从不同的ViewModels执行相同的棱镜命令 [英] Execute same Prism Command from different ViewModels

问题描述

是否有可能使用棱镜在WPF应用程序不同的ViewModels不知何故一个命令执行？

Is it possible to execute somehow one Command from a different ViewModels in the WPF application using Prism?

让我解释一下我的意思。

Let me explain what I mean.

我有MainMenuViewModel类：

I have the MainMenuViewModel class:

public class MainMenuViewModel
{
    private ICommand _aboutCommand;
    public ICommand AboutCommand
    {
        get
        {
            if (_aboutCommand == null)
            {
                _aboutCommand = new DelegateCommand(() => 
                    { MessageBox.Show("About menu item clicked!"); });
            }

            return _aboutCommand;
        }
    }
}

还没有为观这种模式：

also there is the View for this model:

<Menu IsMainMenu="True">
    <MenuItem Header="Nápověda">
        <MenuItem Header="O Aplikaci" x:Name="About" 
                  Command="{Binding AboutCommand}" />
    </MenuItem>
</Menu>

有是在应用程序的另一个模块，它应具有相同的行为执行命令（或甚至可能是更好的 - 同样的命令）：

There is another module in the application, which should execute the command with the same behavior (or even probably better - the same command):

public class MunisatorViewModel
{
    private ICommand _aboutCommandInAnotherModule;

    public ICommand AboutCommandInAnotherModule
    {
        get
        {
            if (_aboutCommandInAnotherModule== null)
            {
                _aboutCommandInAnotherModule= new DelegateCommand(() =>
                    { MessageBox.Show("About menu item clicked!"); });
            }

            return _aboutCommandInAnotherModule;
        }
    }
}

本模块具有查看：

<StackPanel Background="White" HorizontalAlignment="Center" VerticalAlignment="Top">
    <Button cmd:Click.Command="{Binding AboutCommandInAnotherModule}">About</Button>
</StackPanel>

是否有可能避免重复的代码？

Is it possible to avoid the duplicate code?

PS我明白了，我可以创建这个两的ViewModels基类，描述这个命令存在，但问题是，一些的ViewModels的早已不同的基类。

P.S. I understand, that I can create base class for this two ViewModels and describe this Commands there, but problem is, that some of the ViewModels has already different base classes.

推荐答案

使用的EventAggregator提出这样的事件。这可以让你有用户界面的不同区域之间的松耦合的沟通。

Use the EventAggregator to raise events like this. This allows you to have loosely coupled communication between different areas of the UI.

发布/订阅的概念，传递数据通过实施CompositeEvent对象效果很好。

The publish/subscribe concept, passing data through implementing a CompositeEvent object works well.

另外，你可以让你的命令静态和不同地区的访问，但似乎这并不是所有的美好。

Alternatively, you can make your command static and access it from different areas but this doesn't seem all that nice.

棱镜文档详细深入你的选择

希望有所帮助。

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