c# - WPF 等效于 Winform 的 KeyEventArgs - 使用特定键调用 KeyDown 事件

Question

如何转换以下适用的代码Winforms以使其适用WPF：

  textBox1.Text = (input); 
  KeyEventArgs ev = new KeyEventArgs(Keys.Enter);
  textBox1_KeyDown(sender, ev);

我想KeyDown用特定的键调用事件，以便自动输入特定的值textBox1。

Answer 1

要订阅使用 WPF 的KeyDown-event 以TextBox在按下特定键时向其输入一些随机文本，您可以使用以下方法之一：

方法 1 - 使用 XAML 定义事件（您不需要手动订阅事件）：

XAML：

<Window x:Class="WpfApp1.MainWindow"
        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"
        xmlns:local="clr-namespace:WpfApp1"
        mc:Ignorable="d"
        Title="MainWindow" Height="450" Width="800">
    <Grid>

        <!-- define your TextBox and the KeyDown-event here -->
        <TextBox x:Name="MyTextBox" Width="120" Height="30" KeyDown="MyTextBox_KeyDown"/>

    </Grid>
</Window>

C#-代码：

using System.Windows;
using System.Windows.Input;

namespace WpfApp1
{
    public partial class MainWindow : Window
    {
        public MainWindow()
        {
            this.InitializeComponent();
        }

        private void MyTextBox_KeyDown(object sender, KeyEventArgs e)
        { 
            // if pressed key is "Enter", do something
            if (e.Key == Key.Enter)
            {
                this.MyTextBox.Text = "Some Text!";
            }
        }
    }
}

方法 2 - 定义事件并使用代码订阅它：

XAML：

<Window x:Class="WpfApp1.MainWindow"
        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"
        xmlns:local="clr-namespace:WpfApp1"
        mc:Ignorable="d"
        Title="MainWindow" Height="450" Width="800">
    <Grid>

        <!-- define your TextBox here -->
        <TextBox x:Name="MyTextBox" Width="120" Height="30"/>

    </Grid>
</Window>

C#-代码：

using System.Windows;
using System.Windows.Input;

namespace WpfApp1
{
    public partial class MainWindow : Window
    {
        public MainWindow()
        {
            this.InitializeComponent();
            this.MyTextBox.KeyDown += this.MyTextBox_KeyDown;
        }

        private void MyTextBox_KeyDown(object sender, KeyEventArgs e)
        { 
            // if pressed key is "Enter", do something
            if (e.Key == Key.Enter)
            {
                this.MyTextBox.Text = "Some Text!";
            }
        }
    }
}

KeyDown要使用特定键（此处：）调用-event，Key.Enter您可以使用：

using System;
using System.Windows.Interop;

KeyEventArgs enterPressedArgs = new KeyEventArgs(Keyboard.PrimaryDevice, new HwndSource(0, 0, 0, 0, 0, "", IntPtr.Zero), 0, Key.Enter);
this.MyTextBox_KeyDown(null, enterPressedArgs);