取两个DataTable的交集,删除重复数据

1

2

3

4

5

6

7

8

9

10

11

12

13

14

15

16

17

18

19

20

21

22

23

24

25

26

27

28

29

/// <summary>

        /// 取两个DataTable的交集,删除重复数据

        /// </summary>

        /// <param name="sourceDataTable">源DataTable</param>

        /// <param name="targetDataTable">目标DataTable</param>

        /// <param name="primaryKey">两个表的主键</param>

        /// <returns>合并后的表</returns>

        public
static DataTable Merge(DataTable sourceDataTable, DataTable targetDataTable, string
primaryKey)

        {

            if
(sourceDataTable != null
|| targetDataTable != null
|| !sourceDataTable.Equals(targetDataTable))

            {

                sourceDataTable.PrimaryKey = new
DataColumn[] { sourceDataTable.Columns[primaryKey] };

                DataTable dt = targetDataTable.Copy();

                foreach
(DataRow tRow in
dt.Rows)

                {

                    //拒绝自上次调用 System.Data.DataRow.AcceptChanges() 以来对该行进行的所有更改。

                    //因为行状态为DataRowState.Deleted时无法访问ItemArray的值

                    tRow.RejectChanges();

                    //在加载数据时关闭通知、索引维护和约束。

                    sourceDataTable.BeginLoadData();

                    //查找和更新特定行。如果找不到任何匹配行，则使用给定值创建新行。

                    DataRow temp = sourceDataTable.LoadDataRow(tRow.ItemArray, true);

                    sourceDataTable.EndLoadData();

                    sourceDataTable.Rows.Remove(temp);

                }

            }

            sourceDataTable.AcceptChanges();

            return
sourceDataTable;

        }