麻煩與對話鏈

Question

所以我有我打電話，像這樣這個對話框鏈...

public static readonly IDialog<string> dialog = Chain.PostToChain() 
     .Select(msg => msg.Text) 
     .Switch(
      new RegexCase<IDialog<string>>(new Regex("^hi", RegexOptions.IgnoreCase), (context, txt) => 
      { 
       return Chain.ContinueWith(new GreetingDialog(), 
         async (ctx, res) => 
         { 
          var token = await res; 
          var name = "User"; 
          context.UserData.TryGetValue<string>("Name", out name); 
          return Chain.Return($"You are logged in as: {name}"); 
         }); 
      }), 
      new DefaultCase<string, IDialog<string>>((context, txt) => 
      { 
       int count; 
       context.UserData.TryGetValue("count", out count); 
       context.UserData.SetValue("count", ++count); 
       string reply = string.Format("{0}: You said {1}", count, txt); 
       return Chain.Return(reply); 
      })) 
.Unwrap() 
.PostToUser(); 

對話框看起來像這樣

[Serializable] 
public class GreetingDialog : IDialog 
{ 
    public async Task StartAsync(IDialogContext context) 
    { 
     await context.PostAsync("Hi I'm John Bot"); 
     context.Wait(MessageReceivedAsync); 
    } 

    public async Task MessageReceivedAsync(IDialogContext context, IAwaitable<IMessageActivity> argument) 
    { 
     var message = await argument; 
     var userName = String.Empty; 
     var getName = false; 
     context.UserData.TryGetValue<string>("Name", out userName); 
     context.UserData.TryGetValue<bool>("GetName", out getName); 

     if (getName) 
     { 
      userName = message.Text; 
      context.UserData.SetValue<string>("Name", userName); 
      context.UserData.SetValue<bool>("GetName", false); 
     } 


     if (string.IsNullOrEmpty(userName)) 
     { 
      await context.PostAsync("What is your name?"); 
      context.UserData.SetValue<bool>("GetName", true); 
     } 
     else 
     { 
      await context.PostAsync(String.Format("Hi {0}. How can I help you today?", userName)); 
     } 
     context.Wait(MessageReceivedAsync); 
    } 
} 

，當我嘗試運行此我得到回來，說錯誤「：Microsoft.Bot.Builder.Internals.Fibers.ClosureCaptureException：異常，捕捉環境匿名方法閉包是不可序列，考慮取消環境捕獲或使用反射序列化代理」

有人能指出我在正確的方向？我不確定我在這裏做錯了什麼。

Answer 1

這個問題似乎是與下面的匿名方法：

async (ctx, res) => 
{ 
    var token = await res; 
    var name = "User"; 
    context.UserData.TryGetValue<string>("Name", out name); 
    return Chain.Return($"You are logged in as: {name}"); 
}); 

嘗試用替代的方法是更換：

return Chain.ContinueWith(new GreetingDialog(), AfterGreetingContinuation); 

private async static Task<IDialog<string>> AfterGreetingContinuation(IBotContext context, IAwaitable<object> res) 
{ 
    var token = await res; 
    var name = "User"; 
    context.UserData.TryGetValue<string>("Name", out name); 
    return Chain.Return($"You are logged in as: {name}"); 
} 

然而，考慮到延續方法不太可能直到用context.Done（）結束GreetingDialog爲止。