WindowsPhone7开发简单豆瓣网应用程序之主页面功能实现

WindowsPhone7开发简单豆瓣网应用程序之主页面功能实现

   在上一篇博文当中介绍了豆瓣应用程序的界面设计，那么这些界面是如何实现功能呢？下面我讲代码分享给大家。

    主页面图：

 

大家可以看到主界面我们需要实现三种功能的搜索（搜书，搜乐，搜影）。由于这三种搜索的后台实现代码雷同，这里我以搜书为例。

1） 首先我们需要实例化WebClient对象，这里由于三种类型的搜索调用WebClient对象方法基本上一致，所有我把这些封装到一个通用类当中（MyWebClient.cs）。MyWebClient.cs中代码如下：

WebClient client = new WebClient();


                 public delegate bool MyWebClientDe( string xmlFile);

                MyWebClientDe _myDelegete;
                 /// <summary>
                 /// 回调函数设置获得返回的字符串
                 /// </summary>
                 ///
                 public bool IsBusy()
                {
                         return client.IsBusy;
                }
                 public MyWebClientDe myDelegete
                {
                        get { return _myDelegete; }
                        set { _myDelegete = value; }
                }

                 public MyWebClient()
                {
                        client.Encoding = Encoding.UTF8;

                        client.DownloadStringCompleted += new DownloadStringCompletedEventHandler(client_DownloadStringCompleted);

                }

                 void client_DownloadStringCompleted( object sender, DownloadStringCompletedEventArgs e)
                {
                         if (myDelegete != null)
                        {
                                 if (e.Error == null)
                                {
                                        myDelegete(e.Result);
                                }
                                 else
                                {
                                        MessageBox.Show(e.Error.Message.ToString());
                                }
                        }
                         else
                                MessageBox.Show( "未指定代理函数！");

                }

                 public bool DownloadStringAsync( string Api)
                {
                    
                         try
                        {
                                 if (!client.IsBusy)
                                {
                                        client.DownloadStringAsync( new Uri(Api));

                                         return true;
                                }
                                 else
                                {
                                         return false;
                                }
                        }
                         catch
                        {
                                 return false;
                        }


                }

2） 随后我们需要在MainPage.xaml.cs中添加如下代码：

 

绑定书籍信息

 

    鼠标点击事件

 

根据选择某一项进行跳转并传递id值。

3） 在MainPage.xaml.cs中还需要调用：DoubanDAL.cs；DouBanBook.cs及Navigation.cs。

 

4） 在DoubanDAL.cs中我们封装了搜索书籍，音乐，视频的通用属性信息搜索方法。代码如下：

MyWebClient myclinet = new MyWebClient();

                 public List<DouBanBook> GetBook( string xmlFile)
                {
                         try
                        {
                                 string ns1 = "{http://www.w3.org/2005/Atom}";
                                var xml1 = XDocument.Parse(xmlFile);
                                var slist = from one in xml1.Descendants(ns1 + "entry")
                                                        select new DouBanBook()
                                                        {
                                                                Titile = one.Element(ns1 + "title").Value,
                                                                Images = (from cone in one.Elements(ns1 + "link")
                                                                                    where cone.Attribute("rel").Value == "p_w_picpath"
                                                                                    select cone.Attribute("href").Value).First<string>(),
                                                                Id = one.Element(ns1 + "id").Value
                                                        };

                                return slist.ToList<DouBanBook>();

                        }
                        catch
                        {
                                return null;
                        }
                }

                public List<DouBanMusic> GetMusic(string xmlFile)
                {
                        try
                        {
解析查询出来的xml文件#region 解析查询出来的xml文件
                                string ns1 = "{http://www.w3.org/2005/Atom}";
                                var xml1 = XDocument.Parse(xmlFile);
                                //MessageBox.Show(xml1.ToString());

                        
                                                    


                                var slist = from one in xml1.Descendants(ns1 + "entry")
                                                        select new DouBanMusic()
                                                        {
                                                                Titile = one.Element(ns1 + "title").Value,
                                                                Images = (from cone in one.Elements(ns1 + "link")
                                                                                    where cone.Attribute("rel").Value == "p_w_picpath"
                                                                                    select cone.Attribute("href").Value).First<string>(),
                                                                Id = one.Element(ns1 + "id").Value
                                                        };
                                #endregion
                                return slist.ToList<DouBanMusic>();
                        }
                        catch
                        {
                                return null;
                        }
                }

                public List<DouBanVideo> GetVideo(string xmlFile)
                {
                        try
                        {
解析查询出来的xml文件#region 解析查询出来的xml文件
                                string ns1 = "{http://www.w3.org/2005/Atom}";
                                var xml1 = XDocument.Parse(xmlFile);
                                var slist = from one in xml1.Descendants(ns1 + "entry")
                                                        select new DouBanVideo()
                                                        {
                                                                Titile = one.Element(ns1 + "title").Value,
                                                                Images = (from cone in one.Elements(ns1 + "link")
                                                                                    where cone.Attribute("rel").Value == "p_w_picpath"
                                                                                    select cone.Attribute("href").Value).First<string>(),
                                                                Id = one.Element(ns1 + "id").Value
                                                        };
                                #endregion
                             return    slist.ToList<DouBanVideo>();
                        }

                        catch
                        {
                                return null;
                        }
                }

5） 在DouBanBook.cs中封装了我们需要查询的一些书籍信息的属性。代码如下：

//图片路径
                 public string Images { get; set; }
                 //标题
                 public string Titile { get; set; }
                 //ID
                 public string Id { get; set; }
                 //作者
                 public string author { get; set; }
                 //简介
                 public string suammary { get; set; }
                 //价格
                 public string price { get; set; }
                 //出版人
                 public string publisher { get; set; }

                 public string authorInfo { get; set; }

6） 在Navigation.cs中我们利用枚举实现页面跳转。代码如下：

public enum ApplicationPages
        {
                Book,
                Music,
                Video
        }
         public static class Navigation
        {
                 public static void GoToPage( this PhoneApplicationPage phoneApplicationPage, ApplicationPages applicationPage, string Id)
                {
                         switch (applicationPage)
                        {
                                 case ApplicationPages.Book:
                                        phoneApplicationPage.NavigationService.Navigate( new Uri( "/Views/BookPage.xaml?id="+Id ,UriKind.Relative));
                                         break;
                                 case ApplicationPages.Music:
                                        phoneApplicationPage.NavigationService.Navigate( new Uri( "/Views/MusicPage.xaml?id=" + Id, UriKind.Relative));
                                         break;
                                 case ApplicationPages.Video:
                                        phoneApplicationPage.NavigationService.Navigate( new Uri( "/Views/VideoPage.xaml?id=" + Id, UriKind.Relative));
                                         break;                            

                        }
                }
        }

这样我们就实现了主页面的搜索及跳转功能。

转载于:https://blog.51cto.com/wzk89/582045