如何检查每月转入和转出的c＃linq

Question

我想通过 BCode 每月转移数据，并在表格中按月调出数据。当 BCode 发生变化时，我们可以确定该公司通过 BCode 转移到另一个类别，这意味着该公司已转移到该类别。

我希望转入并转出BCode = 1

表格

 | Id        Refno         TransactionDate       BCode     ReceiptDate             Total
 +------------------------------------------------------------------------------------------+
 | 70488974 K0702694    2014-01-01 00:00:00.000     1   2014-04-01 00:00:00.000   -1429,72 |
 | 72107868 K0731218    2014-01-01 00:00:00.000     1   2015-01-01 00:00:00.000   -4052,65 |
 | 70173504 K0770815    2014-01-01 00:00:00.000     23  2014-01-01 00:00:00.000   -706,46  |
 | 70578306 K0773716    2014-01-01 00:00:00.000     99  2014-01-01 00:00:00.000   -443,45  |
 | 70245176 K0702694    2014-02-01 00:00:00.000     1   2014-02-01 00:00:00.000   -1298,23 |
 | 72225353 K0731218    2014-02-01 00:00:00.000     1   2015-02-01 00:00:00.000   -987,44  |
 | 70942793 K0773716    2014-02-01 00:00:00.000     1   2014-05-01 00:00:00.000   -443,45  |
 | 70947050 K0770815    2014-02-01 00:00:00.000     1   2014-05-01 00:00:00.000   270,26   |
 | 70370825 K0702694    2014-03-01 00:00:00.000     1   2014-03-01 00:00:00.000   -1323,78 |
 | 70298756 K0770815    2014-03-01 00:00:00.000     23  2014-02-01 00:00:00.000   -697,49  |
 | 70578306 K0773716    2014-03-01 00:00:00.000     99  2014-04-01 00:00:00.000   -443,45  |
 | 71564379 K0731218    2014-03-01 00:00:00.000     13  2014-09-01 00:00:00.000   -2236,26 |

输出应该是这样的：

每月转移（2014年2月1日起）

| Refno      From BCode   Total |
+-------------------------------+
| K0770815    23        270,26  |
| K0773716    99       -443,45  |
+-------------------------------+

每月转出（2014年2月1日起）

| Refno      To BCode   Total |
+-------------------------------+
| K0770815    23        270,26  |
| K0773716    99        -443,45 |
| K0731218   13        -2236,26 |
+-------------------------------+

我当前的代码如下所示

public DataSet _getMTIO(DateTime startMonth, long bCode)
{
    var query_in = (from _in in _entities.Transactions
                    join _bcode in _entities.BCodes on _in.BCode equals _seta.SetaCode
                    where (_in.TransactionDate >= startMonth 
                    || startMonth == DateTime.MinValue)
                    && (_in.BCode == bCode || bCode < 0)
                    && !_entities.Transactions.Where(y => y.TransactionDate < startMonth)
                    .Select(y => y.Refno).Contains(_in.Refno)
                     select new
                     {
                         RefNo = _in.Refno,
                         FromBCode= _in.BCode,
                         Total = _in.Total
                     });

      var query_out = (from _out in _entities.LevyTransactions
                       join _bcode in _entities.BCodes on _in.BCode equals _seta.SetaCode
                       where (_in.TransactionDate >= startMonth 
                       || startMonth == DateTime.MinValue)
                       && (_out.BCode == bCode || bCode < 0)
                       && !_entities.Transactions.Where(y => y.TransactionDate > startMonth)
                       .Select(y => y.BCode).Contains(_out.BCode)
                       select new
                       {
                           RefNo = _out.Refno,
                           ToBCode= _out.BCode,
                           Total = _out.Total_out.Total
                       });
 }