禁用文本框的一堆动态使用单个复选框进行

Question

MainWindow.xaml

<CheckBox Content="Enable" Height="16" HorizontalAlignment="Left" Margin="190,40,0,0" Name="checkBox_Enable" VerticalAlignment="Top" IsChecked="True" Unchecked="checkBox_Enable_Unchecked" Checked="checkBox_Enable_Checked" /> 
    <Label Content="Fullscreen:" Height="15" HorizontalAlignment="Left" Margin="227,63,0,0" Name="label3" VerticalAlignment="Top" Width="56" Padding="1" /> 
    <TextBox HorizontalAlignment="Right" Margin="0,86,243,0" Name="textBox_Hotkey_Fullscreen" Width="33" Height="18" VerticalAlignment="Top" /> 
    <Label Content="Custom field:" HorizontalAlignment="Left" Margin="227,110,0,136" Name="label5" Padding="1" /> 
    <TextBox Height="18" HorizontalAlignment="Left" Margin="227,131,0,0" Name="textBox_Hotkey_Customfield" VerticalAlignment="Top" Width="33" /> 
    <Label Content="Window-related:" HorizontalAlignment="Left" Margin="227,155,0,87" Name="label4" Padding="1" /> 
    <TextBox HorizontalAlignment="Left" Margin="227,0,0,112" Name="textBox_Hotkey_Windowrelated" Width="33" Height="18" VerticalAlignment="Bottom" /> 

MainWindow.xaml.cs

private void checkBox_Enable_Unchecked(object sender, RoutedEventArgs e) 
    { 
     textBox_Hotkey_Fullscreen.IsEnabled = false; 
     textBox_Hotkey_Customfield.IsEnabled = false; 
     textBox_Hotkey_Windowrelated.IsEnabled = false; 
    } 

    //There are no problems after purging this function. However, the controls couldn't be "re-enabled", what obviously makes my concept pointless. 
    private void checkBox_Enable_Checked(object sender, RoutedEventArgs e) 
    { 

     textBox_Hotkey_Fullscreen.IsEnabled = true; 
     textBox_Hotkey_Customfield.IsEnabled = true; 
     textBox_Hotkey_Windowrelated.IsEnabled = true; 
    } 

为什么它抛出刚刚推出后的NullReferenceException？

Answer 1

为什么在启动后抛出NullReferenceException？

因为当CheckBox触发事件时并非所有控件都已加载。

---

我建议binding的CheckBox到布尔和结合其他控件IsEnabled到（或结合directly到CheckBox）。

Answer 2

我会建议使用像绑定（XAML中移除事件处理程序）

IsEnabled="{Binding ElementName=checkBox_Enable, Path=IsChecked}" 

为要启用/使用复选框来禁用所有的控制。