How to explicitly convert type in Dynamic Linq Core?

I read the doc on Dynamic Linq Core here, where it says

The expression language allows explicit conversions using the syntax type (expr), where type is a type name optionally followed by ? and expr is an expression. This syntax may be used to perform the following conversions:

I’m having a hard type following this instruction, so far I tried

.Select("new (Key.Date, Key.t, Sum(cashflow) as Profit, (double)Sum(cashflow) as TestConvertType)");

and

.Select("new (Key.Date, Key.t, Sum(cashflow) as Profit, Sum(cashflow).type(double) as TestConvertType)");

and I got

“‘.’ or ‘(‘ or string literal expected”

I also tried:

.Select("new (Key.Date, Key.t, Sum(cashflow) as Profit, Convert.ToDouble(Sum(cashflow)) as TestConvertType)");

“LINQ to Entities does not recognize the method ‘System.Decimal ToDecimal(Double)’ method, and this method cannot be translated into a store expression.”

None worked. Can someone give me an example on how to explicitly convert type in Dynamic Linq?

Answer

ok got it.. just use Type(expression)

.Select("new (Key.Date, Key.t, Sum(cashflow) as Profit, Double(Sum(cashflow)) as TestConvertType)");