C#:使用字符串字典，接口引用不同的类 [英] C#: Using a dictionary of string, interface to reference different classes

问题描述

我想创建一个字典，该字典使用字符串作为实例化对象的键.这是我字典的开头:

I would like to create a dictionary that uses strings as keys to instantiate objects. Here is the start of my dictionary:

Dictionary<string, ITerminalCommand> validInputs = new Dictionary<string, ITerminalCommand>()
{
    {"help",  TerminalCommandHelp},
    {"exit",  TerminalCommandExit},
};

这些终端命令类如下实现ITerminalCommand接口:

These terminal command classes implement the ITerminalCommand interface as such:

public class TerminalCommandHelp : MonoBehaviour, ITerminalCommand
{
    //contents of class correctly implementing interface
}

问题在于，当我声明并初始化字典时，出现错误提示

"TerminalCommandHelp"；是一种类型，在给定的条件下无效上下文.

"TerminalCommandHelp" is a type, which is not valid in the given context.

我认为接口可以抽象地用来表示从中实现的任何类吗?最终，当用户查找键时，我想创建该特定类的实例.有人可以指出我的误会吗?谢谢！

I thought interfaces could be use abstractly to represent any class that implements from it? Ultimately, when the user looks up a key, I want to create an instance of that particular class. Can someone point out my misunderstanding? Thank you!

推荐答案

//You are trying to pass their type not an instance.
Dictionary<string, ITerminalCommand> validInputs = new Dictionary<string, ITerminalCommand>()
    {
        {"help",  TerminalCommandHelp},
        {"exit",  TerminalCommandExit},
    };

//Initialize your types into objects and put those in your Dictionary.
IDictionary<string, ITerminalCommand> validInputs = new Dictionary<string, ITerminalCommand>()
    {
        {"help",  new TerminalCommandHelp()},
        {"exit",  new TerminalCommandExit()},
    };

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