Refactor long switch statement(重构长 switch 语句)

本文介绍了重构长 switch 语句的处理方法，对大家解决问题具有一定的参考价值，需要的朋友们下面随着小编来一起学习吧！

问题描述

我是 c# 中的程序，您通过口述命令来控制它，所以现在我有一个很长的 switch 语句.类似的东西

I'm program in c# which you controlling by dictating command so now i have a long switch statement. Something like

switch (command)

{
    case "Show commands":
        ProgramCommans.ShowAllCommands();
        break;
    case "Close window":
        ControlCommands.CloseWindow();
        break;
    case "Switch window":
        ControlCommands.SwitchWindow();
        break;
}

等等

几乎所有情况都只调用一种方法，方法不在一个类中，它们分布在许多类中.所以问题是，我怎样才能将这个开关重构为更优雅的方式?

Almost all cases call only one method, methods are not in one class they are distributed in many classes. So the question is, how i could refactor this switch to more elegant way?

推荐答案

你可以这样做来重构你的 switch 语句:

You can do this to refactor your switch statement:

var commands = new Dictionary<string, Action>()
{
    { "Show commands", () => ProgramCommans.ShowAllCommands() },
    { "Close window", () => ControlCommands.CloseWindow() },
    { "Switch window", () => ControlCommands.SwitchWindow() },
};

if (commands.ContainsKey(command))
{
    commands[command].Invoke();
}

这种方法的主要优点是您可以在运行时更改开关".

The main advantage to this approach is that you can change the "switch" at run-time.

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