如何绑定在WPF命令 [英] How to Bind a Command in WPF

问题描述

有时我们用复杂的方式这么多次，我们忘了做任务最简单的方法。

Sometimes we used complex ways so many times, we forgot the simplest ways to do the task.

我知道该怎么做指挥约束力，但我总是用相同做法。

I know how to do command binding, but i always use same approach.

创建一个实现ICommand接口，并从视图模型我创建该类的新实例，并结合工程就像一个魅力的一类。

Create a class that implements ICommand interface and from the view model i create new instance of that class and binding works like a charm.

这是我用命令绑定

 public partial class MainWindow : Window
{
    public MainWindow()
    {
        InitializeComponent();
        DataContext = this;            
        testCommand = new MeCommand(processor);
    }

    ICommand testCommand;

    public ICommand test
    {
        get { return testCommand; }
    }
    public void processor()
    {
        MessageBox.Show("hello world");
    }
}

public class MeCommand : ICommand
{
    public delegate void ExecuteMethod();
    private ExecuteMethod meth;
    public MeCommand(ExecuteMethod exec)
    {
        meth = exec;
    }

    public bool CanExecute(object parameter)
    {
        return false;
    }

    public event EventHandler CanExecuteChanged;

    public void Execute(object parameter)
    {
        meth();
    }
}

但我想知道这样做的基本途径没有第三方dll的任何新类的创建。做这个简单的命令使用单一类绑定。实际的类从ICommand接口实现和完成的工作。

But i want to know the basic way to do this, no third party dll no new class creation. Do this simple command binding using a single class. Actual class implements from ICommand interface and do the work.

推荐答案

的Prism 已经提供的 Microsoft.P​​ractices.Prism.Commands.DelegateCommand

我不知道它是作为第三方。至少它的官方并记录在MSDN上。

I'm not sure is it considered as 3rd party. At least it's official and documented on MSDN.

一些原生内置的命令，例如复制，粘贴实现ICommand接口。
恕我直言继打开（用于扩展）/关闭（更改）的原则。这样我们就可以实现我们自己的命令。

Some native build-in commands such copy, paste implements ICommand interface. IMHO it following the Open(for extends)/Close(for changes) principle. so that we can implement our own command.

由于WPF指挥记载这里 ，摘录...

As WPF Commanding documented here, an excerpt...

WPF提供了一组预定义命令。如削，BrowseBack和
BrowseForward，播放，停止和暂停。

WPF provides a set of predefined commands. such as Cut, BrowseBack and BrowseForward, Play, Stop, and Pause.

如果在命令库类的命令不符合您的需求，
，那么你可以创建自己的命令。有两种方法来创建一个
自定义命令。首先是从地面启动和实施
中的ICommand接口。另一种方法，和更常见的做法，
是创建的的RoutedCommand 或 RoutedUICommand 。

If the commands in the command library classes do not meet your needs, then you can create your own commands. There are two ways to create a custom command. The first is to start from the ground up and implement the ICommand interface. The other way, and the more common approach, is to create a RoutedCommand or a RoutedUICommand.

我试过的RoutedCommand模式在开始和结束了与实施ICommand的。

I've tried RoutedCommand model at the beginning and ended up with implementing ICommand.

样品XAML绑定

<CommandBinding Command="{x:Static custom:Window1.CustomRoutedCommand}"
                    Executed="ExecutedCustomCommand"
                    CanExecute="CanExecuteCustomCommand" />

的RoutedCommand是不是从RoutedEvent不同。这似乎是一个更好的按钮的点击事件处理程序。它服务的宗旨：以单独的应用程序逻辑和观点，但需要一些附加的DependencyProperty或代码隐藏。

RoutedCommand is not different from RoutedEvent. this seems like a better button's 'Clicked' event handler. It serves the purpose: To separate app logic from View but require some attach DependencyProperty or code-behind.

我个人觉得更舒服只有实现我的ICommand的。

personally I feel more comfortable with just implement my ICommand.

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