LazyListBoxHelper 动态分页

最近整理电脑东西,虽然WP7已成过去式,记录下吧，代码是该别人的,增加委托传值,如得到获取数据的百分比等

正则抓取下厨房数据

下厨房正则
<span\s+itemprop="amount"> (?<title>.+?)</span>

<img\b[^<>]*?\bsrc[\s\t\r\n]*=[\s\t\r\n]*[""']?[\s\t\r\n]*(?<imgUrl>[^\s\t\r\n""'<>]*)[^<>]*?/?[\s\t\r\n]*> 图片

<div\s+class="g-recipe-intro"\s+itemprop="summary">(?<title>.+?)</div>   介绍

<em\s+itemprop="name">(?<title>.+?)</em>                 配料
 
<div\s+class="g-recipe-steps"\s+itemprop="instructions">.+?<ol>.+?<li>(?<title>.+?)<br\s+class="clr"/>   第一步 

<li>(?<title>.+?)<br\s+class="clr"/>.+?</li>                做法
<pre\s+class="g-recipe-tips\s+g-f14">(?<title>.+?)</pre>         小贴士

豆果

<span><a\s+href="/store/lists/c1t(?<url>.+?)">(?<title>.+?)</a></span>  菜系类型
<a\s+href="(?<Href>.+?)"\s+target="_blank"><img.+?src="(?<ImgUrl>.+?)"\s+alt="(?<Name>.+?)"></a>.+?<p>(?<Place>.+?)</p> 菜系详细
<h2>特色菜：</h2>.+?([<span>.+?</span>].+?)</div>   特色菜
<dt>电话：</dt>.+?<dd>(?<Phone>.+?)</dd>


做法
<em>(?<num>.+?)</em>.+?<span>(?<title>.+?)</span>.+? <img\s+src="(?<src>.+?)"
<em>(?<num>.+?)</em>(?<title>.+?)<br\s+class="clr"/>         No Image
主料
itemprop="name"\s+title=.+?的做法">(?<title>.+?)<span\s+class="buy-price">
<a\s+href=.+?的做法"\s+itemprop="name">(?<title>.+?)</a>

分页

 public delegate void LazyListBoxHelperDelegateHandler(object obj);
    public class LazyListBoxHelper
    {
        static public int _pageIndex=0;
        static public bool _isBusy=true;
        //用于保存ListBox的ScrollViewer对象的引用
        static private ScrollViewer _scrollViewer = null;
        //用于判断是否已经捕捉ScrollViewer
        static private bool _isHookedScrollEvents = false;
        static public event LazyListBoxHelperDelegateHandler EventLazyListBoxHelperDelegateHandler;
        public static void InitLazyBox(Control LazyBox)
        {
            List<ScrollBar> scrollBarList = GetVisualChildCollection<ScrollBar>(LazyBox);
            foreach (ScrollBar scrollBar in scrollBarList)
            {
                if (scrollBar.Orientation == System.Windows.Controls.Orientation.Horizontal)
                {

                }
                else
                {
                    scrollBar.ValueChanged += verticalScrollBar_ValueChanged;
                }
            }
        }
        #region  分页调用方法

        /// <summary>  
        /// 分页  
        /// </summary>  
        /// <param name="sender"></param>  
        /// <param name="e"></param>  
        private static void verticalScrollBar_ValueChanged(object sender, RoutedEventArgs e)
        {
            ScrollBar scrollBar = (ScrollBar)sender;
            object valueObj = scrollBar.GetValue(ScrollBar.ValueProperty);
            object maxObj = scrollBar.GetValue(ScrollBar.MaximumProperty);
            if (valueObj != null && maxObj != null)
            {
                double value = (double)valueObj;
                double max = (double)maxObj - 1.0;
                if (value >= max)
                {
                    if (EventLazyListBoxHelperDelegateHandler != null)
                    {
                        EventLazyListBoxHelperDelegateHandler(max);
                    }
                }
            }
        }


        public static List<T> GetVisualChildCollection<T>(object parent) where T : UIElement
        {
            List<T> visualCollection = new List<T>();
            GetVisualChildCollection(parent as DependencyObject, visualCollection);
            return visualCollection;
        }


        public static void GetVisualChildCollection<T>(DependencyObject parent, List<T> visualCollection) where T : UIElement
        {
            int count = VisualTreeHelper.GetChildrenCount(parent);
            for (int i = 0; i < count; i++)
            {
                DependencyObject child = VisualTreeHelper.GetChild(parent, i);
                if (child is T)
                {
                    visualCollection.Add(child as T);
                }
                else if (child != null)
                {
                    GetVisualChildCollection(child, visualCollection);
                }
            }
        }
        #endregion

        /// <summary>  
        ///获取控件的子控件  
        /// </summary>  
        /// <typeparam name="T">子控件类</typeparam>  
        /// <param name="root">父控件</param>  
        /// <returns></returns>  
        public static T FindChildOfType<T>(DependencyObject root) where T : class
        {
            var queue = new Queue<DependencyObject>();
            queue.Enqueue(root);

            while (queue.Count > 0)
            {
                DependencyObject current = queue.Dequeue();
                for (int i = VisualTreeHelper.GetChildrenCount(current) - 1; 0 <= i; i--)
                {
                    var child = VisualTreeHelper.GetChild(current, i);
                    var typedChild = child as T;
                    if (typedChild != null)
                    {
                        return typedChild;
                    }
                    queue.Enqueue(child);
                }
            }
            return null;
        }

        /// <summary>  
        /// 高敏感翻页  
        /// </summary>  
        public static bool HightDragSensitivity
        {
            get
            {
                return false;
            }
        }
    }

调用如果需要返回当前状态值,订阅Event事件即可

LazyListBoxHelper.EventLazyListBoxHelperDelegateHandler += (args) =>
            {
                WebClient client = new WebClient();
                if (!client.IsBusy && LazyListBoxHelper._isBusy)
                {
                    LazyListBoxHelper._isBusy = false;
                    LazyListBoxHelper._pageIndex += 20;
                    this.progressBar.IsIndeterminate = true;
                    this.progressBar.Visibility = Visibility.Visible;
                    client.DownloadStringCompleted += (s, e) =>
                    {
                        if (e.Error == null)
                        {
                            List<FindLinkInfo> list = GetFoodDetail(e.Result);
                            for (int i = 0; i < list.Count; i++)
                            {
                                this.ListFindData.Items.Add(list[i]);
                            }
                            LazyListBoxHelper._isBusy = true;
                        }
                        this.progressBar.IsIndeterminate = false;
                        this.progressBar.Visibility = Visibility.Collapsed;
                    };
                    client.DownloadStringAsync(new Uri(String.Format(@"http://www.douguo.com/store/lists/c1t/{0}{1}", (this.listFindTitle.SelectedItem as FindLinkInfo).Url, LazyListBoxHelper._pageIndex), UriKind.Absolute));
                }
            };
            LazyListBoxHelper.InitLazyBox(ListFindData);
        }
        private void IninHot()
        {
            //检查网路
            if (NetworkInterface.GetIsNetworkAvailable())
            {