如何在Xamarin表单的Prism 7.2.0.1367中使用IDialogAware中的RequestClose

// 自定义对话框视图模型
public class CustomDialogViewModel : BindableBase, IDialogAware
{
    private string _title;
    public string Title
    {
        get { return _title; }
        set { SetProperty(ref _title, value); }
    }

    public event Action<IDialogParameters> RequestClose;

    public bool CanCloseDialog()
    {
        // 在这里可以添加关闭对话框的条件判断
        return true;
    }

    public void OnDialogClosed()
    {
        // 对话框关闭后的操作
    }

    public void OnDialogOpened(IDialogParameters parameters)
    {
        // 对话框打开后的操作
    }

    // 关闭对话框
    private void CloseDialog()
    {
        RequestClose?.Invoke(new DialogParameters());
    }
}

// 在视图中显示对话框
public class MainPageViewModel : BindableBase
{
    private readonly IDialogService _dialogService;

    public DelegateCommand ShowDialogCommand { get; }

    public MainPageViewModel(IDialogService dialogService)
    {
        _dialogService = dialogService;
        ShowDialogCommand = new DelegateCommand(ShowDialog);
    }

    private void ShowDialog()
    {
        var parameters = new DialogParameters();
        _dialogService.ShowDialog(nameof(CustomDialog), parameters, result =>
        {
            // 对话框关闭后的回调操作
        });
    }
}