使用表达式求值器在多个 Enumerable 上执行动态 LINQ 字符串 - DLR / NCalc / Flee？

Question

我有一个具有属性的通用对象：

Class MyObject
{
    public Dictionary<string, Object> properties = new Dictionary<string, Object>();
    public object this[string name] { get { return properties[name]: null; }
}
List<MyObject> People= new List<MyObject>();
People.Add(new MyObject(age = 50, home = "Dublin", name = "Bob", Income = "50"));
People.Add(new MyObject(age = 45, home = "London", name = "Tim", Income = "90"));

List<MyObject> Cities= new List<MyObject>();
Cities.Add(new MyObject(City = "Dublin", Country = "IE"));
Cities.Add(new MyObject(City = "London", Country = "UK"));

我希望能够使用 Linq 查询这些枚举，但这些查询是动态并且是字符串形式，例如

People.
Where(a["age"] > 45 && Cities.Where(b["Country"] == "IE").Contains(a["home"]).
Sum(c["Income"])

有什么建议吗？我目前正在使用 Ncalc 以及许多调用 Linq 代码的 switch 语句...

Answer 1

看看 动态 Linq