/// <summary>
        /// 开始下载提取
        /// </summary>
        /// <param name="item"></param>
        private void _begin(UrlItem item)
        {
            var request = new Request();
            var html    = request.Get(item.Url);

            #region 控制深度
            if (item.Depth < Depth || Depth <= 0)
            {
                var htmlHelper = new Html(html);
                var links      = htmlHelper.GetLinks(item.Url);
                foreach (var newItem in from link in links let newItem = new UrlItem(link, item.Depth + 1, UrlStatus.Waiting) where !UrlsList.Contains <UrlItem>(newItem, new UrlItemComparer()) && (Kind != 1 || htmlHelper.Comparer(item.Url, link)) select newItem)
                {
                    lock (_object)
                    {
                        Application.Current.Dispatcher.Invoke(() =>
                        {
                            UrlsList.Add(newItem);
                        });
                    }
                }
            }
            if (!string.IsNullOrEmpty(_pattern) && Regex.IsMatch(html, _pattern))
            {
                return;
            }
            var helper = new NumberHelper();
            var lists  = helper.GetNumberWithHtml(html);
            #endregion
            lock (_object)
            {
                _numberList.AddRange(lists);
                _numberList = _numberList.Distinct().ToList();
                Application.Current.Dispatcher.Invoke(() =>
                {
                    Message = $"目前已提取{_numberList.Count}个号码!";
                });
            }
        }
        private void ExecuteStartCommand()
        {
            if (UrlsList.Count == 0)
            {
                UrlsList.Add(new UrlItem(UrlHelper.GetUrl(BaseUrl)));
            }
            Message  = "自动爬虫启动!";
            IsEnable = false;
            _init();
            if (!string.IsNullOrWhiteSpace(Keywords))
            {
                _pattern = Keywords.Replace(" ", "|");
            }
            #region 创造主线程,去分配多个下载线程
            _tokenSource = new CancellationTokenSource();
            var token = _tokenSource.Token;
            Task.Factory.StartNew(() =>
            {
                var index = 0;
                while (!token.IsCancellationRequested)
                {
                    #region 创建执行下载的线程数组
                    var tasksLength = Math.Min(Count, UrlsList.Count - index);
                    var tasks       = new Task[tasksLength];
                    for (var i = 0; i < tasksLength; i++)
                    {
                        var index1 = index;
                        tasks[i]   = new Task(() =>
                        {
                            _begin(UrlsList[index1]);
                        });
                        index++;
                    }
                    #endregion

                    #region 监视线程数组完成
                    var continuation = Task.Factory.ContinueWhenAll(tasks, (task) =>
                                                                    { }, token);
                    foreach (var task in tasks)
                    {
                        task.Start();
                    }
                    while (!continuation.IsCompleted)
                    {
                        Thread.Sleep(1000);
                    }
                    #endregion
                    _changedStatus(index - tasksLength, tasksLength, UrlStatus.Completed);
                    if (index >= UrlsList.Count)
                    {
                        _tokenSource.Cancel();
                        break;
                    }
                }
                Application.Current.Dispatcher.Invoke(() =>
                {
                    IsEnable = true;
                });
            }, token);
            #endregion
            #region 计时器 做自动导出操作
            var token1 = _tokenSource.Token;
            Task.Factory.StartNew(() =>
            {
                var time = Space;
                while (!token1.IsCancellationRequested)
                {
                    Thread.Sleep(10000);
                    time--;
                    if (time > 0 && !token1.IsCancellationRequested)
                    {
                        continue;
                    }
                    var file = ExportHelper.ExportRandomName(_numberList, "爬虫导出-");
                    lock (_object)
                    {
                        _numberList.Clear();
                        Message = "执行自动保存操作,保存到:" + file;
                    }
                    time = Space;
                }
            }, token1);
            #endregion
        }