Question

在大韩民国,我询问并看到了如何使用其名称建立一间班的问题。我的问题并不相同,因此我会问这个问题。

我的申请分为两类,即“A”和“B”。在另一个类别中,我需要使用这两个类别(第三类是外部服务机构要求的)。外部服务只能把两个“A”和“B”类的名称作为座标。在第三类中,我知道我可以做以下事情:

case "A":
    create an instance of A
case "B":
    create an instance of B

but that seems weird. I d like to do it dynamically so I was thinking of doing Activator.CreateInstance but not sure if it s good programming because it seems "CreateInstance" is used when you load an assembly remotely. In my case, everything is in one project.

任何建议? 谢谢你!

Answer 1

This is perfect case for using Factory Method pattern.

http://www.dofactory.com/Patterns/PatternFactory.aspx

Answer 2

If number of classes that you want to create by their name is limited (such as 2 different classes in your example), I would prefer the way with "switch"

public object ClassFactory(string ClassName)
{
    switch(ClassName)
    {
        case "A": return new A();
        case "B": return new B();
    }
}

因为它既快捷又更安全(如果班级的名称来自外部服务,想象会发生什么,如果这一服务会带来恶名)。

否则,启动者。创造活力不应造成任何问题,但应确保你彻底核实投入。

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