silverlight 3 数据绑定及分页

前台页面

<StackPanel Orientation="Vertical">        
            <data:DataGrid x:Name="dataGrid"  HorizontalAlignment="Stretch" VerticalAlignment="Top" Margin="4"   AutoGenerateColumns="False" HeadersVisibility="Column" GridLinesVisibility="Horizontal" RowBackground="Cornsilk" AlternatingRowBackground="LemonChiffon" RowHeight="30" IsReadOnly="True" CanUserResizeColumns="False">
                <data:DataGrid.Columns>
                    <data:DataGridTextColumn Header="标题"  Binding="{Binding Title}"  Width="350" ></data:DataGridTextColumn>
                    <data:DataGridTextColumn Header="作者" Binding="{Binding Author}" Width="150" ></data:DataGridTextColumn>   
                </data:DataGrid.Columns>
            </data:DataGrid>
        <data:DataPager x:Name="datapager1" Height="24" Margin="8,0,8,40" VerticalAlignment="Bottom" Background="#FFD7E2EE" FontSize="13.333" Width="304" PageIndexChanged="datapager1_PageIndexChanged"/>

    </StackPanel>

后台页面代码:

 int PageSize = 10;//设定分页大小
        List<int> itemCount = new List<int>();//用于DataPager的数据提供
        public DataBaseOperate()
        {
            InitializeComponent();
        }

        private void UserControl_Loaded(object sender, RoutedEventArgs e)
        {
            BlogServiceSoapClient webClient = new BlogServiceSoapClient();            
            webClient.GetsimpleListAsync("",PageSize, 1);
            webClient.GetsimpleListCompleted+=new EventHandler<GetsimpleListCompletedEventArgs>(webClient_GetsimpleListCompleted);
            GeneralDataPagerContent();//生成DataPager的数据提供
        }
        void webClient_GetsimpleListCompleted(object sender, GetsimpleListCompletedEventArgs e)
        {
            if (e.Error == null)
            {
                dataGrid.ItemsSource = e.Result;
            }
        }
        void GeneralDataPagerContent()
        {
            BlogServiceSoapClient webClient = new BlogServiceSoapClient();
            webClient.GetTotalPagersAsync("",PageSize);
            webClient.GetTotalPagersCompleted +=
            new EventHandler<GetTotalPagersCompletedEventArgs>(webClient_GetTotalPagersCompleted);
        }
        void webClient_GetTotalPagersCompleted(object sender, GetTotalPagersCompletedEventArgs e)
        {
            int totalpagers = e.Result;
            for (int i = 1; i <= totalpagers; i++) itemCount.Add(i);
            PagedCollectionView pcv = new PagedCollectionView(itemCount);
            pcv.PageSize = 1;
            datapager1.Source = pcv;

        }

        


        void client_GetsimpleListCompleted(object sender, TerryLee.SilverlightDemo2.DataBaseOperateServiceReference.GetsimpleListCompletedEventArgs e)
        {
            if (e.Error == null)
            {
                dataGrid.ItemsSource = e.Result;
            }
        }

        private void datapager1_PageIndexChanged(object sender, EventArgs e)
        {
            BlogServiceSoapClient webClient = new BlogServiceSoapClient();
            webClient.GetsimpleListAsync("",PageSize, datapager1.PageIndex + 1);//索引值从0开始，所以要加1
            webClient.GetsimpleListCompleted += new EventHandler<GetsimpleListCompletedEventArgs>(webClient_GetsimpleListCompleted);

            //Binding(datapager1.PageIndex+2);
        }

        private void datapager1_PageIndexChanging(object sender, System.ComponentModel.CancelEventArgs e)
        {
            BlogServiceSoapClient webClient = new BlogServiceSoapClient();
            webClient.GetsimpleListAsync("", PageSize, datapager1.PageIndex + 1);//索引值从0开始，所以要加1
            webClient.GetsimpleListCompleted += new EventHandler<GetsimpleListCompletedEventArgs>(webClient_GetsimpleListCompleted);

        }

WebService里面有两个方法

 [WebMethod]
        public List<m_article> GetsimpleList(string strWhere, int PageSize, int CurrentPage)
        {
            StringBuilder strSql = new StringBuilder();
            strSql.Append("select  ");
            if (PageSize != 0)
                strSql.Append(" top " + PageSize);
            strSql.Append("  * ");
            strSql.Append(" from  (");
            strSql.Append(" SELECT ROW_NUMBER() OVER (ORDER BY publishdate desc) AS RowNo, ");

            strSql.Append(" [BH],[topicbh],[Title],[Author],[PublishDate]");
            strSql.Append("  FROM J_Articles   ");
            if (strWhere.Trim() != "")
            {
                strSql.Append(" where " + strWhere);
            }

            strSql.Append(" ) as T ");
            if (PageSize != 0)
            {
                strSql.Append(" where RowNo>");
                strSql.Append((CurrentPage - 1) * PageSize);
            }

            DataTable dt = DbHelperSQL.Query(strSql.ToString()).Tables[0];

            m_article article;
            List<m_article> articles = new List<m_article>();
            foreach (DataRow row in dt.Rows)
            {
                article = new m_article();
                article.Title = row["title"].ToString();
                article.Author = row["author"].ToString();
                articles.Add(article);
            }
            return articles;
        }
        [WebMethod]//得到总分页数
        public int GetTotalPagers(string where,int PageSize)
        {
            decimal count = 0;
            StringBuilder sql = new StringBuilder();
            sql.Append("select count(1)   from J_Articles   ");
            if (where.Trim() != "")
            {
                sql.Append(" where " + where);
            }
            object obj = DbHelperSQL.GetSingle(sql.ToString());
            if (obj != null)
                count = decimal.Parse(obj.ToString());
            decimal a = count / PageSize;            
            return  int.Parse( Math.Ceiling(a).ToString());     

        }