vs2010 学习Silverlight学习笔记(20):LiveSearch

概要：

       这个例子是应用在API的一个实用的例子。也算是对一些API使用的例子吧。

内容：

1，  引入要使用的ServiceAPI。（SL，web都要有）

2，  添加一个webService，用来解析返回的数据

using System;

usingSystem.Collections.Generic;

usingSystem.Linq;

usingSystem.Web;

usingSystem.Web.Services;

usingSystem.ComponentModel;

using System.Data;

usingSystem.Web.Services.Protocols;

usingSystem.Xml.Linq;

usingSLDemo25LiveSearch.Web.LiveSearchService;

namespaceSLDemo25LiveSearch.Web

{

    /// <summary>

    /// Summary description forLiveSearchWebService

    /// </summary>

    [WebService(Namespace ="http://tempuri.org/")]

    [WebServiceBinding(ConformsTo =WsiProfiles.BasicProfile1_1)]

    [System.ComponentModel.ToolboxItem(false)]

    // To allow this Web Service to be calledfrom script, using ASP.NET AJAX, uncomment the following line.

    //[System.Web.Script.Services.ScriptService]

    public class LiveSearchWebService :System.Web.Services.WebService

    {

        [WebMethod]

        public SearchResultItem[]DoSearch(string query)

        {

            MSNSearchPortTypeClient s = newMSNSearchPortTypeClient();

            SearchRequest searchRequest = newSearchRequest();

            int arraySize = 1;

            SourceRequest[] sr = newSourceRequest[arraySize];

            sr[0] = new SourceRequest();

            sr[0].Source = SourceType.Web;

            searchRequest.Query = query;

            searchRequest.Requests = sr;

            searchRequest.AppID ="C0680205851CCC0E38946DB8FF74156C1C826A86";

            searchRequest.CultureInfo ="zh-CN";

            SearchResponse searchResponse;

            searchResponse =s.Search(searchRequest);

            List<SearchResultItem> lists= new List<SearchResultItem>();

            foreach (SourceResponsesourceResponse in searchResponse.Responses)

            {

                Result[] sourceResults =sourceResponse.Results;

                foreach (Result sourceResult insourceResults)

                {

                    SearchResultItem item = newSearchResultItem();

                    if ((sourceResult.Title !=null) && (sourceResult.Title != String.Empty))

                        item.Title =sourceResult.Title;

                    if((sourceResult.Description != null) && (sourceResult.Description !=String.Empty))

                        item.Description =sourceResult.Description;

                    if ((sourceResult.Url !=null) && (sourceResult.Url != String.Empty))

                        item.Url =sourceResult.Url;

                    lists.Add(item);

                }

            }

            return lists.ToArray();

        }

    }

}

3，  为了显示方便，实例化一个类包含要使用的数据声明

public class SearchResultItem

{

    public string Title { get; set; }

    public string Url { get; set; }

    public string Description { get; set; }

}

4，xaml的布局

<Grid x:Name="LayoutRoot" Background="White">

    <Grid.RowDefinitions>

        <RowDefinition Height="55"></RowDefinition>

        <RowDefinition Height="50"></RowDefinition>

        <RowDefinition Height="35"></RowDefinition>

    </Grid.RowDefinitions>

    <Grid.ColumnDefinitions>

        <ColumnDefinition Width="*"></ColumnDefinition>

    </Grid.ColumnDefinitions>

    <Image Source="LiveSearch.png" Grid.Column="0"></Image>

    <StackPanel Grid.Row="1" Orientation="Horizontal">

        <TextBox x:Name="txtQuery" Width="400" Height="35"

                 Margin="50 0 0 0" BorderBrush="#3F7801"></TextBox>

        <Button x:Name="btnSearch" Width="120" Height="35"

                Background="#62A21D" Margin="20 0 0 0"

                Content="Search" FontSize="16" Click="btnSearch_Click"></Button>

    </StackPanel>

    <TextBlock Grid.Row="2" Text="网页搜索结果" Foreground="#59990E"

               FontSize="16" Margin="20 0 0 0"></TextBlock>

</Grid>

5，MainPage.Xaml.cs

using System;

using System.Collections.Generic;

using System.Linq;

using System.Net;

using System.Windows;

using System.Windows.Controls;

using System.Windows.Documents;

using System.Windows.Input;

using System.Windows.Media;

using System.Windows.Media.Animation;

using System.Windows.Shapes;

using System.Windows.Browser;

using SLDemo25LiveSearch.LiveSearchService;

namespace SLDemo25LiveSearch

{

    public partial class MainPage : UserControl

    {

        public MainPage()

        {

            InitializeComponent();

        }

        private void btnSearch_Click(object sender, RoutedEventArgs e)

        {

            LiveSearchWebServiceSoapClient client = new LiveSearchWebServiceSoapClient();

            client.DoSearchCompleted += new EventHandler<DoSearchCompletedEventArgs>(client_DoSearchCompleted);

            client.DoSearchAsync(this.txtQuery.Text);

        }

        void client_DoSearchCompleted(object sender, DoSearchCompletedEventArgs e)

        {

            if (e.Error == null)

            {

                SearchResultItem[] results = e.Result as SearchResultItem[];

                HtmlElement result = HtmlPage.Document.GetElementById("result");

                foreach (SearchResultItem item in results)

                {

                    HtmlElement itemElement = HtmlPage.Document.CreateElement("div");

                    itemElement.CssClass = "itemstyle";

                    HtmlElement titleElement = HtmlPage.Document.CreateElement("a");

                    titleElement.SetAttribute("href", item.Url);

                    titleElement.SetAttribute("innerText", item.Title);

                    HtmlElement descriptElement = HtmlPage.Document.CreateElement("div");

                    descriptElement.SetAttribute("innerText", item.Description);

                    HtmlElement urlElement = HtmlPage.Document.CreateElement("span");

                    urlElement.SetAttribute("innerText", item.Url);

                    urlElement.CssClass = "urlstyle";

                    itemElement.AppendChild(titleElement);

                    itemElement.AppendChild(descriptElement);

                    itemElement.AppendChild(urlElement);

                    result.AppendChild(itemElement);

                }

            }

        }

    }

}

总结：

   这是一个很实用的例子，因为在没有联网的情况下，LiveService无法添加。在有网的时候要从新写一遍。