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Silverlight + RIA Service的SUID的实例

作者: subwayline13  来源: 博客园  发布时间: 2010-09-08 15:00  阅读: 4328 次  推荐: 0   原文链接   [收藏]  
摘要:WCF RIA Service网上也有一些例子,不过都比较简单,我把我的一个比较接近实际的例子跟大家分享分享。

  1、准备工作

  新建一个Silverlight Business Application,首先修改web.config,他自动生成的配置比较省略,我手动加入membership,role,profile的配置,我是ASP.NET MVC的项目中拷贝过来,直接用他的配置也可以,不过手动配置一下连接字符串LocalSqlServer,不然不能运行。
<membership>
<providers>
<clear />
<add name="AspNetSqlMembershipProvider" type="System.Web.Security.SqlMembershipProvider" connectionStringName="ApplicationServices" enablePasswordRetrieval="false" enablePasswordReset="true" requiresQuestionAndAnswer="false" requiresUniqueEmail="false" maxInvalidPasswordAttempts="5" minRequiredPasswordLength="6" minRequiredNonalphanumericCharacters="0" passwordAttemptWindow="10" applicationName="/Vega" />
</providers>
</membership>
<profile>
<providers>
<clear />
<add name="AspNetSqlProfileProvider" type="System.Web.Profile.SqlProfileProvider" connectionStringName="ApplicationServices" applicationName="/" />
</providers>
<properties>
<add name="FriendlyName" />
</properties>
</profile>
<roleManager enabled="true">
<providers>
<clear />
<add name="AspNetSqlRoleProvider" type="System.Web.Security.SqlRoleProvider" connectionStringName="ApplicationServices" applicationName="/Vega" />
<add name="AspNetWindowsTokenRoleProvider" type="System.Web.Security.WindowsTokenRoleProvider" applicationName="/" />
</providers>
</roleManager>

  我用的连接字符串名字是ApplicationServices,如果没安装ASP.NET的SQL数据,可以用Visual Studio 命令提示(2010) (在开始菜单的Visual Studio Tools里)调出命令提示符输入aspnet_regsql,调出“ASP.NET SQL SERVER安装向导”,而在运行-cmd里因为没有相关环境变量,是调不出安装向导的。

  新建一个ADO.NET实体数据模型。

  编译一下,然后新建Domain Service Class,勾上Course,如果不编译,那么数据实体模型是找不到的。我们需要Microsoft Silverlight 4 Toolkit,http://silverlight.codeplex.com/,没安装的话要先安装。

  2、用户登录和角色

  用户登录后往往要根据不用角色实现不同的功能导航,所以要修改/Views/Login/LoginStatus.xaml 这个登录状态的用户控件。首先加上管理员的功能面板。
<StackPanel x:Name="adminControls" Style="{StaticResource LoginPanelStyle}">
<!-- welcomeText.Text property's binding is setup in code-behind -->
<TextBlock x:Name="welcomeAdminText" Style="{StaticResource WelcomeTextStyle}" VerticalAlignment="Center"/>
<!-- welcomeText.Text property's binding is setup in code-behind -->
<TextBlock Text=" | " Style="{StaticResource SpacerStyle}"/>
<HyperlinkButton TargetName="ContentFrame" Content="课程" VerticalAlignment="Center" Foreground="White" NavigateUri="/Courses"/>
<TextBlock Text=" | " Style="{StaticResource SpacerStyle}"/>
<HyperlinkButton TargetName="ContentFrame" Content="学员" VerticalAlignment="Center" Foreground="White" NavigateUri="/Students"/>
<TextBlock Text=" | " Style="{StaticResource SpacerStyle}"/>
<HyperlinkButton TargetName="ContentFrame" Content="排课" VerticalAlignment="Center" Foreground="White" NavigateUri="/Schedules"/>
<TextBlock Text=" | " Style="{StaticResource SpacerStyle}"/>
<Button x:Name="adminLogoutButton" Content="{Binding ApplicationStrings.LogOffButton, Source={StaticResource ResourceWrapper}}"
Click
="LogoutButton_Click"
Style
="{StaticResource LoginRegisterLinkStyle}"
IsEnabled
="{Binding Authentication.IsLoggingOut, Converter={StaticResource NotOperatorValueConverter}}" />
</StackPanel>

  然后增加一个状态,叫做adminLoggedIn,在<vsm:VisualStateGroup x:Name="loginStates">代码短里加上adminLoggedIn的代码:

<vsm:VisualState x:Name="adminLoggedIn">
<Storyboard>
<ObjectAnimationUsingKeyFrames BeginTime="00:00:00" Storyboard.TargetName="logoutControls" Storyboard.TargetProperty="(UIElement.Visibility)">
<DiscreteObjectKeyFrame KeyTime="00:00:00.0000000">
<DiscreteObjectKeyFrame.Value>
<Visibility>Collapsed</Visibility>
</DiscreteObjectKeyFrame.Value>
</DiscreteObjectKeyFrame>
</ObjectAnimationUsingKeyFrames>
<ObjectAnimationUsingKeyFrames BeginTime="00:00:00" Storyboard.TargetName="loginControls" Storyboard.TargetProperty="(UIElement.Visibility)">
<DiscreteObjectKeyFrame KeyTime="00:00:00.0000000">
<DiscreteObjectKeyFrame.Value>
<Visibility>Collapsed</Visibility>
</DiscreteObjectKeyFrame.Value>
</DiscreteObjectKeyFrame>
</ObjectAnimationUsingKeyFrames>
</Storyboard>
</vsm:VisualState>

  不要忘了在其他的状态里加上把adminControls设置为不显示,只有在adminLoggedIn才显示管理员的功能导航。在构造器函数里加上welcomeAdminText的绑定:

public LoginStatus()
{
this.InitializeComponent();

this.welcomeText.SetBinding(TextBlock.TextProperty, WebContext.Current.CreateOneWayBinding("User.DisplayName", new StringFormatValueConverter(ApplicationStrings.WelcomeMessage)));
this.welcomeAdminText.SetBinding(TextBlock.TextProperty, WebContext.Current.CreateOneWayBinding("User.DisplayName", new StringFormatValueConverter(ApplicationStrings.WelcomeMessage)));
this.authService.LoggedIn += this.Authentication_LoggedIn;
this.authService.LoggedOut += this.Authentication_LoggedOut;
this.UpdateLoginState();
}

  修改UpdateLoginState函数,判断如果当前用户角色有admin,就显示admin的功能导航按钮:


private void UpdateLoginState()
{
if (WebContext.Current.User.IsAuthenticated)
{
VisualStateManager.GoToState(
this, (WebContext.Current.Authentication is WindowsAuthentication) ?
"windowsAuth" :
this.authService.User.IsInRole("admin") ? "adminLoggedIn" : "loggedIn", true);
}
else
{
VisualStateManager.GoToState(
this, "loggedOut", true);
}
}

  通过ASP.NET 网站配置加上个admin角色和用户。

  好了,用户程序登录之后判断有admin角色,登录后就显示管理员的功能导航了。

  3、绑定数据源

  新建一个课程页面,在Page页面上加上DomainDataSource,一种办法是通过数据源窗口直接拽页面上去。
  他会自动帮你建立一个riaDataSource,还有DataGrid。
  在DataGrid外面加一个BusyIndicator(他是Silverlight Toolkit的控件之一),如果BusyIndicator得IsBusy为Ture,那么会出现一个等待的提示,并且BusyIndicator包含的内容不可操作,所以要把BusyIndicator的IsBusy和DomainDataSource的IsBusy绑定起来: IsBusy="{Binding IsBusy, ElementName=courseDomainDataSource}" 。
  DataGrid已经和DomainDataSource绑定了,IDE帮我们自动加上代码: ItemsSource="{Binding Data, ElementName=courseDomainDataSource}"。
  我还要加个简单搜索,通过课程名称模糊搜索,加一个TextBox。
<TextBlock Margin="0,18,137,0" Text="课程名称" FontSize="12" HorizontalAlignment="Right" Width="48" Height="23" VerticalAlignment="Top" />
<TextBox Margin="0,15,0,0" x:Name="tbFilterCourseName" Height="23" VerticalAlignment="Top" HorizontalAlignment="Right" Width="120" />

  好了,然后拖一个DataPaper上去实现分页,也和DomainDataSource绑定上 Source="{Binding Data, ElementName=courseDomainDataSource}"。

  我们还要加上一排CheckBox用于多选,跟ASP.NET的GridView差不多,有一种DataGridTemplateColumn。CheckBox直接绑定实体对象,加上Tag="{Binding}",然后给CheckBox加上事件,在选中的把绑定的对象加入到一个List里,取消选中的时候在取出来,维护一个要删除对象的列表。

    private IList<Course> deletedCourses = new List<Course>();

private void CheckBox_Checked(object sender, RoutedEventArgs e)
{
var checkBox
= sender as CheckBox;
this.deletedCourses.Add(checkBox.Tag as Course);
}

private void CheckBox_Unchecked(object sender, RoutedEventArgs e)
{
var checkBox
= sender as CheckBox;
this.deletedCourses.Remove(checkBox.Tag as Course);
}

  另外加一个删除全部的按钮。下面是BusyIndicator的全部代码:

<toolkit:BusyIndicator x:Name="dataBusyIndicator" BusyContent="载入课程数据" IsBusy="{Binding IsBusy, ElementName=courseDomainDataSource}">
<Grid>
<sdk:DataGrid AutoGenerateColumns="False" ItemsSource="{Binding Data, ElementName=courseDomainDataSource}" x:Name="courseDataGrid" RowDetailsVisibilityMode="VisibleWhenSelected" Margin="30,47,0,33" IsReadOnly="True">
<sdk:DataGrid.Resources>
<DataTemplate x:Name="CheckBoxCellTemplate">
<CheckBox VerticalAlignment="Center" HorizontalAlignment="Center" Tag="{Binding}" Checked="CheckBox_Checked" Unchecked="CheckBox_Unchecked" />
</DataTemplate>
</sdk:DataGrid.Resources>
<sdk:DataGrid.Columns>
<sdk:DataGridTemplateColumn CanUserReorder="True" CanUserResize="True" CanUserSort="True" Width="30">
<sdk:DataGridTemplateColumn.CellEditingTemplate>
<StaticResource ResourceKey="CheckBoxCellTemplate"/>
</sdk:DataGridTemplateColumn.CellEditingTemplate>
</sdk:DataGridTemplateColumn>
<sdk:DataGridTextColumn x:Name="courseNameColumn" Binding="{Binding CourseName}" Header="课程名称" Width="SizeToCells" MinWidth="70" />
<sdk:DataGridTextColumn x:Name="titleColumn" Binding="{Binding Title}" Header="标题" Width="SizeToCells" MinWidth="100" />
<sdk:DataGridTextColumn x:Name="providerColumn" Binding="{Binding Provider}" Header="内容提供商" Width="SizeToCells" MinWidth="70" />
<sdk:DataGridTextColumn x:Name="teachersColumn" Binding="{Binding Teachers}" Header="主讲老师" Width="SizeToCells" MinWidth="70" />
<sdk:DataGridTextColumn x:Name="publishDateColumn" Binding="{Binding PublishDate}" Header="发布时间" Width="SizeToCells" MinWidth="70" />
<sdk:DataGridTextColumn x:Name="createTimeColumn" Binding="{Binding CreateTime}" Header="创建时间" Width="SizeToCells" MinWidth="70" />
</sdk:DataGrid.Columns>
</sdk:DataGrid>
<sdk:DataPager Margin="30,444,0,10" x:Name="dataPager1" PageSize="10" Source="{Binding Data, ElementName=courseDomainDataSource}" />
<TextBlock Margin="0,18,137,0" Text="课程名称" FontSize="12" HorizontalAlignment="Right" Width="48" Height="23" VerticalAlignment="Top" />
<TextBox Margin="0,15,0,0" x:Name="tbFilterCourseName" Height="23" VerticalAlignment="Top" HorizontalAlignment="Right" Width="120" />
<Button Content="删除所选" Height="23" HorizontalAlignment="Left" Margin="30,15,0,0" Name="button1" VerticalAlignment="Top" Width="75" Click="button1_Click" />
</Grid>
</toolkit:BusyIndicator>

  然后,要把DomainDataSource.FilterDescriptors的筛选和我刚才加的TextBox绑定起来,这样就自动搜索了。

<riaControls:DomainDataSource AutoLoad="True" Height="0" LoadedData="courseDomainDataSource_LoadedData" x:Name="courseDomainDataSource" QueryName="GetCoursesQuery" Width="0">
<riaControls:DomainDataSource.SortDescriptors>
<riaControls:SortDescriptor Direction="Descending" PropertyPath="CourseID" />
</riaControls:DomainDataSource.SortDescriptors>
<riaControls:DomainDataSource.FilterDescriptors>
<riaControls:FilterDescriptor Operator="Contains" PropertyPath="CourseName" IgnoredValue="" Value="{Binding Text, ElementName=tbFilterCourseName}" />
</riaControls:DomainDataSource.FilterDescriptors>
<riaControls:DomainDataSource.DomainContext>
<my1:VegaContext />
</riaControls:DomainDataSource.DomainContext>
</riaControls:DomainDataSource>

  如果不加FilterDescriptors,那么分页的时候报错,因为分页前必须Order,也可以在后台加一个默认排序:

public IQueryable<Course> GetCourses()
{
return this.ObjectContext.Courses.OrderByDescending<Course, int>(c => c.CourseID);
}

  效果如下:

  4、删除全部选择的项目。

  只需要逐个删除列表中的对象,然后DomainDataSource.SubmitChanges()就行了,很方便吧。

private void button1_Click(object sender, RoutedEventArgs e)
{
var result
= MessageBox.Show("确定删除该课程?删除后不可恢复!", "提示", MessageBoxButton.OKCancel);
if (result == MessageBoxResult.OK)
{
foreach (var course in this.deletedCourses)
{
this.courseDomainDataSource.DataView.Remove(course);
}
this.deletedCourses.Clear();
this.courseDomainDataSource.SubmitChanges();
}
}

  5、上传图片

  我需要一个上传图片的功能,首先需要后台支持,建一个DomainService专门负责上传。
[EnableClientAccess()]
public class UploadService : DomainService
{
public string Upload(byte[] stream,string extension)
{
var rootPath
= HttpContext.Current.Server.MapPath("/Uploads");
var datePath
= DateTime.Now.ToString("yyyyMMdd");
var dirPath
= Path.Combine(rootPath, datePath);
if (!Directory.Exists(dirPath))
{
Directory.CreateDirectory(dirPath);
}

var fileName
= Guid.NewGuid().ToString() + extension;
using (var fileStream = new FileStream(
Path.Combine(dirPath, fileName), FileMode.Create, FileAccess.Write))
{
fileStream.Write(stream,
0, stream.Length);
fileStream.Flush();
fileStream.Close();
}
return "/Uploads/" + datePath + "/" + fileName;
}
}

  代码很简单,就一个方法,将传过来的字节流保存到服务器上,然后返回为这个文件自动生成的路径。

  在服务器端建一个DomainService后,客户端会自动生成调用的代码,真的很方便。在客户端直接实例化一个Context就能用了 private UploadContext uploadContext = new UploadContext();在Silverlight建一个用户控件,专门负责上传和现实图片。

<UserControl xmlns:toolkit="http://schemas.microsoft.com/winfx/2006/xaml/presentation/toolkit" x:Class="Vega.Controls.SelecteImage"
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:DesignHeight
="300" d:DesignWidth="400">
<toolkit:BusyIndicator Name="busyIndicator">
<StackPanel Margin="0" Orientation="Horizontal">
<Image HorizontalAlignment="Left" VerticalAlignment="Top" Source="/Vega;component/Assets/Icons/picture2.png" MaxWidth="150" MaxHeight="150" Name="image" />
<Button x:Name="btnSelected" Content="选择" Margin="8,0,0,0" HorizontalAlignment="Left" VerticalAlignment="Bottom" Click="btnSelected_Click" />
</StackPanel>
</toolkit:BusyIndicator>
</UserControl>

  点击选择按钮,出现一个文件选择框,然后将选中文件上传到服务器,将返回的图片路径复制给Image控件:

private void btnSelected_Click(object sender, RoutedEventArgs e)
{
var fileDialog
= new OpenFileDialog()
{
Filter
= "图片(.jpg)|*.jpg|图片(.jpeg)|*.jpeg|图片(.png)|*.png",
Multiselect
= false
};

var result
= fileDialog.ShowDialog();
if (result.HasValue && result.Value)
{
var stream
= fileDialog.File.OpenRead();
var bytes
= new byte[stream.Length];
stream.Read(bytes,
0, bytes.Length);
this.busyIndicator.IsBusy = true;
var op
= this.uploadContext.Upload(bytes, fileDialog.File.Extension);
op.Completed
+= (opSender, opE) => {
this.ImageUri = new Uri(op.Value, UriKind.Relative);
this.busyIndicator.IsBusy = false;
};
}
}

  然后,我为控件加了一个属性,ImageUrl暴露给外面,提供绑定什么的功能。

public static readonly DependencyProperty ImageUriProperty = DependencyProperty.Register(
"ImageUri",
typeof(Uri),
typeof(SelecteImage),
new PropertyMetadata(null , new PropertyChangedCallback(OnImageUriChanged)));

private static void OnImageUriChanged(DependencyObject d, DependencyPropertyChangedEventArgs e)
{
((SelecteImage)d).OnImageUriChanged(e);
}

protected virtual void OnImageUriChanged(DependencyPropertyChangedEventArgs e)
{
if (e.NewValue == null)
{
return;
}
var uri
= (Uri)e.NewValue;
if (!uri.IsAbsoluteUri)
{
//Application.Current.Host.Source
var source = Application.Current.Host.Source;
uri
= new Uri(String.Format("{0}://{1}:{2}{3}",source.Scheme,source.Host,source.Port,uri.OriginalString), UriKind.Absolute);
}
this.image.Source = new BitmapImage(uri);
}

public Uri ImageUri
{
get { return (Uri)GetValue(ImageUriProperty); }
set { SetValue(ImageUriProperty, value); }
}

  由于Silverlight中的相对Uri并不是只服务器上的资源,而是指XAP文件中的资源,所以我吧相对地址改为绝对地址。

  这个图片上传控件就OK乐。

  6、DataForm,实现新增和编辑

  首先拖上去一个DataForm控件,然后将DataForm和DomainService绑定起来。ItemsSource="{Binding ElementName=courseDomainDataSource, Path=Data}" CurrentItem="{Binding ElementName=courseDomainDataSource, Path=DataCurrentItem}",ItemSource绑定的是数据源,CurrentItem绑定时当前项目,如果不绑定ItemSource,只绑定CurrentItem的话就可以用CurrentItem="{Binding ElementName=courseDomainDataSource, Path=Data.CurrentItem}",不过如果这样的话,就只能编辑不能新增了。DataForm有很多按钮,比如导航的,编辑的,删除的,我只需需要增加和编辑,CommandButtonsVisibility="Add, Edit, Commit, Cancel",如果需要全部按钮的话CommandButtonsVisibility="All"就行了。
  另外,外面要重新设置DataForm的字段,把刚才做的上传图片的控件加进入,我需要编辑EditDataTemplate。
<toolkit:BusyIndicator Grid.Column="1" x:Name="formBusyIndicator" IsBusy="{Binding IsBusy, ElementName=courseDomainDataSource}" />
<toolkit:DataForm Grid.Column="1" Margin="30,18,30,12" x:Name="dfCourse" AutoEdit="False" ItemsSource="{Binding ElementName=courseDomainDataSource, Path=Data}" CurrentItem="{Binding CurrentItem}" AutoGenerateFields="False" AutoCommit="False" EditEnded="dfCourse_EditEnded" CommandButtonsVisibility="Add, Edit, Commit, Cancel">
<toolkit:DataForm.Resources>
<DataTemplate x:Key="EditDataTemplate">
<StackPanel>
<toolkit:DataField Label="课程名称:" Margin="0,0,0,8">
<TextBox Text="{Binding CourseName, Mode=TwoWay}" />
</toolkit:DataField>
<toolkit:DataField Label="标题:" Margin="0,0,0,8">
<TextBox Text="{Binding Title, Mode=TwoWay}" />
</toolkit:DataField>
<toolkit:DataField Label="子标题:" Margin="0,0,0,8">
<TextBox Text="{Binding SubTitle, Mode=TwoWay}" />
</toolkit:DataField>
<toolkit:DataField Label="短标题:" Margin="0,0,0,8">
<TextBox Text="{Binding ShortTitle, Mode=TwoWay}" />
</toolkit:DataField>
<toolkit:DataField Label="主讲老师:" Margin="0,0,0,8">
<TextBox Text="{Binding Teachers, Mode=TwoWay}" />
</toolkit:DataField>
<toolkit:DataField Label="提供商:" Margin="0,0,0,8">
<TextBox Text="{Binding Provider, Mode=TwoWay}" />
</toolkit:DataField>
<toolkit:DataField Label="发布时间:" Margin="0,0,0,8">
<sdk:DatePicker SelectedDate="{Binding PublishDate, Mode=TwoWay}" />
</toolkit:DataField>
<toolkit:DataField Label="概要:" Margin="0,0,0,8">
<TextBox Text="{Binding Summary, Mode=TwoWay}" Height="120" HorizontalScrollBarVisibility="Auto" VerticalScrollBarVisibility="Auto" AcceptsReturn="True" />
</toolkit:DataField>
<toolkit:DataField Label="图片:" Margin="0,0,0,8">
<Vega_Controls:SelecteImage ImageUri="{Binding ThumbUrl, Mode=TwoWay}" Margin="0" d:LayoutOverrides="Width, Height"/>
</toolkit:DataField>
</StackPanel>
</DataTemplate>
</toolkit:DataForm.Resources>
<toolkit:DataForm.EditTemplate>
<StaticResource ResourceKey="EditDataTemplate"/>
</toolkit:DataForm.EditTemplate>
</toolkit:DataForm>
把SelectImage的ImageUrl属性和实体的属性绑定起来。
  效果图。
  最后加上事件,在完成编辑的时候提交更改就好了。
private void dfCourse_EditEnded(object sender, DataFormEditEndedEventArgs e)
{
if (e.EditAction == DataFormEditAction.Commit)
{
var course
= (Course)this.courseDataGrid.SelectedItem;
if (course.CourseID == 0)
{
course.CreateTime
= DateTime.Now;
}
this.courseDomainDataSource.SubmitChanges();
}
}
  最后最后,加上验证。直接修改DomainService.matadata.cs和ASP.NET MVC2集成的验证方式一样,使用Attribute的方式:
[Display(Name="课程名称")]
[Required(ErrorMessage
="课程名称不能为空")]
public string CourseName { get; set; }
  不过效果好多了
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标签:Silverlight RIA

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