SDK 版本:3.16.1.38846 代码:.Net
问题描述
我们使用 Field.SetDefine 根据调用服务获得的值实时定义字段按钮。具体来说,我们有一个Source字段和一个Destination字段,Destination 和 Source 字段的按钮是根据服务的结果定义的例外:
未能完成表格。例外:给定的键不在字典中。
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 代码试图访问该字段的值,但按钮列表发生了变化,现在该值不再存在于列表中。
我怎样才能避免这个异常。
示例代码
重现问题的完整机器人代码。
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
当用户在确认提示时选择否时,应显示表单字段供用户选择要更改的字段。