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c# - wpf中多个窗口上的KeyBinding

问题描述

我目前正在编写一个由主窗口组成的应用程序（这里的 DataContext 是我的一个类，MainWindowController），我在其中定义了这个 KeyBinding：

<Window.InputBindings>
    <KeyBinding Key="N" Modifiers="Control" Command="{Binding Path=NewProgramCommand}"/>
    <KeyBinding Key="O" Modifiers="Control" Command="{Binding Path=OpenProgramCommand}"/>
    <KeyBinding Key="S" Modifiers="Control" Command="{Binding Path=SaveProxyCommand}"/>
    <KeyBinding Key="W" Modifiers="Control" Command="{Binding Path=CloseProxyCommand}"/>
</Window.InputBindings>

我可以从我的主窗口打开其他窗口。我已经定义了一个抽象类 AbstractWindow: Window 来处理应用程序关闭等。我的另一个窗口被创建为 AbstractWindows

<window:AbstractWindow x:Class="FinancialViewModule.FinancialView"
         xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
         xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
         xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006" 
         xmlns:d="http://schemas.microsoft.com/expression/blend/2008"
         Height="800" Width="1280"
         d:DesignHeight="300" d:DesignWidth="300">

当用户单击按钮时，命令会创建新窗口。

 mController.FinancialView = new FinancialView();
 mController.FinancialView.Show();

我希望我的 KeyBindings 可以在所有窗口中工作，所以在 AbstractWindow 构造函数中，我有：

InputBindings.AddRange(Application.Current.MainWindow.InputBindings);

快捷方式可在 FinancialView 窗口中使用，但输出中有错误：

System.Windows.Data Error: 2 : Cannot find governing FrameworkElement or FrameworkContentElement for target element. BindingExpression:Path=NewProgramCommand; DataItem='MainWindowController' (HashCode=37314933); target element is 'KeyBinding' (HashCode=38008833); target property is 'Command' (type 'ICommand')
System.Windows.Data Error: 2 : Cannot find governing FrameworkElement or FrameworkContentElement for target element. BindingExpression:Path=OpenProgramCommand; DataItem='MainWindowController' (HashCode=37314933); target element is 'KeyBinding' (HashCode=5210297); target property is 'Command' (type 'ICommand')
System.Windows.Data Error: 2 : Cannot find governing FrameworkElement or FrameworkContentElement for target element. BindingExpression:Path=SaveProxyCommand; DataItem='MainWindowController' (HashCode=37314933); target element is 'KeyBinding' (HashCode=34357331); target property is 'Command' (type 'ICommand')
System.Windows.Data Error: 2 : Cannot find governing FrameworkElement or FrameworkContentElement for target element. BindingExpression:Path=CloseProxyCommand; DataItem='MainWindowController' (HashCode=37314933); target element is 'KeyBinding' (HashCode=41051448); target property is 'Command' (type 'ICommand')

我能做些什么来避免这个错误？有没有更好的方法让应用程序的所有窗口都使用相同的快捷方式？

标签： c#wpfxamlkey-bindings

解决方案

在每个窗口实例中创建新的键绑定：

KeyBinding n = new KeyBinding() { Modifiers = ModifierKeys.Control, Key = Key.N };
KeyBinding o = new KeyBinding() { Modifiers = ModifierKeys.Control, Key = Key.O };
KeyBinding s = new KeyBinding() { Modifiers = ModifierKeys.Control, Key = Key.S };
KeyBinding w = new KeyBinding() { Modifiers = ModifierKeys.Control, Key = Key.W };
BindingOperations.SetBinding(n, InputBinding.CommandProperty, new Binding("NewProgramCommand"));
BindingOperations.SetBinding(o, InputBinding.CommandProperty, new Binding("OpenProgramCommand"));
BindingOperations.SetBinding(s, InputBinding.CommandProperty, new Binding("SaveProxyCommand"));
BindingOperations.SetBinding(w, InputBinding.CommandProperty, new Binding("CloseProxyCommand"));
InputBindings.AddRange(new KeyBinding[4] { n, o, s, w });

...并确保将每个窗口设置DataContext为MainWindowController定义命令的类型或任何类型。

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