條件實體框架查詢字段

Question

var employeePayDetails = (from p in Catalog.Providers 
          where p.Key == providerKey 
          from a in p.Appointments 
          from e in a.Employee.Services 
          from l in a.Allocations 
          from ip in l.InvoicePayments 
          where (a.Employee != null && a.Created >= begin && a.Created <= end)      where (e.Service.Id==l.Service.Id) 
          select new 
          { 
          ServiceName = l.Service, 
          CustomersServiced = l.Pet.Name + " " + a.Owner.LastName, 
          AppointmentDate = a.Created, 
          EmployeeName = a.Employee.Name, 
          PaymentOptionType = e.PaymentOption, 
          RateValue = e.Rate, 
          WorkedHours=l.End-l.Start, 
          PayAmount= ? 

          }).ToList(); 

在上述實體框架查詢我需要根據下文提到的開關語句來計算PayAmount。

switch (PaymentOption) 
     { 
      case 1: 
       PayAmount= WorkedHours * RateValue ; 
       break; 
      case 2: 
       PayAmount = RateValue ; 
       break; 
      case 3: 
       PayAmount = LatestTotal ; 
       break; 
     } 

所以我怎麼可能把上面switch語句價值，爲實體框架查詢爲PayAmount？

Answer 1

標準if應該工作：

PayAmount= (e.PaymentOption == 1 ? (l.End-l.Start) * e.Rate : (e.PaymentOption == 2 ? e.Rate : LatestTotal))