如何在bot框架C#中使用枚举类别和子类别？

public enum Category
{
    Category1,
    Category2,
    Category3
}

public enum SubCategory
{
    SubCategory1,
    SubCategory2,
    SubCategory3
}

public async Task<DialogTurnResult> AskCategoryStepAsync(WaterfallStepContext stepContext, CancellationToken cancellationToken)
{
    return await stepContext.PromptAsync("categoryPrompt", new PromptOptions
    {
        Prompt = MessageFactory.Text("Please select a category:"),
        Choices = ChoiceFactory.ToChoices(Enum.GetNames(typeof(Category)))
    }, cancellationToken);
}

public async Task<DialogTurnResult> AskSubCategoryStepAsync(WaterfallStepContext stepContext, CancellationToken cancellationToken)
{
    stepContext.Values["category"] = ((FoundChoice)stepContext.Result).Value;

    return await stepContext.PromptAsync("subCategoryPrompt", new PromptOptions
    {
        Prompt = MessageFactory.Text("Please select a subcategory:"),
        Choices = ChoiceFactory.ToChoices(Enum.GetNames(typeof(SubCategory)))
    }, cancellationToken);
}

public async Task<DialogTurnResult> ProcessSelectionStepAsync(WaterfallStepContext stepContext, CancellationToken cancellationToken)
{
    var category = (string)stepContext.Values["category"];
    var subCategory = ((FoundChoice)stepContext.Result).Value;

    // 根据类别和子类别执行相应的操作
    // ...

    return await stepContext.EndDialogAsync(null, cancellationToken);
}