C# join使用DefaultIfEmpty（）返回0

我有一个查询包含多个左内部联接和返回列表 它与表PayrollTransactions连接，它返回o，因为它没有数据。通过此压缩，我需要在所有情况下都返回列表，即使第二个连接为空

        public List<PayrollElementsViewModel> GetAllPayrollRunDetails(int? PayrollrollRunID)
    {
          IQueryable<PayrollElementsViewModel> List =
                (from R in database.PayrollElements
                 where R.Deleted == false
                 && R.PayrollElementsPayrollRunID == PayrollrollRunID

                 join Emp in database.Employee on R.PayrollElementsIDEmployeeID equals Emp.EmployeeID
                 into g
                 from Emp in g.DefaultIfEmpty()

                 join tran in database.PayrollTransactions on Emp.EmployeeID equals tran.PayrollTransactionsEmployeeID
                 into g6
                 from tran in g6.DefaultIfEmpty()
                 where tran.PayrollTransactionsPayrollRunID == PayrollrollRunID

                 select new PayrollElementsViewModel
                 {
                     PayrollElementsPayrollRunID = PayrollrollRunID,
                     PayrollElementsEmployeeID = Emp.EmployeeID,
                     PayrollElementsEmployeeName = Emp.EmployeeName,
                     PayrollElementsEmployeeFingerPrint = Emp.EmployeeFingerPrint,
                     PayrollElementsStartDate = R.PayrollElementsStartDate,
                     PayrollElementsEndDate = R.PayrollElementsEndDate,
                     PayrollElemenTsransactionsValue = tran.PayrollTransactionsValue
                 });

            var results = List.ToList();
            return (results);
    }

public List GetAllPayrollRunDetails（int？PayrollRunId）
{
可查询列表=
（来自database.PayrollElements中的R）
其中R.Deleted==false
&&R.PayrollElementsPayrollRunID==PayrollRunId
在数据库中加入Emp。R.PayrollElementSideEmployeeId上的员工等于Emp.EmployeeID
进入g
来自g.DefaultIfEmpty（）中的Emp
在Emp.EmployeeID上的database.PayrollTransactions中加入tran等于tran.payrolltransactionemployeeid
加入g6
从g6.DefaultIfEmpty（）中的tran
其中tran.PayrollTransactionsPayrollRunID==PayrollRunId
选择new PayrollElementsViewModel
{
PayrollElementsPayrollRunID=PayrollRunId，
PayrollElementsEmployeeID=Emp.EmployeeID，
PayrollElementsEmployeeName=Emp.EmployeeName，
PayrollElementsEmployeeFingerPrint=Emp.EmployeeFingerPrint，
PayrollElementsStartDate=R.PayrollElementsStartDate，
PayrollElementsEndDate=R.PayrollElementsEndDate，
PayrollElementsTransactionsValue=tran.PayrollTransactionsValue
});
var results=List.ToList（）；
返回（结果）；
}

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我需要返回包含数据的列表，因为当使用PayrollTransaction的联接时，它返回0，如果它包含o

它通过将第二个联接中的条件移动到要选择的对象来解决

       join tran in database.PayrollTransactions on Emp.EmployeeID equals tran.PayrollTransactionsEmployeeID
             into g6
             from tran in g6.DefaultIfEmpty()

             select new PayrollElementsViewModel
             {
                 PayrollElemenTsransactionsValue = tran.PayrollTransactionsPayrollRunID == PayrollrollRunID?tran.PayrollTransactionsValue  : 0,
             });

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请使查询尽可能简单，以显示您的问题。请选中“编辑”复选框您得到了什么错误？第二次联接中的条件返回0，查询应大于0