SilverLight3 Cool开发（一） BingAPI实现手写搜索框
前言
此实例由Csdn讲师栾轩开发，本人也只是初学SilverLight，出于学习目的将此自己的开发过程与大家分享，并提供源码，欢迎共同探讨进步。
第一步：创建一个SilverLightApplication
创建后会出现一个对话框，SilverLight版本可以选择2.0或3.0，这里选择3.0。Project Type选择默认（如果仅做一个插件就不需要Web支持）。确认，项目已经建成了。
第二步，UI设计
将Grid改为StackPanel，StackPanel用于水平或垂直排列控件,支持嵌套。
InkPresenter,这是手写输入的模块，注意这是的MouseMove等事件的方法名在VS2008中通过Tab调出，在这里输入=号后会出现提
示，这里选择New Events Handle，后台会自动生成此事件的方法。
ProgressBar 进度条 通过Visibility属性控制是否滚动显示
ScrollViewer 自适应容器，由于手写输入的识别相似结果会很多，这里用到可以自适应高度
ListBox 用来显示通过Bing Api查询出的结果
| 1 | <StackPanel x:Name="LayoutRoot" Orientation="Vertical"> |
| 2 | <InkPresenter x:Name="InkCanvas" Height="150" Background="LightBlue" |
| 3 | MouseMove="InkCanvas_MouseMove" |
| 4 | MouseLeftButtonDown="InkCanvas_MouseLeftButtonDown" |
| 5 | MouseLeftButtonUp="InkCanvas_MouseLeftButtonUp" |
| 6 | MouseLeave="InkCanvas_MouseLeave" |
| 7 | /> |
| 8 | <StackPanel Orientation="Horizontal"> |
| 9 | <ProgressBar x:Name="PROGRESS" |
| 10 | Visibility="Collapsed" |
| 11 | IsIndeterminate="True" |
| 12 | Width="40"/> |
| 13 | <Button x:Name="Clear" Content="清空" Click="Clear_Click"/> |
| 14 | <ScrollViewer HorizontalScrollBarVisibility="Auto" |
| 15 | VerticalScrollBarVisibility="Hidden"> |
| 16 | <StackPanel x:Name="Results" |
| 17 | Orientation="Horizontal" |
| 18 | Margin="30,0,0,0"/> |
| 19 | </ScrollViewer> |
| 20 | </StackPanel> |
| 21 | <ListBox x:Name="SearchResultPanel"></ListBox> |
| 22 | </StackPanel> |
预览效果如下
第三步，手写识别
1.手写识别是WCF才有的，我们只能通过WebService来处理这些结果，然后传给页面。新建一个WCF Service，用默认的命名就可以了
2.打开服务的CodeBehind
添加引用
using System.Windows.Ink;
using System.Windows.Input;
打到当前系统下的"IAWinFX.dll" "IACore.dll"(如图) ，C:\Program Files\Microsoft SDKs\Windows\v7.0A\bin下的IALoader.dll，C:\Program Files\Reference Assemblies\Microsoft\Framework\v3.0\WindowsBase.dll
C:\Program Files\Reference Assemblies\Microsoft\Framework\v3.0\PresentationCore.dll
总共是5个dll,在VS2008里只引用前三个就够了，没想到VS2010里面会这么多，在这里卡壳了，最终还是找到了这个PresentationCore.dll。
Code：将客户端传入的手写数据转换为字符串数组
将DoWork方法改为：
| 1 | public List<string> ConvertInkToString(List<List<List<double>>> Data) |
| 2 | { |
| 3 | try |
| 4 | { |
| 5 | // 还原Data |
| 6 | StrokeCollection sc = new StrokeCollection();//WCF识别的笔画集，silverlight识别的WCF识别的笔画集类型相同，但里面的架构信息不同 |
| 7 | foreach (var strokeData in Data) |
| 8 | { |
| 9 | StylusPointCollection SPCData = new StylusPointCollection();//添加点集 |
| 10 | foreach (var PointData in strokeData) |
| 11 | { |
| 12 | StylusPoint sPoint = new StylusPoint(PointData[0], PointData[1]);//添加点 |
| 13 | SPCData.Add(sPoint); |
| 14 | } |
| 15 | Stroke StrokeInstanse = new Stroke(SPCData);//添加笔画 |
| 16 | sc.Add(StrokeInstanse); |
| 17 | } |
| 18 | InkAnalyzer Core = new InkAnalyzer();//笔画分析的实例 |
| 19 | //Core.SetStrokeLanguageId(sc,0x0804);//设置中文 |
| 20 | Core.AddStrokes(sc); |
| 21 | var result = Core.Analyze(); |
| 22 | if (result.Successful) |
| 23 | { |
| 24 | List<string> Returning = new List<string>();//添加最相似字符串 |
| 25 | Returning.Add(Core.GetRecognizedString()); |
| 26 | foreach (var s in Core.GetAlternates()) //添加类似字符串 |
| 27 | { |
| 28 | Returning.Add(s.RecognizedString); |
| 29 | } |
| 30 | return Returning; |
| 31 | } |
| 32 | else |
| 33 | { |
| 34 | return new List<string> { "不能识别！" }; |
| 35 | } |
| 36 | } |
| 37 | catch |
| 38 | { |
| 39 | return new List<string> { "错误！" }; |
| 40 | } |
| 41 | } |
3.在xaml项目中右键选择 Add Service Reference,点击下图的Discovery
查看高级选项，确认Collection type选中的是
第四步：Bing搜索 api服务引用
1.申请api Id
进入www.bing.com/developer,选择Get An AppId,用自己的Msn申请一个。
2.添加服务引用
重复上面的引用操作，将Address改为http://api.search.live.net/search.wsdl?AppId=填写申请的Bing Id
第五步：完成Page.xaml.cs后台代码
| public Page() |
| { |
| InitializeComponent(); |
| c.ConvertInkToStringCompleted+=new EventHandler<SLSearch2010.ServiceReference1.ConvertInkToStringCompletedEventArgs>(c_ConvertInkToStringCompleted); |
| search.SearchCompleted += new EventHandler<SLSearch2010.ServiceReference2.SearchCompletedEventArgs>(search_SearchCompleted); |
| } |
| /// <summary> |
| /// 搜索完成后的绑定 |
| /// </summary> |
| /// <param name="sender"></param> |
| /// <param name="e"></param> |
| void search_SearchCompleted(object sender, SLSearch2010.ServiceReference2.SearchCompletedEventArgs e) |
| { |
| PROGRESS.Visibility = Visibility.Collapsed; |
| SearchResultPanel.Items.Clear(); |
| foreach (var i in e.Result.Web.Results) |
| { |
| ListBoxItem L = new ListBoxItem(); |
| StackPanel s = new StackPanel(); |
| //设置标题 |
| TextBlock Title = new TextBlock(); |
| Title.Text = i.Title; |
| Title.FontSize = 19; |
| Title.Foreground = new SolidColorBrush(Colors.Gray); |
| //添加内容 |
| TextBlock Content = new TextBlock(); |
| Content.FontSize = 15; |
| Content.Text = i.Description; |
| Content.Foreground = new SolidColorBrush(Colors.Black); |
| //添加地址超链接 |
| TextBlock uri = new TextBlock(); |
| uri.FontSize =13; |
| uri.Text = i.DisplayUrl; |
| //StackPanel中添加结果 |
| s.Orientation = Orientation.Vertical; |
| s.Children.Add(Title); |
| s.Children.Add(Content); |
| s.Children.Add(uri); |
| L.Content = s; |
| SearchResultPanel.Items.Add(L); |
| L.Tag = uri.Text; |
| L.MouseLeftButtonUp += new MouseButtonEventHandler(L_MouseLeftButtonUp);//点击前往搜索目标 |
| } |
| } |
| /// <summary> |
| /// 打开新的页面 |
| /// </summary> |
| /// <param name="sender"></param> |
| /// <param name="e"></param> |
| void L_MouseLeftButtonUp(object sender, MouseButtonEventArgs e) |
| { |
| System.Windows.Browser.HtmlPage.PopupWindow(new UriBuilder((sender as ListBoxItem).Tag.ToString()).Uri, "", new System.Windows.Browser.HtmlPopupWindowOptions()); |
| } |
| //手写输入停止时，输出识别结果 |
| void c_ConvertInkToStringCompleted(object sender, SLSearch2010.ServiceReference1.ConvertInkToStringCompletedEventArgs e) |
| { |
| PROGRESS.Visibility=Visibility.Collapsed; |
| Results.Children.Clear(); |
| foreach (string i in e.Result) |
| { |
| Button B=new Button(); |
| B.Content=i; |
| B.FontSize=18; |
| B.Click+=new RoutedEventHandler(B_Click); |
| B.Tag=i; |
| Results.Children.Add(B); |
| } |
| } |
| //点击识别后的结果，进入搜索 |
| void B_Click(object sender, RoutedEventArgs e) |
| { |
| SearchRequest S = new SearchRequest(); |
| S.AppId = "8350DD458AD2C27C0200A2D743DE34FC7A853599"; |
| S.Version = "2.0"; |
| S.Sources =new SourceType[]{SourceType.Web}; |
| S.Query=(sender as Button).Tag.ToString(); |
| S.Web = new SLSearch2010.ServiceReference2.WebRequest() |
| { |
| CountSpecified=true, |
| Count=50 |
| }; |
| PROGRESS.Visibility=Visibility.Visible; |
| search.SearchAsync(S); |
| } |
| ServiceReference1.Service1Client c = new SLSearch2010.ServiceReference1.Service1Client(); //手写识别服务 |
| ServiceReference2.LiveSearchPortTypeClient search = new SLSearch2010.ServiceReference2.LiveSearchPortTypeClient(); //Bing搜索服务 |
| bool Tracking = false; |
| Stroke Current;//当前一笔 |
| private void InkCanvas_MouseMove(object sender, MouseEventArgs e) |
| { |
| if (Tracking) |
| { |
| Current.StylusPoints.Add(e.StylusDevice.GetStylusPoints(InkCanvas)); |
| } |
| } |
| /// <summary> |
| /// 按下鼠标 |
| /// </summary> |
| /// <param name="sender"></param> |
| /// <param name="e"></param> |
| private void InkCanvas_MouseLeftButtonDown(object sender, MouseButtonEventArgs e) |
| { |
| Tracking = true; |
| Current=new Stroke(); |
| InkCanvas.Strokes.Add(Current); |
| //Point > GetPosition(...); |
| Current.StylusPoints.Add(e.StylusDevice.GetStylusPoints(InkCanvas)); |
| } |
| /// <summary> |
| /// 松开鼠标左键 |
| /// </summary> |
| /// <param name="sender"></param> |
| /// <param name="e"></param> |
| private void InkCanvas_MouseLeftButtonUp(object sender, MouseButtonEventArgs e) |
| { |
| try |
| { |
| Current.StylusPoints.Add(e.StylusDevice.GetStylusPoints(InkCanvas)); |
| Tracking = false; |
| Current = null; |
| PROGRESS.Visibility = Visibility.Visible; |
| c.ConvertInkToStringAsync(ConvertData(InkCanvas)); |
| } |
| catch |
| { } |
| } |
| //清空手写板 |
| private void Clear_Click(object sender, RoutedEventArgs e) |
| { |
| InkCanvas.Strokes.Clear(); |
| } |
| //离开InkCavas |
| private void InkCanvas_MouseLeave(object sender, MouseEventArgs e) |
| { |
| //Current.StylusPoints.Add(e.StylusDevice.GetStylusPoints(InkCanvas)); |
| if (Tracking) |
| { |
| Tracking = false; |
| Current = null; |
| PROGRESS.Visibility = Visibility.Visible; |
| } |
| } |
| /// <summary> |
| /// 将笔画信息去掉结构中的多余信息 |
| /// </summary> |
| /// <param name="Target"></param> |
| /// <returns></returns> |
| private ObservableCollection<ObservableCollection<ObservableCollection<double>>> ConvertData(InkPresenter Target) |
| { |
| ObservableCollection<ObservableCollection<ObservableCollection<double>>> Data = new ObservableCollection<ObservableCollection<ObservableCollection<double>>>(); |
| foreach (Stroke S in Target.Strokes) |
| { |
| ObservableCollection<ObservableCollection<double>> CurrentStroke = new ObservableCollection<ObservableCollection<double>>(); |
| foreach (StylusPoint P in S.StylusPoints) |
| { |
| CurrentStroke.Add(new ObservableCollection<double>() { P.X, P.Y }); |
| } |
| Data.Add(CurrentStroke); |
| } |
| return Data; |
| } |
结果：运行与调试成功，没有任何问题，但最终还是看不到结果，注释会在找到原因后尽快添加，应该是环境配置问题。。。现在只能提供在VS2008下完成并且成功的源码，大哥前辈们，谁能救救我！！
错误: Sys.InvalidOperationException: InitializeError error #2106 in control 'XamlError': 无法加载此应用程序。它是使用过时的 Silverlight 版本生成的
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