在 WPF 中创建键绑定 [英] Create Key binding in WPF

问题描述

我需要为 Window 创建输入绑定.

I need to create input binding for Window.

public class MainWindow : Window
{
    public MainWindow()
    {
        SomeCommand = ??? () => OnAction();
    }

    public ICommand SomeCommand { get; private set; }

    public void OnAction()
    {
        SomeControl.DoSomething();
    }
}

<小时>

<Window>
    <Window.InputBindings>
        <KeyBinding Command="{Binding SomeCommand}" Key="F5"></KeyBinding>
    </Window.InputBindings>
</Window>

如果我用一些 CustomCommand : ICommand 初始化 SomeCommand 它不会触发.SomeCommand 属性 getter 永远不会被调用.

If I init SomeCommand with some CustomCommand : ICommand it doesn't fire. SomeCommand property getter is never called.

推荐答案

对于你的情况最好使用 MVVM 模式

For your case best way used MVVM pattern

XAML:

<Window>
    <Window.InputBindings>
        <KeyBinding Command="{Binding SomeCommand}" Key="F5"/>
    </Window.InputBindings>
</Window>

背后的代码:

public partial class MainWindow : Window
{
    public MainWindow()
    {
        InitializeComponent();
    }
}

在您的视图模型中:

public class MyViewModel
{
    private ICommand someCommand;
    public ICommand SomeCommand
    {
        get
        {
            return someCommand 
                ?? (someCommand = new ActionCommand(() =>
                {
                    MessageBox.Show("SomeCommand");
                }));
        }
    }
}

然后你需要一个 ICommand 的实现.这个简单有用的课程.

Then you'll need an implementation of ICommand. This simple helpful class.

public class ActionCommand : ICommand
{
    private readonly Action _action;

    public ActionCommand(Action action)
    {
        _action = action;
    }

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

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

    public event EventHandler CanExecuteChanged;
}   

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