查找UI的命令模式示例 [英] Looking for example of Command pattern for UI

问题描述

我正在使用WinForm .Net应用程序与基本的UI，包括工具栏按钮，菜单项和按键，所有启动相同的底层代码。现在每个事件处理程序都调用一个通用的方法来执行这个函数。

I'm working on a WinForm .Net application with the basic UI that includes toolbar buttons, menu items and keystrokes that all initiate the same underlying code. Right now the event handlers for each of these call a common method to perform the function.

根据我看到的，这种类型的动作可以由命令设计模式，具有自动启用/禁用或检查/取消选中UI元素的额外优点。

From what I've read this type of action could be handled by the Command design pattern with the additional benefit of automatically enabling/disabling or checking/unchecking the UI elements.

我一直在网上搜索一个很好的示例项目，但真的没有找到一个。

I've been searching the net for a good example project, but really haven't found one. Does anyone have a good example that can be shared?

推荐答案

让我们先确认我们知道Command模式是什么：

Let's first make sure we know what the Command pattern is:

命令模式封装了一个请求
作为一个对象，并给它一个已知的
公共接口。命令模式
确保每个对象接收其
自己的命令，并在发送方和接收方之间提供解耦
。发送者
是调用
操作的对象，而接收者是接收请求并对
it起作用的对象
。

Command pattern encapsulates a request as an object and gives it a known public interface. Command Pattern ensures that every object receives its own commands and provides a decoupling between sender and receiver. A sender is an object that invokes an operation, and a receiver is an object that receives the request and acts on it.

这里有一个例子。有很多方法可以做到这一点，但我将采取一个接口基础方法，使代码更可测试的你。我不知道你喜欢什么语言，但我在C＃中写这个。

Here's an example for you. There are many ways you can do this, but I am going to take an interface base approach to make the code more testable for you. I am not sure what language you prefer, but I am writing this in C#.

首先，创建一个描述命令的界面。

First, create an interface that describes a Command.

public interface ICommand
{
    void Execute();
}

其次，创建将实现命令接口的命令对象。

Second, create command objects that will implement the command interface.

public class CutCommand : ICommand
{
    public void Execute()
    {
        // Put code you like to execute when the CutCommand.Execute method is called.
    }
}

第三，我们需要设置invoker或sender对象

Third, we need to setup our invoker or sender object.

public class TextOperations
{
    public void Invoke(ICommand command)
    {
        command.Execute();
    }
}

第四，创建将使用调用器的客户端对象/ sender对象。

Fourth, create the client object that will use the invoker/sender object.

public class Client
{
    static void Main()
    {
        TextOperations textOperations = new TextOperations();
        textOperation.Invoke(new CutCommand());
    }
}

我希望你能拿这个例子，用于您正在处理的应用程序。如果您想要更多说明，请告诉我们。

I hope you can take this example and put it into use for the application you are working on. If you would like more clarification, just let me know.

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