在 FormFlow、BotFramework 中使用 List<T> 时缺少第一个选项

Question

我通过查看指南 https://docs.botframework.com/en-us/csharp/builder/sdkreference/forms.html 编写了一个 FormFlow 演示，它运行良好。在演示 "Simple Sandwich Bot" , Sandwich.cs 中，有 enum:

public List Toppings;

public List Sauce;

public enum ToppingOptions
{
    Avocado, BananaPeppers, Cucumbers, GreenBellPeppers, Jalapenos,
    Lettuce, Olives, Pickles, RedOnion, Spinach, Tomatoes
};

public enum SauceOptions
{
    ChipotleSouthwest, HoneyMustard, LightMayonnaise, RegularMayonnaise,
    Mustard, Oil, Pepper, Ranch, SweetOnion, Vinegar
};

当密码为运行时，选择ToppingOptions和SauceOptions，第一个选项是 missing.Is 这是一个错误？ a picture to show the result

Answer 1

首先，在示例中，他们将列表声明为 'ToppingOptions' 值，仅使用 List<ToppingOptions> 而不是 List，如果仍然不起作用，请尝试更改枚举的第一个值并将其设置为 1，并保持其他值不变

public enum ToppingOptions
{
    Avocado = 1, BananaPeppers, Cucumbers, GreenBellPeppers, Jalapenos,
    Lettuce, Olives, Pickles, RedOnion, Spinach, Tomatoes
};

public enum SauceOptions
{
    ChipotleSouthwest = 1, HoneyMustard, LightMayonnaise, RegularMayonnaise,
    Mustard, Oil, Pepper, Ranch, SweetOnion, Vinegar
};

正如您在评论中所说，指南描述如下："If a field is based on an enum and it is not nullable, then the 0 value in the enum is considered to be null and you should start your enumeration at 1."

在 FormFlow、BotFramework 中使用 List<T> 时缺少第一个选项

Missing the first option when use List<T> in FormFlow,BotFramework

c#

botframework