Silverlight下的WCF服務之三：調用WCF服務從數據庫中取出數據顯示在datagrid中

本文在Silverlight中調用WCF服務，從sql server數據庫中取出customers表格數據，並顯示show在silverlight的datagrid控件中。

 

步驟1：創建StudentService wcf服務。

 

using System; using System.Collections.Generic; using System.Linq; using System.Runtime.Serialization; using System.ServiceModel; using System.Text; namespace WCFDemoService { public class StudentService : IStudentService { public List<Student> GetStudents(int NoOfRecords) { List<Student> studentList = new List<Student>(); Random rd = new Random(); for (int Idex = 1; Idex <= NoOfRecords; Idex++) { Student student = new Student(); student.StudentID = Idex; student.StudentName = "Student Name No." + Idex.ToString(); student.Score = (int) (60 + rd.NextDouble() * 40); student.EvaluationTime = System.DateTime.Now; studentList.Add(student); } return studentList; } } }  

 

實現IStudentService接口如下：

 

using System; using System.Collections.Generic; using System.Linq; using System.Runtime.Serialization; using System.ServiceModel; using System.Text; namespace WCFDemoService { [ServiceContract] public interface IStudentService { [OperationContract] List<Student> GetStudents(int NoOfRecords); } [DataContract] public class Student { private int studentID; private string studentName; private int score; private DateTime evaluationTime; [DataMember(Order = 1)] public int StudentID { get { return studentID; } set { studentID = value; } } [DataMember(Order = 2)] public string StudentName { get { return studentName; } set { studentName = value; } } [DataMember(Order = 3)] public int Score { get { return score; } set { score = value; } } [DataMember(Order = 4)] public DateTime EvaluationTime { get { return evaluationTime; } set { evaluationTime = value; } } } }  

 

步驟2：創建Silverlight項目，並引用剛纔創建的WCF服務。

 

xaml界面有一個button,一個datagrid控件。點擊按鈕調用WCF服務，從數據庫中取出表格，並顯示在datagrid控件中，如下：

 

<UserControl xmlns:data="clr-namespace:System.Windows.Controls;assembly=System.Windows.Controls.Data" x:Class="SilverlightWCFDemo.MainPage" xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation" xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml" xmlns:d="http://schemas.microsoft.com/expression/blend/2008" xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006" mc:Ignorable="d" d:DesignWidth="640" d:DesignHeight="480"> <Grid x:Name="LayoutRoot" Margin="20, 20, 20, 20"> <Button x:Name="btnMakeWCFCall" FontSize="12" Content="Make WCF Call" HorizontalAlignment="Right" VerticalAlignment="Center" Click="btnMakeWCFCall_Click"/> <StackPanel HorizontalAlignment="Center" Margin="0,20,0,20" Height="1200" > <data:DataGrid Name="dataGrid1" Height="1000" Width="600" AutoGenerateColumns="True" HorizontalAlignment="Center" /> </StackPanel> </Grid> </UserControl>  

 

後臺C#代碼如下：

 

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.ServiceModel; using System.Collections.ObjectModel; using System.Text; using SilverlightWCFDemo.StudentService; namespace SilverlightWCFDemo { public partial class MainPage : UserControl { private IDictionary<string, string> DeploymentConfigurations; public MainPage() { InitializeComponent(); App application = (App)Application.Current; DeploymentConfigurations = application.DeploymentConfigurations; StringBuilder SB = new StringBuilder(); SB.Append("Developed by "); SB.Append(DeploymentConfigurations["Author"]); SB.Append(" on "); SB.Append(DeploymentConfigurations["DevelopmentTime"]); //lblAuthorInformation.Text = SB.ToString(); this.Cursor = Cursors.Arrow; } private void btnClearWCFCallResult_Click(object sender, RoutedEventArgs e) { //dgResult.ItemsSource = null; GC.Collect(); } private void btnMakeWCFCall_Click(object sender, RoutedEventArgs e) { //ComboBoxItem aItem = (ComboBoxItem)cmbNoOfStudentRecords.SelectedItem; //if (aItem.Tag.ToString() == "*") //{ // MessageBox.Show("Please select the number of the student records to retrieve"); // return; //} int NoofStudentRecord = 20;//System.Convert.ToInt16(aItem.Tag.ToString()); AsyncCallback aSyncCallBack = delegate(IAsyncResult result) { ObservableCollection<StudentService.Student> studentList; try { studentList = ((StudentService.IStudentService)result.AsyncState).EndGetStudents(result); Deployment.Current.Dispatcher.BeginInvoke(() => { dataGrid1.ItemsSource = studentList.ToList();}); } catch (Exception ex) { Deployment.Current.Dispatcher.BeginInvoke(() => MessageBox.Show(ex.Message)); return; } }; WCFServiceFactory.GetInstance().iStudentService.BeginGetStudents( NoofStudentRecord, aSyncCallBack, WCFServiceFactory.GetInstance().iStudentService); } void proxy_GetStudentsCompleted(object sender, GetStudentsCompletedEventArgs e) { //throw new NotImplementedException(); if (e.Error != null) { MessageBox.Show(e.Error.Message); // bare bones return; } //ObservableCollection<StudentService.Student> studentList = new ObservableCollection<Student>(); //studentList = e.Result; //dgResult.ItemsSource = studentList.ToList(); List<Data> source = new List<Data>(); int itemsCount = 100; for (int i = 0; i < itemsCount; i++) { source.Add(new Data() { Column1 = "Data" + i, Column2 = "Second Column" + i, Column3 = i, Column4 = (i % 2 == 0) }); } // Bind the datagrid //dgResult.ItemsSource = source; } } }  

 

結果如下：

 

 

 

 

點擊按鈕，調用WCF服務，結果如下：