如何申报其其类型在C＃用户定义的一个实例 [英] How to declare an instance which its type is user-defined in C#

问题描述

只要我的问题是有关定义在运行时的一个实例的类型，该类型是用户定义的。 东西看起来是这样的：

Simply my question is about defining the type of an instance in run time, and this type is user-defined. Something which looks like this:

Type instance1;

在运行时，用户会选择如INT，则会是，

In run time, the user is going to choose for example "int", then there 'll be,

int instance1;

任何建议？在向下转换效率吗？

Any suggestions?? is downCasting efficient here?

推荐答案

你在寻找什么是仿制药。阅读介绍这里。

What you are looking for are generics. Read an introduction here.

例如你声明类，希望该用户定义的类型是，这样的：

For example you would declare the class, you want that user defined type to be in, like that:

class MyClass<T>
{
    private T instance1 = default(T);

    public MyClass(T initalvalue)
    {
        instance1 = initalvalue;
    }

    //... some more code
}

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