inventory
        /// </summary>
        /// <returns></returns>
        DataTable setDataInventory()
        {
            DataTable dt = new DataTable();
            dt.Columns.Add("id", typeof(int));
            dt.Columns.Add("empno", typeof(string));
            dt.Columns.Add("empname", typeof(string));
            dt.Columns.Add("sex", typeof(bool));
            dt.Columns.Add("wage", typeof(decimal));
            dt.Columns.Add("birthday", typeof(DateTime));
            dt.Rows.Add(10, "L0001", "涂聚文", false, 4500, "1970-03-04");
            dt.Rows.Add(11, "L0002", "刘杰", false, 4300, "1972-04-04");
            dt.Rows.Add(12, "L0009", "江东", true, 5500, "1973-04-04");
            dt.Rows.Add(13, "L0010", "李燕云", true, 9500, "1974-04-04");
            dt.Rows.Add(14, "L0020", "赵雅芝", false, 14500, "1975-04-04");
            dt.Rows.Add(15, "L0032", "徐若萱", false, 4300, "1976-04-04");
            dt.Rows.Add(16, "L0056", "保芝林", true, 4200, "1977-04-04");
            dt.Rows.Add(17, "L0042", "何燕华", false, 4100, "1978-04-04");
            dt.Rows.Add(18, "L0052", "黄花菜", false, 4400, "1979-04-04");
            dt.Rows.Add(19, "L0012", "艾薇儿", true, 5500, "1982-04-04");
            dt.Rows.Add(20, "L0018", "傅艺伟", false, 6500, "1932-04-04");
            dt.Rows.Add(21, "L0028", "李世民", false, 9500, "1992-04-04");
            return dt;
        }


        /// <summary>
        /// 
        /// </summary>
        public Form1()
        {
            InitializeComponent();
        }
        /// <summary>
        /// 
        /// </summary>
        /// <param name="sender"></param>
        /// <param name="e"></param>
        private void Form1_Load(object sender, EventArgs e)
        {
            this.dataGridViewAccounting.DataSource = setDataAccounting();

            this.dataGridViewInventory.DataSource = setDataInventory();



        }
        /// <summary>
        /// 比结果
        /// 
        /// </summary>
        /// <param name="sender"></param>
        /// <param name="e"></param>
        private void button1_Click(object sender, EventArgs e)
        {

            try
            {
                DataTable datadiff1 = new DataTable();
                DataTable datadiff2 = new DataTable();
                DataTable dataOverage = new DataTable();//盘盈
                DataTable dataInventoryLoss = new DataTable();//盘亏

                DataTable datatable1 = setDataAccounting();
                DataTable datatable2 = setDataInventory();


                #region 
                //var qry1 = datatable1.AsEnumerable().Select(a => new { MobileNo = a["empno"].ToString() });
                //var qry2 = datatable2.AsEnumerable().Select(b => new { MobileNo = b["empno"].ToString() });
                //var exceptAB = qry1.Except(qry2);
                ////
                //DataTable dtMisMatch = (from a in datatable1.AsEnumerable()
                //                        join ab in exceptAB on a["empno"].ToString() equals ab.MobileNo
                //                        select a).CopyToDataTable();

                ////detect row deletes - a row is in datatable1 except missing from datatable2
                //var exceptAB1 = qry1.Except(qry2);
                // dataInventoryLoss= (from a in datatable1.AsEnumerable()
                //               join ab in exceptAB1 on a["empno"].ToString() equals ab.MobileNo
                //               select a).CopyToDataTable();
                ////detect row inserts - a row is in datatable2 except missing from datatable1
                //var exceptAB2 = qry2.Except(qry1);
                // dataOverage = (from a in datatable2.AsEnumerable()
                //                     join ab in exceptAB2 on a["empno"].ToString() equals ab.MobileNo
                //                     select a).CopyToDataTable();

                #endregion 
                 //CompareDataTable(setDataAccounting(), setDataInventory(), "empno","id", out dataOverage, out datadiff1, out datadiff2, out dataInventoryLoss);
                CompareLinQDataTable(setDataAccounting(), setDataInventory(), "empno", out dataOverage, out dataInventoryLoss);

                this.dataGridViewOverage.DataSource =dataOverage;
                this.dataGridViewInventoryLoss.DataSource = dataInventoryLoss;
                this.dataGridViewAdd.DataSource =datadiff1 ;
                this.dataGridViewDel.DataSource = datadiff2;
            }
            catch (Exception ex)
            {
                ex.Message.ToString();
            }


        }
 

        /// <summary>
        /// 比较两个DataTableCompare数据（结构相同）
        /// 涂聚文
        /// http://www.codeproject.com/Tips/344792/Compare-two-datatable-using-LINQ-Query
        /// </summary>
        /// <param name="datatable1"></param>
        /// <param name="datatable2"></param>
        /// <param name="keyField"></param>
        /// <param name="dataOverage"></param>
        /// <param name="dataInventoryLoss"></param>
        public static void CompareLinQDataTable(DataTable datatable1, DataTable datatable2, string keyField,out DataTable dataOverage,out DataTable dataInventoryLoss)
        {
            var qry1 = datatable1.AsEnumerable().Select(a => new { IdNo = a[keyField].ToString() });
            var qry2 = datatable2.AsEnumerable().Select(b => new { IdNo = b[keyField].ToString() });
            //detect row deletes - a row is in datatable1 except missing from datatable2
            var exceptAB1 = qry1.Except(qry2);
            dataInventoryLoss = (from a in datatable1.AsEnumerable()
                                 join ab in exceptAB1 on a[keyField].ToString() equals ab.IdNo
                                 select a).CopyToDataTable();
            //detect row inserts - a row is in datatable2 except missing from datatable1
            var exceptAB2 = qry2.Except(qry1);
            dataOverage = (from a in datatable2.AsEnumerable()
                           join ab in exceptAB2 on a[keyField].ToString() equals ab.IdNo
                           select a).CopyToDataTable();
        
        }

        /// <summary>
        /// 比较两个DataTableCompare数据（结构相同）
        /// 来源于:http://www.cnblogs.com/houlinbo/archive/2010/02/10/1667189.html
        /// </summary>
        /// <param name="dt1">来自数据库的DataTable</param>
        /// <param name="dt2">来自文件的DataTable</param>
        /// <param name="keyField">要比较的关键字段名</param>
        /// <param name="keyid">不需要比较的字段名id</param>
        /// <param name="dtRetAdd">新增数据（dt2中的数据）</param>
        /// <param name="dtRetDif1">不同的数据（数据库中的数据）</param>
        /// <param name="dtRetDif2">不同的数据（dt2中的数据,修改过的）</param>
        /// <param name="dtRetDel">删除的数据（dt2中的数据）</param>
        public static void CompareDataTable(DataTable dt1, DataTable dt2, string keyField,string keyid, out DataTable dtRetAdd, out DataTable dtRetDif1, out DataTable dtRetDif2,out DataTable dtRetDel)
        {
            //为三个表拷贝表结构
            dtRetDel = dt1.Clone();
            dtRetAdd = dtRetDel.Clone();
            dtRetDif1 = dtRetDel.Clone();
            dtRetDif2 = dtRetDel.Clone();

            int colCount = dt1.Columns.Count;

            DataView dv1 = dt1.DefaultView;
            DataView dv2 = dt2.DefaultView;

            //先以第一个表为参照，看第二个表是修改了还是删除了
            foreach (DataRowView dr1 in dv1)
            {
                dv2.RowFilter = keyField + " = ‘" + dr1[keyField].ToString() + "‘";
                if (dv2.Count > 0)
                {
                    if (!CompareUpdate(dr1, dv2[0]))//比较是否有不同的
                    {
                        dtRetDif1.Rows.Add(dr1.Row.ItemArray);//修改前
                        dtRetDif2.Rows.Add(dv2[0].Row.ItemArray);//修改后
                        dtRetDif2.Rows[dtRetDif2.Rows.Count - 1][keyid] = dr1.Row[keyid];//将ID赋给来自文件的表，因为它的ID全部==0
                        continue;
                    }
                }
                else
                {
                    //已经被删除的
                    dtRetDel.Rows.Add(dr1.Row.ItemArray);
                }
            }

            //以第一个表为参照，看记录是否是新增的
            dv2.RowFilter = "";//清空条件
            foreach (DataRowView dr2 in dv2)
            {
                dv1.RowFilter = keyField + " = ‘" + dr2[keyField].ToString() + "‘";
                if (dv1.Count == 0)
                {
                    //新增的
                    dtRetAdd.Rows.Add(dr2.Row.ItemArray);
                }
            }
        }

        /// <summary>
        /// 
        /// </summary>
        /// <param name="dr1"></param>
        /// <param name="dr2"></param>
        /// <returns></returns>
        private static bool CompareUpdate(DataRowView dr1, DataRowView dr2)
        {
            //行里只要有一项不一样，整个行就不一样,无需比较其它
            object val1;
            object val2;
            for (int i = 1; i < dr1.Row.ItemArray.Length; i++)
            {
                val1 = dr1[i];
                val2 = dr2[i];
                if (!val1.Equals(val2))
                {
                    return false;
                }
            }
            return true;
        }