Telegram Bot 停止并在 mscorlib.dll 中发生“System.AggregateException”类型的未处理异常

Question

我使用 C# 编写了一个简单的 Windows 应用程序，用于使用 Telegram Bots API 管理 Telegram 机器人 以前它工作正常。但最近它不起作用并将自动关闭。当我在调试模式下运行它时，它说：An unhandled exception of type 'System.AggregateException' occurred in mscorlib.dll 并参考这一行：Telegram.Bot.Types.Update[] update = bot.GetUpdatesAsync(offset).Result;

我的应用程序的完整代码在这里：

using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using System.Windows.Forms;
using System.Threading;

namespace bot_test1
{
    public partial class Form1 : Form
    {
        private static string Token = "";
        private Thread botThread;
        Telegram.Bot.TelegramBotClient bot;
        public Form1()
        {
            InitializeComponent();
        }

        private void Form1_Load(object sender, EventArgs e)
        {
        }

        private void btnStart_Click(object sender, EventArgs e)
        {
            Token = txtToken.Text;
            botThread = new Thread(new ThreadStart(runBot));
            botThread.Start();
        }

        void runBot()
        {
            bot = new Telegram.Bot.TelegramBotClient(Token);
            this.Invoke(new Action(() =>
            {
                lblStatus.Text = "Online";
                lblStatus.ForeColor = Color.Green;
            }));
            int offset = 0;

            while (true)
            {
                Telegram.Bot.Types.Update[] update = bot.GetUpdatesAsync(offset).Result;
                foreach (var up in update)
                {
                    offset = up.Id + 1;
                    if (up.Message == null)
                        continue;

                    var text = up.Message.Text;
                    var from = up.Message.From;
                    var chatId = up.Message.Chat.Id;

                    if (text.Contains("/start"))
                    {
                        StringBuilder sb = new StringBuilder();
                        sb.AppendLine(from.Username + " Welcome to this bot!");
                        bot.SendTextMessageAsync(chatId, sb.ToString());
                    }
                }
            }
        }

        private void Form1_FormClosing(object sender, FormClosingEventArgs e)
        {
            botThread.Abort();
        }
    }
}

我找不到问题所在。我也搜索了网络，但找不到解决方案。你能指导我吗？

PS。错误的更多细节：

System.AggregateException was unhandled
  HResult=-2146233088
  Message=One or more errors occurred.
  Source=mscorlib
  StackTrace:
       at System.Threading.Tasks.Task.ThrowIfExceptional(Boolean includeTaskCanceledExceptions)
       at System.Threading.Tasks.Task`1.GetResultCore(Boolean waitCompletionNotification)
       at System.Threading.Tasks.Task`1.get_Result()
       at bot_test1.Form1.runBot() in C:\Users\Person1\Documents\Visual Studio 2015\Projects\bot_test1\bot_test1\Form1.cs:line 47
       at System.Threading.ThreadHelper.ThreadStart_Context(Object state)
       at System.Threading.ExecutionContext.RunInternal(ExecutionContext executionContext, ContextCallback callback, Object state, Boolean preserveSyncCtx)
       at System.Threading.ExecutionContext.Run(ExecutionContext executionContext, ContextCallback callback, Object state, Boolean preserveSyncCtx)
       at System.Threading.ExecutionContext.Run(ExecutionContext executionContext, ContextCallback callback, Object state)
       at System.Threading.ThreadHelper.ThreadStart()
  InnerException: 
       HResult=-2146233088
       Message=An error occurred while sending the request.
       Source=mscorlib
       StackTrace:
            at System.Runtime.CompilerServices.TaskAwaiter.ThrowForNonSuccess(Task task)
            at System.Runtime.CompilerServices.TaskAwaiter.HandleNonSuccessAndDebuggerNotification(Task task)
            at Telegram.Bot.TelegramBotClient.<MakeRequestAsync>d__54`1.MoveNext()
       InnerException: 
            HResult=-2146233079
            Message=The request was aborted: Could not create SSL/TLS secure channel.
            Source=System
            StackTrace:
                 at System.Net.HttpWebRequest.EndGetRequestStream(IAsyncResult asyncResult, TransportContext& context)
                 at System.Net.Http.HttpClientHandler.GetRequestStreamCallback(IAsyncResult ar)
            InnerException: 

Answer 1

一段时间后，我找到了解决方案： 必须将这些代码添加到程序代码中才能工作：

using System.Net;

ServicePointManager.Expect100Continue = true;
ServicePointManager.SecurityProtocol = SecurityProtocolType.Tls12;

但我仍然不确定代码之前是否可以正常工作，但现在需要进行这些更改才能正常工作。