命令模式：如何将参数传递到一个命令？ [英] Command Pattern : How to pass parameters to a command?

问题描述

我的问题是有关命令模式，在那里我们有以下的抽象（C＃代码）：

My question is related to the command pattern, where we have the following abstraction (C# code) :

public interface ICommand
{
    void Execute();
}

让我们以一个简单的具体命令，其目的是从我们的应用程序中删除一个实体。 A 人实例，例如

Let's take a simple concrete command, which aims to delete an entity from our application. A Person instance, for example.

我将有一个 DeletePersonCommand ，它实现了的ICommand 。此命令需要在人删除作为参数，以便删除它时，执行方法被调用。

I'll have a DeletePersonCommand, which implements ICommand. This command needs the Person to delete as a parameter, in order to delete it when Execute method is called.

什么是管理命令，参数化的最佳方式？如何将参数传递到命令，执行它们之前？

What is the best way to manage parametrized commands ? How to pass parameters to commands, before executing them ?

推荐答案

您需要的参数与命令对象相关联，无论是通过构造函数或setter注入（或同等学历）。也许是这样的：

You'll need to associate the parameters with the command object, either by constructor or setter injection (or equivalent). Perhaps something like this:

public class DeletePersonCommand: ICommand
{
     private Person personToDelete;
     public DeletePersonCommand(Person personToDelete)
     {
         this.personToDelete = personToDelete;
     }

     public void Execute()
     {
        doSomethingWith(personToDelete);
     }
}

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