Question

我试图这样做:

void someMethod(TypeA object) { ... }

void someMethod(TypeB object) { ... }

object getObject()
{
    if (...) return new TypeA();
    else return new TypeB();
}

object obj = getObject();
(obj.GetType()) obj;  // won t compile
someMethod(obj);

显然,我在这里混淆不清。我知道,我可以通过仅写有条件声明来完成这项工作。

if (obj.GetType() == typeof(TypeA)) obj = (TypeA)obj;
else if (obj.GetType() == typeof(TypeB)) obj = (TypeB)obj;

——但现在还未采取某种行动?

EDIT I agree it seems like perhaps not the best design choice, so here s the context. The point of the above code is Repository base class for Mongo DB. I want it to be able to handle different kinds of tables. So, someMethod() is actually remove; and TypeA and TypeB are ObjectID and Guid; the code at the bottom is part of a type-agnostic remove method that accepts the ID as a string; and getObject() is a method to parse the ID parameter.

Answer 1

如果您重新使用NET 4和C# 4,可为此使用dynamic:

dynamic obj = GetObject();
SomeMethod(obj);

否则,你不得不利用思考来寻找和援引正确的方法。载重分辨率(非<条码>>动力学类型)在compile<>-time进行。

(请注意,除非<代码>TypeA和TypeB均为指示,否则,请在un Box<>m> 页: 1

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