动态KeyNotFoundException中确认提示的FormFlow

Question

SDK版本: 3.16.1.38846代码：.Net

问题描述

我们使用Field.SetDefine根据调用服务的值在实时字段中定义按钮。具体来说，我们有一个 Source 字段和目的字段，当用户完成表单时，根据服务的结果定义目标和源字段的按钮，但是在确认提示中单击No，他会得到以下异常：

未能填写表格。例外情况：给定的密钥在字典.中不存在

   at System.Collections.Generic.Dictionary`2.get_Item(TKey key)
   at Microsoft.Bot.Builder.FormFlow.Advanced.Field`1.ValueDescription(Object value)
   at Microsoft.Bot.Builder.FormFlow.Advanced.RecognizeEnumeration`1.<>c__DisplayClass2_0.<.ctor>b__0(Object value)
   at Microsoft.Bot.Builder.FormFlow.Advanced.RecognizeEnumeration`1.ValueDescription(Object value)
   at Microsoft.Bot.Builder.FormFlow.Advanced.Prompter`1.ValueDescription(IField`1 field, Object value, String format)
   at Microsoft.Bot.Builder.FormFlow.Advanced.Prompter`1.ExpandTemplate(String template, String currentChoice, String noValue, T state, IField`1 field, Object[] args, IList`1& buttons)
   at Microsoft.Bot.Builder.FormFlow.Advanced.Prompter`1.Prompt(T state, IField`1 field, Object[] args)
   at Microsoft.Bot.Builder.FormFlow.Advanced.NavigationField`1..ctor(String name, String startField, IForm`1 form, T state, FormState formState, Fields`1 fields)
   at Microsoft.Bot.Builder.FormFlow.Advanced.NavigationStep`1..ctor(String startField, IForm`1 form, T state, FormState formState)
   at Microsoft.Bot.Builder.FormFlow.FormDialog`1.<MessageReceived>d__16.MoveNext()
   --- End of inner exception stack trace ---

我们认为这可能是因为FormFlow代码试图访问字段的值，但是按钮列表发生了更改，现在列表中不再存在此值。

我怎样才能避免这个例外。

示例代码

复制问题的完整bot代码。

public class DynaForm
{
    public static ICollection<string> CustomerAccounts { get; set; }
    public string Destination { get; set; }
    public string source { get; set; }


    public static IForm<DynaForm> BuildFormAsync()
    {
        return new FormBuilder<DynaForm>()
            .Message("Welcome to the simple sandwich order bot!")
            .Field(new FieldReflector<DynaForm>(nameof(source))
                .SetType(null)
                .SetDefine((state, field) =>
                {
                foreach (var item in CustomerAccounts)
               {
                   field
                       .AddDescription(item,item)
                       .AddTerms(item, item);
               }
               return Task.FromResult(true);                   
                })             
                .SetPrompt(new PromptAttribute("Select the source account \n {||} \n") { ChoiceStyle = ChoiceStyleOptions.Buttons })
                .SetAllowsMultiple(false)
                )                  
            .Field(new FieldReflector<DynaForm>(nameof(Destination))
                .SetType(null)
                .SetDependencies(nameof(source))
                .SetDefine((state, field) =>
                {
                foreach (var item in CustomerAccounts)
                {
                  field
                    .AddDescription(item, item)
                    .AddTerms(item, item);
                }
                return Task.FromResult(true);
                })
                .SetPrompt(new PromptAttribute("Select the destination account \n {||} \n") { ChoiceStyle = ChoiceStyleOptions.Buttons })                 
                .SetAllowsMultiple(false)                 
                )
            .Confirm("Do you want to continue? {||}")           
            .Build();   
    }
}

预期行为

当用户在“确认提示”中选择“否”时，应显示表单字段，供用户选择要更改的字段。

在这里输入图像描述

Answer 1

我通过GitHub回复了你，因为看起来你有两次相同的问题：https://github.com/Microsoft/BotBuilder/issues/5060