.NET RIA Service入门系列文章五：Silverlight 3操作数据库

在Silverlight中，数据的展示和操作有很多种方式，这里只介绍简单的方法，以达到让初学者有一个概念性的理解和认识。

1.Silverlight项目中的命名空间引用,请对下照下图引用相应命名空间:

image.png(16.25 K)

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2.以下是MainPage.xaml的内容:

1:  <UserControl

2:      xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation" 

3:      xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"

4:      xmlns:d="http://schemas.microsoft.com/expression/blend/2008" xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006" 

5:      mc:Ignorable="d" xmlns:data="clr-namespace:System.Windows.Controls;assembly=System.Windows.Controls.Data" x:Class="funsl.com.MainPage"

6:      d:DesignWidth="640" d:DesignHeight="480">

7:    <Grid x:Name="LayoutRoot">

8:        <data:DataGrid x:Name="GirdView1" Margin="116,88,236,193"/>

9:        <Button x:Name="bt_add" Height="31" HorizontalAlignment="Left" Margin="60,0,0,109" VerticalAlignment="Bottom" Width="118" Content="添加"/>

10:        <Button x:Name="bt_edit" Height="31" Margin="214,0,308,109" VerticalAlignment="Bottom" Content="修改"/>

11:        <Button x:Name="bt_del" Height="31" HorizontalAlignment="Right" Margin="0,0,151,109" VerticalAlignment="Bottom" Width="118" Content="删除"/>

12:    </Grid>

13:  </UserControl>

定义了一个Gridview控件用来显示数据,三个按扭控件分别是添加、修改、删除。

3.以下是MainPage.xaml.cs文件代码部份。也就是我们开始通过.net ria service操作数据库了。

1:  using System;

2:  using System.Collections.Generic;

3:  using System.Linq;

4:  using System.Net;

5:  using System.Windows;

6:  using System.Windows.Controls;

7:  using System.Windows.Documents;

8:  using System.Windows.Input;

9:  using System.Windows.Media;

10:  using System.Windows.Media.Animation;

11:  using System.Windows.Shapes;

12:  //引用funsl.com.web空间

13:  using funsl.com.Web;

14:  

15:  namespace funsl.com

16:  {

17:      public partial class MainPage : UserControl

18:      {

19:          //定义一个Domain Data Class，即是我们之有在funsl.com.Web里定义的那个

20:          FunSLDomainContext funSLContext;

21:  

22:          public MainPage()

23:          {

24:              InitializeComponent();

25:  

26:              //实例化FunSLDomainContext

27:              funSLContext = new FunSLDomainContext();

28:  

29:              LoadDataAndDisplay();

30:  

31:              //注册添加功能的button点击事件

32:              bt_add.Click += new RoutedEventHandler(bt_add_Click);

33:              //注册修改功能的button点击事件

34:              bt_edit.Click += new RoutedEventHandler(bt_edit_Click);

35:              //注册删除功能的button点击事情

36:              bt_del.Click += new RoutedEventHandler(bt_del_Click);

37:  

38:          }

39:  

40:          //此方法为显示所有数据

41:          void LoadDataAndDisplay()

42:          {

43:              //把gridview控件的数据源与DomainContext绑定

44:              GirdView1.ItemsSource = funSLContext.FunSLUsers;

45:              //开始开载数据

46:              funSLContext.Load(funSLContext.GetFunSLUsersQuery());

47:          }

48:  

49:          //添加工作

50:          void bt_add_Click(object sender, RoutedEventArgs e)

51:          {

52:              //新建一个FunSLUsers并设定相关值，不同的资料请自行修改

53:              FunSLUsers newUser = new FunSLUsers();

54:              newUser.userId = "FunSl.User";

55:              newUser.age = 25;

56:              newUser.address = "HK";

57:  

58:              //把新的FunSLUsers添加到DomainContext中

59:              funSLContext.FunSLUsers.Add(newUser);

60:              //把DomainContext的变动更新到数据库

61:              funSLContext.SubmitChanges();

62:  

63:              //提示

64:              MessageBox.Show("提交完成");

65:          }

66:  

67:          //修改工作

68:          void bt_edit_Click(object sender, RoutedEventArgs e)

69:          {

70:              //重选中的dataview中还原FunSlUsers实例

71:              FunSLUsers user = (FunSLUsers)GirdView1.SelectedItem;

72:  

73:              //这里我要修改选中用户的userId为eidted

74:              user.userId = "edited";

75:  

76:              //把修改变动更新到数据库

77:              funSLContext.SubmitChanges();

78:  

79:              //提示

80:              MessageBox.Show("修改完成");

81:          }

82:  

83:          //删除工作

84:          void bt_del_Click(object sender, RoutedEventArgs e)

85:          {

86:              //重选中的dataview中还原FunSlUsers实例

87:              FunSLUsers user = (FunSLUsers)GirdView1.SelectedItem;

88:  

89:              //从DomainContext中移除user

90:              funSLContext.FunSLUsers.Remove(user);

91:  

92:              //把修改变动更新到数据库

93:              funSLContext.SubmitChanges();

94:          }

95:      }

96:  }

到此基本的应用已经完成，须然还有很我.net ria service的特性没有讲述，监于本系列是专为初学者入门而写，所以不想作更多复杂的讲述，希望本系列文章可以为.net ria serivce入门的朋友有所帮助。