linq where条件是方法的时候如何处理

linq where条件是方法的时候怎么处理
例如：

C# code

 var contracts = from c in db.B_Contract_Out                                join h in db.B_Hospital on c.HospitalID equals h.ID into ch                                where c.C4 == "1"                                where c.ContractDate>=startDate && c.ContractDate<=backDate// 想在这再加个条件 就是GetQianKuan(Convert.ToDouble(c.AllMoney), c.ID)!=0  怎么处理                                from chs in ch.DefaultIfEmpty()                                join u in db.sys_User on c.PrincipalUser equals u.UserID into cu                                from cus in cu.DefaultIfEmpty()                                orderby c.ContractDate descending                                join p in db.B_PayRecord on c.ID equals p.ContractID into cp                                from cps in cp.DefaultIfEmpty()                                where c.AllMoney != Convert.ToDouble(cps.PayMoney)                                orderby c.ContractDate descending                                                               select new { ArmNames = GetArmariumName(c.ID), ArmOutPrice = GetArmOutPrice(c.ID), c.ID, c.ContractDate, c.ContactNum, cus.U_CName, c.AllMoney, chs.HospitalName, qiankuan = GetQianKuan(Convert.ToDouble(c.AllMoney), c.ID) };

等待...

[解决办法]
或者这样：

var contracts = from c in db.B_Contract_Out
join h in db.B_Hospital on c.HospitalID equals h.ID into ch
where c.C4 == "1"
where c.ContractDate>=startDate && c.ContractDate<=backDate
from chs in ch.DefaultIfEmpty()
join u in db.sys_User on c.PrincipalUser equals u.UserID into cu
from cus in cu.DefaultIfEmpty()
orderby c.ContractDate descending
join p in db.B_PayRecord on c.ID equals p.ContractID into cp
from cps in cp.DefaultIfEmpty()
where c.AllMoney != Convert.ToDouble(cps.PayMoney)
orderby c.ContractDate descending
select new { ArmNames = GetArmariumName(c.ID), ArmOutPrice = GetArmOutPrice(c.ID), c.ID, c.ContractDate, c.ContactNum, cus.U_CName, c.AllMoney, chs.HospitalName, qiankuan = GetQianKuan(Convert.ToDouble(c.AllMoney), c.ID) };

contracts =contracts.ToList().Where(c=> GetQianKuan(Convert.ToDouble(c.AllMoney), c.ID)!=0);

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