C#：使用字符串字典，接口引用不同类

Question

我想创建一个字典，它使用字符串作为键来实例化对象。这是我字典的开头：

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

这些终端命令 classes 实现了 ITerminalCommand 接口：

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

问题是当我声明和初始化我的字典时，我收到一条错误消息

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

我认为可以抽象地使用接口来表示从它实现的任何 class？最终，当用户查找一个键时，我想创建那个特定 class 的实例。有人可以指出我的误解吗？谢谢！

Answer 1

//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()},
    };

C#：使用字符串字典，接口引用不同类

C#: Using a dictionary of string, interface to reference different classes

c#

polymorphism

inheritance

implementation

interface