如何在 Dynamic Linq Core 中显式转换类型？

Question

我阅读了关于 Dynamic Linq Core here 的文档，上面写着

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:

按照此说明，我很难打字，到目前为止我已经尝试过了

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

和

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

我得到了

"'.' or '(' or string literal expected"

我也试过：

.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 有效。有人可以给我一个关于如何在 Dynamic Linq 中显式转换类型的示例吗？

Answer 1

好的，知道了..只需使用 Type(expression)

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