麻烦与对话链

Question

所以我有我打电话，像这样这个对话框链...

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(); 

对话框看起来像这样

[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); 
    } 
} 

，当我尝试运行此我得到回来，说错误“：Microsoft.Bot.Builder.Internals.Fibers.ClosureCaptureException：异常，捕捉环境匿名方法闭包是不可序列，考虑取消环境捕获或使用反射序列化代理”

有人能指出我在正确的方向？我不确定我在这里做错了什么。

Answer 1

这个问题似乎是与下面的匿名方法：

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}"); 
}); 

尝试用替代的方法是更换：

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，考虑到延续方法不太可能直到用context.Done（）结束GreetingDialog为止。