DataTable.Select 处理关联表数据

DataSet.Clone  会拷贝表结构，关联关系也会拷贝， 用Select 筛选后ImportRow 导入新的DataTable，然后处理关联DataTable

DataSet ds2 = dsSource.Clone();
            if (condition != "1 > 2")
            {
                foreach (DataRow dr in dsSource.Tables[].Select(condition))
                {
                    ds2.Tables[].ImportRow(dr);

                    //关联表数据处理
                    foreach (DataRelation relation in dsSource.Tables[].ChildRelations)
                    {
                        string relationTableName = relation.ChildTable.TableName;
                        DataRow[] relationRows = dr.GetChildRows(relation);

                        foreach (DataRow childRow in relationRows)
                        {
                            ds2.Tables[relationTableName].ImportRow(childRow);
                        }
                    }

                }
            }
            return ds2;