[WPF]如何在程式中加入Hot key event

假設今天我想要讓使用者Hot key(如Alt) trigger程式做事情的時候

我們可以編寫UI的xaml

加入  PreviewKeyDown　事件的handler
並實作他

Step 1. Add event handler

<Window         xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"         xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"         xmlns:d="http://schemas.microsoft.com/expression/blend/2008"         xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006" mc:Ignorable="d"         xmlns:conv="clr-namespace:Solution.Converter"         x:Class="Solution.MainWindow"         WindowState="Maximized" WindowStyle="None"         SnapsToDevicePixels="True"         d:DesignWidth="800" d:DesignHeight="600"         Loaded="Window_Loaded"         PreviewKeyDown="Window_PreviewKeyDown"

Step 2. Implement event handler

// Release the Alt key         private void Window_PreviewKeyUp(object sender, System.Windows.Input.KeyEventArgs e)         {             if (e.SystemKey == Key.LeftAlt || e.SystemKey == Key.RightAlt)               ｛ //implement....｝         }