C# WinForm中如何根据ComboBox选中值启用另一个ComboBox

WinForms 实现（C#） #

1. 窗体初始化时配置选项并绑定事件

private void Form1_Load(object sender, EventArgs e)
{
    // 给ComboBox1添加选项，第一项为默认值
    comboBox1.Items.AddRange(new string[] { "请选择", "选项1", "选项2", "选项3" });
    // 默认选中第一项
    comboBox1.SelectedIndex = 0;
    // 初始状态下禁用ComboBox2
    comboBox2.Enabled = false;
    // 绑定选中变化事件
    comboBox1.SelectedIndexChanged += ComboBox1_SelectedIndexChanged;
}

2. 处理ComboBox1的选中变化事件

private void ComboBox1_SelectedIndexChanged(object sender, EventArgs e)
{
    // 选中项不是第一项时启用ComboBox2，否则禁用
    comboBox2.Enabled = comboBox1.SelectedIndex != 0;
}

WPF 实现（后台代码方式） #

private void Window_Loaded(object sender, RoutedEventArgs e)
{
    comboBox1.ItemsSource = new List<string> { "请选择", "选项1", "选项2", "选项3" };
    comboBox1.SelectedIndex = 0;
    comboBox2.IsEnabled = false;
    comboBox1.SelectionChanged += ComboBox1_SelectionChanged;
}

private void ComboBox1_SelectionChanged(object sender, SelectionChangedEventArgs e)
{
    comboBox2.IsEnabled = comboBox1.SelectedIndex != 0;
}

WPF MVVM 实现 #

ViewModel 核心代码：

private string _selectedCombo1Item;
public string SelectedCombo1Item
{
    get => _selectedCombo1Item;
    set
    {
        _selectedCombo1Item = value;
        OnPropertyChanged();
        OnPropertyChanged(nameof(IsCombo2Enabled));
    }
}

// 通过绑定控制ComboBox2的启用状态
public bool IsCombo2Enabled => SelectedCombo1Item != "请选择";

// 实现INotifyPropertyChanged接口
public event PropertyChangedEventHandler PropertyChanged;
protected void OnPropertyChanged([CallerMemberName] string propertyName = null)
{
    PropertyChanged?.Invoke(this, new PropertyChangedEventArgs(propertyName));
}

XAML 绑定部分：

<ComboBox ItemsSource="{Binding Combo1Items}" SelectedItem="{Binding SelectedCombo1Item}" />
<ComboBox ItemsSource="{Binding Combo2Items}" IsEnabled="{Binding IsCombo2Enabled}" />

内容的提问来源于stack exchange，提问作者Mohd Sameer