C# 无法隐式转换类型';系统Linq.IQueryable<;匿名类型#6>';至';十进制';
你好,我有一个linq查询,如下所示:C# 无法隐式转换类型';系统Linq.IQueryable<;匿名类型#6>';至';十进制';,c#,linq,C#,Linq,你好,我有一个linq查询,如下所示: var data = from d in db.DailyBonus where d.Date>= startDate1 && d.Date<=endDate1 group d by new { Em = d.Employee.Id } into g select new BasisViewModel
var data = from d in db.DailyBonus
where d.Date>= startDate1 && d.Date<=endDate1
group d by new { Em = d.Employee.Id } into g
select new BasisViewModel
{
EmployeeId = g.Key.Em,
EmployeeNumber = g.FirstOrDefault().Employee.EmployeeNumber,
FullName = g.FirstOrDefault().Employee.FullName,
HK1 = (decimal)g.FirstOrDefault().ManDays,
Basis1 = (decimal)g.FirstOrDefault().BonusBase,
HK2 = (
(from d in db.DailyBonus
where d.Date>= startDate2 && d.Date<=endDate2
group d by new { Em = d.Employee.Id } into g2
select new
{
Mandays = g.FirstOrDefault().ManDays <-- this is decimal type
}
),
};
var data=来自d,单位为db.DailyBonus
其中d.Date>=startDate1&&d.Date=startDate2&&d.Date而不是返回匿名类(new{…}
)
而不是返回匿名类(new{…}
)
最后应添加另一个FirstOrDefault()
,并使用简单值而不是匿名类型:
var data = from d in db.DailyBonus
where d.Date>= startDate1 && d.Date<=endDate1
group d by new { Em = d.Employee.Id } into g
select new BasisViewModel
{
EmployeeId = g.Key.Em,
EmployeeNumber = g.FirstOrDefault().Employee.EmployeeNumber,
FullName = g.FirstOrDefault().Employee.FullName,
HK1 = (decimal)g.FirstOrDefault().ManDays,
Basis1 = (decimal)g.FirstOrDefault().BonusBase,
HK2 = (
(from d in db.DailyBonus
where d.Date>= startDate2 && d.Date<=endDate2
group d by new { Em = d.Employee.Id } into g2
select g.FirstOrDefault().ManDays <-- this is simple value now
).FirstOrDefault(),<--this is another first or default
};
var data=来自d,单位为db.DailyBonus
其中d.Date>=startDate1&&d.Date=startDate2&&d.Date您应该在最后添加另一个FirstOrDefault()
,并使用简单值而不是匿名类型:
var data = from d in db.DailyBonus
where d.Date>= startDate1 && d.Date<=endDate1
group d by new { Em = d.Employee.Id } into g
select new BasisViewModel
{
EmployeeId = g.Key.Em,
EmployeeNumber = g.FirstOrDefault().Employee.EmployeeNumber,
FullName = g.FirstOrDefault().Employee.FullName,
HK1 = (decimal)g.FirstOrDefault().ManDays,
Basis1 = (decimal)g.FirstOrDefault().BonusBase,
HK2 = (
(from d in db.DailyBonus
where d.Date>= startDate2 && d.Date<=endDate2
group d by new { Em = d.Employee.Id } into g2
select g.FirstOrDefault().ManDays <-- this is simple value now
).FirstOrDefault(),<--this is another first or default
};
var data=来自d,单位为db.DailyBonus
其中d.Date>=startDate1&&d.Date=startDate2&&d.Date HK2的架构是什么?您需要确保g.FirstOrDefault()
不会为空。如果可以-那么有一天你会得到NullReferenceException
HK2的模式是什么?你需要确保g.FirstOrDefault()
不会为空。如果可以-那么有一天你会得到NullReferenceException
1:)假设HK2是十进制类型,那么它很短很简单,不是复杂类型现在错误更改为无法将db.DailyBonus中的d中的类型“System.Linq.IQueryable”隐式转换为“decimal”
,其中d.Date>=startDate2&&d。Date@Mamen:看来,HK2
只是一个Decimal
,因此,您必须从整个查询中提取一项;i、 e.HK2=(…).FirstOrDefault()代码>简短且简单假设HK2是十进制类型,而不是复杂类型现在错误更改为无法将类型“System.Linq.IQueryable”隐式转换为“decimal”
从db.DailyBonus中的d转换为d,其中d.Date>=startDate2&&d。Date@Mamen字体看起来,HK2
只是一个Decimal
,因此您必须从整个查询中提取一项;i、 e.HK2=(…).FirstOrDefault()代码>
var data = from d in db.DailyBonus
where d.Date>= startDate1 && d.Date<=endDate1
group d by new { Em = d.Employee.Id } into g
select new BasisViewModel
{
EmployeeId = g.Key.Em,
EmployeeNumber = g.FirstOrDefault().Employee.EmployeeNumber,
FullName = g.FirstOrDefault().Employee.FullName,
HK1 = (decimal)g.FirstOrDefault().ManDays,
Basis1 = (decimal)g.FirstOrDefault().BonusBase,
HK2 = (
(from d in db.DailyBonus
where d.Date>= startDate2 && d.Date<=endDate2
group d by new { Em = d.Employee.Id } into g2
select g.FirstOrDefault().ManDays <-- this is simple value now
).FirstOrDefault(),<--this is another first or default
};