Silverlight+WCF+Sql Server

这是来公司后做的第三个实例项目，功能是Silverlight+WCF+Sql Server实现对数据库数据的增删改查。过程中也遇到一些问题。不过还好解决了！刚开始以为自己做不出来呢，没想到竟然成功了！值此十一国庆佳节之际特此记录！祝大家国庆快乐！解决方案如下：

创建过程：1.打开VS，创建silverlight程序，选择web站点承载silverlight程序；2.在web项目中添加wcf服务，添加契约并实现相应功能；WCF契约：

 public interface IUserService{[OperationContract]List<User> RetrieveUser();[OperationContract]bool CreateUser(int userID, string userName);[OperationContract]bool UpdateUser(int userID, string userName);[OperationContract]bool DeleteUser(int userID);}[DataContract]public class User{[DataMember]public int UserId {get; set;}[DataMember]public string UserName { get; set; }}

WCF契约实现：

 //查询用户public List<User> RetrieveUser(){List<User> user = new List<User>();try{SqlConnection _sqlConnection =new SqlConnection("Database=test1;Server=服务器名;Integrated Security=false;password=123;user id=sa;");_sqlConnection.Open();SqlDataAdapter da = new SqlDataAdapter("SELECT * FROM [User] ", _sqlConnection);DataSet ds = new DataSet();da.Fill(ds);foreach (DataRow row in ds.Tables[0].Rows){User a = new User();a.UserId =(int) row["UserId"];a.UserName =(string) row["UserName"];user.Add(a);}return user;}catch (Exception ex){user.Clear();return user;}}//创建用户public bool CreateUser(int userID, string userName){try{SqlConnection _sqlConnection = new SqlConnection("Database=test1;Server=服务器名;Integrated Security=false;password=123;user id=sa;");_sqlConnection.Open();SqlCommand command = new SqlCommand();command.Connection = _sqlConnection;command.CommandType = CommandType.Text;command.CommandText = "INSERT INTO [User]  ([UserId],[UserName]) VALUES ('" + userID+ "','" + userName+ "')";command.ExecuteNonQuery();_sqlConnection.Close();return true;}catch (Exception ex){return false;}}//更新用户public bool UpdateUser(int userID, string userName){try{SqlConnection _sqlConnection = new SqlConnection("Database=test1;Server=服务器名;Integrated Security=false;password=123;user id=sa;");_sqlConnection.Open();SqlCommand command = new SqlCommand();command.Connection = _sqlConnection;command.CommandType = CommandType.Text;command.CommandText = "UPDATE [User] SET [UserName] = " +userName + "WHERE [UserId] = " + userID;command.ExecuteNonQuery();_sqlConnection.Close();return true;}catch (Exception ex){return false;}}//删除用户public bool DeleteUser(int userID){try{SqlConnection _sqlConnection = new SqlConnection("Database=test1;Server=服务器名;Integrated Security=false;password=123;user id=sa;");_sqlConnection.Open();SqlCommand command = new SqlCommand();command.Connection = _sqlConnection;command.CommandType = CommandType.Text;command.CommandText = "DELETE [User] WHERE [UserId] =" + userID;command.ExecuteNonQuery();_sqlConnection.Close();return true;}catch (Exception ex){return false;}}

3.在silverlight中添加wcf的服务引用。MainPage前台：

 <Grid x:Name="LayoutRoot" Background="White"><StackPanel HorizontalAlignment="Center" VerticalAlignment="Center"><StackPanel VerticalAlignment="Center" HorizontalAlignment="Center"><StackPanel Orientation="Horizontal"><TextBlock TextAlignment="Center" VerticalAlignment="Center">UserId:</TextBlock><TextBox x:Name="userid" Width="76" Margin="21,0,0,0"></TextBox></StackPanel></StackPanel><StackPanel Margin="0,10,0,0" HorizontalAlignment="Center" VerticalAlignment="Center"><StackPanel Orientation="Horizontal"><TextBlock VerticalAlignment="Center" TextAlignment="Center" HorizontalAlignment="Center">UserName:</TextBlock><TextBox x:Name="username" Width="76"></TextBox></StackPanel></StackPanel><StackPanel Orientation="Horizontal" HorizontalAlignment="Center" VerticalAlignment="Center"><StackPanel Margin="0,10,0,0"><Button x:Name="btnselect" Click="btnselect_Click" Margin="30,0,0,0">SelectButton</Button></StackPanel><StackPanel Margin="0,10,0,0"><Button x:Name="btnupdate" Click="btnupdate_Click" Margin="10,0,0,0">UpdateButton</Button></StackPanel><StackPanel Margin="0,10,0,0"><Button Click="deleteButton_Click" Margin="10,0,0,0">DeleteButton</Button></StackPanel><StackPanel Margin="0,10,0,0"><Button x:Name="btncreate" Click="btncreate_Click" Margin="10,0,0,0">CreateButton</Button></StackPanel></StackPanel><StackPanel></StackPanel><StackPanel Height="165" Margin="0,10,0,0"><sdk:DataGrid  AutoGenerateColumns="False" Height="152" Name="dataGrid1" Width="144" DataContext="{Binding}" SelectionChanged="dataGrid1_SelectionChanged"><sdk:DataGrid.Columns><sdk:DataGridTextColumn Binding="{Binding UserId,Mode=TwoWay}" CanUserReorder="True" CanUserResize="True" CanUserSort="True" Header="UserId" Width="Auto" /><sdk:DataGridTextColumn  Binding="{Binding UserName,Mode=TwoWay}" CanUserReorder="True" CanUserResize="True" CanUserSort="True" Header="UserName" Width="Auto" /></sdk:DataGrid.Columns></sdk:DataGrid></StackPanel></StackPanel></Grid>

MainPage后台：

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 LYY.UserService;namespace LYY{public partial class MainPage : UserControl{public MainPage(){InitializeComponent();}void deleteButton_Click(object sender, RoutedEventArgs e){UserServiceClient userSvcClient = new UserServiceClient();int userID;userID = Convert.ToInt32(this.userid.Text);userSvcClient.DeleteUserCompleted += new EventHandler<DeleteUserCompletedEventArgs> (userSvcClient_DeleteUserCompleted);userSvcClient.DeleteUserAsync(userID);}void userSvcClient_DeleteUserCompleted(object sender,DeleteUserCompletedEventArgs e){if (e.Error == null){MessageBox.Show("删除用户成功！");}else{MessageBox.Show("删除用户失败！");}}private void btncreate_Click(object sender, RoutedEventArgs e){UserServiceClient client = new UserServiceClient();int userID;userID = Convert.ToInt32(this.userid.Text);string username = this.username.Text;client.CreateUserCompleted += new EventHandler<CreateUserCompletedEventArgs>(client_create);client.CreateUserAsync(userID, username);}void client_create(object sender, CreateUserCompletedEventArgs e){if (e.Result){MessageBox.Show("用户创建成功！");}else{MessageBox.Show("用户创建成功！");}}private void btnupdate_Click(object sender, RoutedEventArgs e){UserServiceClient client = new UserServiceClient();int userID;userID = Convert.ToInt32(this.userid.Text);string username = this.username.Text;client.UpdateUserCompleted += new EventHandler<UpdateUserCompletedEventArgs>(client_update);client.UpdateUserAsync(userID, username);}void client_update(object sender, UpdateUserCompletedEventArgs e){if (e.Result){MessageBox.Show("用户更新成功！");}else{MessageBox.Show("用户更新成功！");}}private void btnselect_Click(object sender, RoutedEventArgs e){UserServiceClient client = new UserServiceClient();client.RetrieveUserCompleted += new EventHandler<RetrieveUserCompletedEventArgs>(client_select);client.RetrieveUserAsync();}void client_select(object sender,RetrieveUserCompletedEventArgs e){if (e.Error==null){this.dataGrid1.ItemsSource = e.Result;}}private void dataGrid1_SelectionChanged(object sender, SelectionChangedEventArgs e){User current = new User();current = (User)this.dataGrid1.SelectedItem;this.userid.Text = Convert.ToString(current.UserId);this.username.Text = current.UserName;}}}