WPF MVVM 模式覆盖对话框仅在视图（不是窗口）上

使用WPF MVVM模式覆盖对话框仅在视图（不是窗口）上

C#
// 定义视图模型
public class MainViewModel : INotifyPropertyChanged
{
    private bool isDialogVisible;
    public bool IsDialogVisible
    {
        get { return isDialogVisible; }
        set
        {
            if (isDialogVisible != value)
            {
                isDialogVisible = value;
                OnPropertyChanged(nameof(IsDialogVisible));
            }
        }
    }
    // 属性改变事件
    public event PropertyChangedEventHandler PropertyChanged;
    protected virtual void OnPropertyChanged(string propertyName)
    {
        PropertyChanged?.Invoke(this, new PropertyChangedEventArgs(propertyName));
    }
    // 命令绑定
    public ICommand ShowDialogCommand { get; }
    public MainViewModel()
    {
        // 初始化命令
        ShowDialogCommand = new RelayCommand(() =>
        {
            IsDialogVisible = true;
        });
    }
}
// 在视图中绑定对话框的可见属性
        xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
        xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
        xmlns:local="clr-namespace:MyApp"
        Title="Main Window" Height="450" Width="800">
    
        
        
    

C#
// 定义视图模型
public class MainViewModel
{
    public event EventHandler DialogClosed;
    // 命令绑定
    public ICommand ShowDialogCommand { get; }
    public MainViewModel()
    {
        // 初始化命令
        ShowDialogCommand = new RelayCommand(() =>
        {
            var dialogResult = ShowDialog();
            DialogClosed?.Invoke(this, new DialogResultEventArgs(dialogResult));
        });
    }
    // 显示对话框
    private bool ShowDialog()
    {
        var result = false;
        // 显示对话框逻辑
        return result;
    }
}
// 定义对话框结果事件参数
public class DialogResultEventArgs : EventArgs
{
    public bool DialogResult { get; }
    public DialogResultEventArgs(bool dialogResult)
    {
        DialogResult = dialogResult;
    }
}
// 在视图中订阅对话框结果事件
private void OnDialogClosed(object sender, DialogResultEventArgs e)
{
    var dialogResult = e.DialogResult;
    // 处理对话框结果逻辑
}
public MainWindow()
{
    InitializeComponent();
    var viewModel = new MainViewModel();
    viewModel.DialogClosed += OnDialogClosed;
    DataContext = viewModel;
}