将字符串映射到实体以与泛型方法一起使用 [英] map string to entity for using with generic method

问题描述

如果我有以下课程:

class Fruit {}
class Apple : Fruit {}
class Orange : Fruit {}

我有方法:

public List<Fruit> getFruit<T>() where T : Fruit {

 List<Fruit> fruitList = new List<Fruit>();
 return fruitList.AddRange(session.QueryOver<T>().List());

}

是否有可能将字符串映射为可以传递给此通用方法的类型的字典，以便我可以在正确的表上进行查询?

Is it possible to have a dictionary that maps a string to a type that can be passed to this generic method so I can query over the right table?

例如:

Dictionary<string, type> typeMapper = new Dictionary<string, type>()
{
 {"Apple", AppleType??}
};

var myType = typeMapper["Apple"];
List<Fruit> fruitList = getFruit<myType>();

推荐答案

如何使用字典存储委托?

How about using Dictionary to store delegates ?

    Dictionary<string, Func<List<Fruit>>> typeMapper = new Dictionary<string, Func<List<Fruit>>>()
    {
        {"Apple", () => { return getFruit<Apple>(); } },
        {"Orange", () => { return getFruit<Orange>(); } }
    };

    List<Fruit> fruitList = typeMapper["Apple"]();

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