C＃Backgroundworker没有明显原因打破循环

Question

在我进入代码之前，让我解释一下我正在尝试做什么。这是一个针对API的简单清单，api有一个限制，我想方设法通过我的路由器轻松更改我的IP来打破限制。它在大多数情况下都很好用，但在重新连接成功之后的某个时刻，工作人员停止了，我必须再次点击该按钮。

这是代码，首先是Form类：

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

namespace MyNameChecker
{
    public partial class Form1 : Form
    {
        public Form1()
        {
            InitializeComponent();
        }

        private void chk_Click(object sender, EventArgs e)
        {
            if (!checkNames.IsBusy)
            {
                checkNames.RunWorkerAsync();
            }
        }

        int last = 0;

        private void checkNames_DoWork(object sender, DoWorkEventArgs e)
        {
            string namesList = "";

            string[] namesArray;

            if (names.InvokeRequired) names.Invoke(new MethodInvoker(delegate { namesList = names.Text; }));            
            else namesList = names.Text;

            if (!string.IsNullOrEmpty(namesList))
            {
                namesArray = namesList.Replace("\r","").Split('\n');
                while (last < namesArray.Length)
                {
                    string tempStr = NameChecker.check(namesArray[last].Replace("\r", "").Replace("\n", ""));
                    if (tempStr == "available")
                    {
                        using (System.IO.StreamWriter file = new System.IO.StreamWriter(@"C:\Names\available.txt", true)) file.WriteLine(namesArray[last]);
                        last++;
                    }
                    else if (tempStr == "unavailable" || tempStr == "skep")
                    {
                        last++;
                    }
                    else
                    {
                        while(!NameChecker.reconnect()); 
                    }
                }
                if (last >= namesArray.Length)  last = 0;
            }
        }
    }
}

第二个MyNameChecker类：​​

using System;
using System.Collections.Generic;
using System.IO;
using System.Linq;
using System.Net;
using System.Text;
using System.Windows.Forms;

namespace MyNameChecker
{
    class NameChecker
    {
        public static string check(string name)
        {
            if (string.IsNullOrEmpty(name)) return "skep";
            string url = "https://example.com/api";
            HttpWebRequest webRequest = (HttpWebRequest)WebRequest.Create(url);
            webRequest.AllowAutoRedirect = false;
            webRequest.Method = "POST";
            webRequest.KeepAlive = true;
            webRequest.ContentType = "application/json; charset=UTF-8";
            ASCIIEncoding encoding = new ASCIIEncoding();
            string stringData = "{\"name\":\"" + name + "\"}";
            byte[] data = encoding.GetBytes(stringData);
            webRequest.ContentLength = data.Length;
            webRequest.GetRequestStream().Write(data, 0, data.Length);
            webRequest.Timeout = 60000;

            try
            {
                // Get the response ...
                using (HttpWebResponse webResponse = (HttpWebResponse)webRequest.GetResponse())
                {
                    if (string.IsNullOrEmpty(webResponse.Headers["RequestNum"])) return "retry";
                    else return status(webResponse);
                }
            }
            catch (WebException ex)
            {
                var res = (HttpWebResponse)ex.Response;
                if (string.IsNullOrEmpty(res.Headers["RequestNum"])) return "retry";
                else return status(res);
            }
            catch (Exception ex)
            {
                using (System.IO.StreamWriter file = new System.IO.StreamWriter(@"C:\Names\Exceptions.txt", true)) file.WriteLine(ex.Message);
                return "retry";
            }
            return "retry";
        }

        private static string status(HttpWebResponse res)
        {
            switch((int)res.StatusCode)
            {
                case 201:
                    return "available";
                case 400:
                    return "unavailable";
                default:
                    return "retry";
            }
        }


        public static bool reconnect()
        {
            string url = "http://router.lan/cgi/b/is/_pppoe_/ov/?be=0&l0=1&l1=1&name=Internet";
            HttpWebRequest webRequest = (HttpWebRequest)WebRequest.Create(url);
            webRequest.AllowAutoRedirect = false;
            webRequest.Method = "POST";
            webRequest.ContentType = "application/x-www-form-urlencoded";
            webRequest.KeepAlive = true;
            System.Net.ServicePointManager.Expect100Continue = false;
            ASCIIEncoding encoding = new ASCIIEncoding();
            string stringData = "0=12&1=Internet&32=1";
            byte[] data = encoding.GetBytes(stringData);
            webRequest.ContentLength = data.Length;
            webRequest.GetRequestStream().Write(data, 0, data.Length);
            webRequest.Timeout = 25000;

            try
            {
                // Get the response ...
                using (HttpWebResponse webResponse = (HttpWebResponse)webRequest.GetResponse())
                {
                    // Get the body stream
                    string body = new System.IO.StreamReader(webResponse.GetResponseStream()).ReadToEnd();
                    if (body.Contains("Uptime:")) return true;

                    return false;
                }
                return false;
            }
            catch (WebException ex)
            {
                var res = (HttpWebResponse)ex.Response;
                string body = new System.IO.StreamReader(res.GetResponseStream()).ReadToEnd();
                if (body.Contains("Uptime:")) return true;

                return false;
            }
            catch (Exception ex)
            {
                using (System.IO.StreamWriter file = new System.IO.StreamWriter(@"C:\Names\Exceptions.txt", true)) file.WriteLine(ex.Message);
                return false;
            }
            return false;
        }
    }
}

我尝试了所有可以通过增加超时来捕获所有异常但是没有记录异常？我无法解决这个问题。通常我会去睡觉，让它做它的工作，但这只是没有按预期工作。

BTW我用fiddler调试请求，并且有一个奇怪的标题Expect: 100-continue我不知道这是否与破坏有关但我认为最好提一下。