silverlight mvvm light + WCF RIA

Step 1: Create an empty Solution.

Step 2: Add an Empty Web Project:

Step 3: Add Silverlight Class Library (works on SL5)

Step 4: Add MVVM light 5

Step 5: Link .Web to Silverlight Application:

.Web -> Properties -> Silverlight -> Add SilverLight Project

remove .aspx start file generated by the link (in this example MvvmRIASample.SLTestPage.aspx)
and rename MvvmRIASample.SLTestPage.html to index.html and make it start page.

Step 6: Add Folder Models to .Web (where the .emdx is created)

COMPILE!!!

Step 7: Add Folder Service to .Web

Step 8: Link .Core to .Web (WCF RIA Service Link) through .Core Properties

Step 9:  Make .SL depend on .Core

Step 10: Add the same references that .Core has to .SL

- System.ComponentModel.DataAnnotations
- System.ServiceModel
- System.ServiceModel.DomainServices.Client
- System.ServiceModel.DomainServices.Client.Web
- System.ServiceModel.Web.Extensions

Step 11: Make the previous .DLL do NOT copy in LOCAL (in .Core) to avoid duplication in the final executable.

Step 12: Modify MainViewModel.cs (to test that everything is working correctly)

adding the following:

using MvvmRIASample.Web.Models;
using MvvmRIASample.Web.Services;
using System.Linq;

        #region Welcome
        public const string WelcomePropertyName = "Welcome";

        private string _welcome = "";

        public string Welcome
        {
            get
            {
                return _welcome;
            }

            set
            {
                if (_welcome == value)
                {
                    return;
                }

                var oldValue = _welcome;
                _welcome = value;

                RaisePropertyChanged(WelcomePropertyName);

            }
        }
        #endregion

        public MainViewModel()

        {

            if (IsInDesignMode)

            {

                Welcome = "Design Data";

            }

            else

            {

                AWDomainServices context = new AWDomainServices();

                context.Load(context.GetProductsQuery(), (result =>

                {

                    if (!result.HasError)

                    {

                        Product first = result.Entities.FirstOrDefault();

                        if (first != null)

                        {

                            Welcome = first.Name;

                        }

                    }

                }), null);

            }

        }

Add Authentication Service

Step 13: Add the following in web.config in .Web project

<!--<system.web>-->
<!--  <compilation debug="true" targetFramework="4.0" />-->
  <authentication mode="Forms"></authentication>
  <roleManager enabled="true"></roleManager>
  <profile enabled="true">
    <properties>
      <add type="System.Int32" defaultValue="10" name="DefaultRows"/> <!-- test -->
    </properties>
  </profile>
<!-- </system.web>-->

Step 14: Add "Authentication Domain Service" to .Web (Services\AuthenticationDomainService.cs)

Step 15: Oepn AuthenticationDomainService.cs and add the following

[EnableClientAccess]
public class AuthenticationDomainService : AuthenticationBase<User>
{
}

public class User : UserBase
{
    public int DefaultRows { get; set; }
}

And build the solution.

Step 16: Create an Test User using ASP.NET Web Site Administration Tool

Step 17: Manually create the class WebContext.cs in .Core

    public sealed partial class WebContext: WebContextBase
    {
        partial void OnCreated();

        public WebContext()
        {
            this.OnCreated();
        }

        public new static WebContext Current
        {
            get
            {
                return ((WebContext)(WebContextBase.Current));
            }
        }

        public new User User
        {
            get
            {
                return ((User)(base.User));
            }
        }
    }

Step 18: Configuring the Client for Authentication

in App.xaml.c 

        public App()
        {
            Startup += Application_Startup;
            Exit += Application_Exit;
            UnhandledException += Application_UnhandledException;

            InitializeComponent();

            /////////////////////// added
            WebContext webContext = new WebContext();
            webContext.Authentication = new FormsAuthentication();
            this.ApplicationLifetimeObjects.Add(webContext);
        }

        private void Application_Startup(object sender, StartupEventArgs e)
        {
            /// Added Code
            ((WebAuthenticationService)WebContext.Current.Authentication).DomainContext = new MultiTier.Web.AuthenticationDomainContext();
            this.Resources.Add("WebContext", WebContext.Current);
            //////////////////

            RootVisual = new MainPage();
            DispatcherHelper.Initialize();
        }

Step 19: Adding Login Functionality to the Client (step 19 is to add some code to see it works)

Add the following snippet to MainPage.xaml: 

            <TextBlock x:Name="WelcomeText" Visibility="Collapsed"></TextBlock>
            <HyperlinkButton x:Name="LogoutButton" 
                 Content="Logout" 
                 Click="LogoutButton_Click" 
                 Visibility="Collapsed">
            </HyperlinkButton>
            <Border x:Name="LoginBorder" 
        Margin="10,10,0,0" 
        BorderThickness="2" 
        BorderBrush="Black" 
        HorizontalAlignment="Left" 
        CornerRadius="15" 
        Padding="10" 
        Background="BlanchedAlmond" 
        Width="300">
                <Grid HorizontalAlignment="Left">
                    <Grid.RowDefinitions>
                        <RowDefinition></RowDefinition>
                        <RowDefinition Height="30" ></RowDefinition>
                        <RowDefinition Height="30"></RowDefinition>
                        <RowDefinition></RowDefinition>
                        <RowDefinition></RowDefinition>
                    </Grid.RowDefinitions>
                    <Grid.ColumnDefinitions>
                        <ColumnDefinition></ColumnDefinition>
                        <ColumnDefinition></ColumnDefinition>
                    </Grid.ColumnDefinitions>
                    <TextBlock Grid.Row="0" 
                   Grid.ColumnSpan="2" 
                   Grid.Column="0" 
                   FontWeight="Bold" 
                   HorizontalAlignment="Left" 
                   VerticalAlignment="Center" 
                   Text="Log In Existing User">
                    </TextBlock>
                    <TextBlock Grid.Row="1" 
                   Grid.Column="0" 
                   HorizontalAlignment="Right" 
                   VerticalAlignment="Center" 
                   Text="User Name: ">
                    </TextBlock>
                    <TextBox x:Name="UserName" 
                 VerticalAlignment="Center" 
                 Grid.Row="1" 
                 Grid.Column="1"  
                 Width="100">
                    </TextBox>
                    <TextBlock Grid.Row="2" 
                   HorizontalAlignment="Right" 
                   Grid.Column="0" 
                   VerticalAlignment="Center" 
                   Text="Password: ">
                    </TextBlock>
                    <PasswordBox x:Name="Password" 
                     VerticalAlignment="Center" 
                     Grid.Row="2" 
                     Grid.Column="1"  
                     Width="100">
                    </PasswordBox>
                    <TextBlock x:Name="LoginResult" 
                   TextWrapping="Wrap" 
                   Visibility="Collapsed" 
                   Grid.Row="3" 
                   Grid.ColumnSpan="2" 
                   Foreground="Red">
                    </TextBlock>
                    <Button x:Name="LoginButton" 
                Margin="0,5,0,0" 
                Grid.Row="4" 
                Grid.Column="1" 
                Content="Log In" 
                Click="LoginButton_Click">
                    </Button>
                </Grid>
            </Border>

and following codes to MainPage.xaml.cs


        protected void OnNavigatedTo(NavigationEventArgs e)
        {
            SetControlVisibility(WebContext.Current.User.IsAuthenticated);
        }

        private void LoginButton_Click(object sender, RoutedEventArgs e)
        {
            LoginParameters lp = new LoginParameters(UserName.Text, Password.Password);
            WebContext.Current.Authentication.Login(lp, this.LoginOperation_Completed, null);
            LoginButton.IsEnabled = false;
            LoginResult.Text = "";
        }

        private void LoginOperation_Completed(LoginOperation lo)
        {
            if (lo.HasError)
            {
                LoginResult.Text = lo.Error.Message;
                LoginResult.Visibility = System.Windows.Visibility.Visible;
                lo.MarkErrorAsHandled();
            }
            else if (lo.LoginSuccess == false)
            {
                LoginResult.Text = "Login failed. Please check user name and password.";
                LoginResult.Visibility = System.Windows.Visibility.Visible;
            }
            else if (lo.LoginSuccess == true)
            {
                SetControlVisibility(true);
            }
            LoginButton.IsEnabled = true;
        }

        private void SetControlVisibility(bool isAuthenticated)
        {
            if (isAuthenticated)
            {
                LoginBorder.Visibility = System.Windows.Visibility.Collapsed;
                WelcomeText.Text = "Welcome " + WebContext.Current.User.Name;
                WelcomeText.Visibility = System.Windows.Visibility.Visible;
                LogoutButton.Visibility = System.Windows.Visibility.Visible;
            }
            else
            {
                LoginBorder.Visibility = System.Windows.Visibility.Visible;
                WelcomeText.Visibility = System.Windows.Visibility.Collapsed;
                LogoutButton.Visibility = System.Windows.Visibility.Collapsed;
            }
        }

        private void LogoutButton_Click(object sender, RoutedEventArgs e)
        {
            WebContext.Current.Authentication.Logout(this.LogoutOperation_Completed, null);
        }

        private void LogoutOperation_Completed(LogoutOperation lo)
        {

            if (!lo.HasError)
            {
                SetControlVisibility(false);
            }
            else
            {
                //ErrorWindow ew = new ErrorWindow("Logout failed.", "Please try logging out again.");
                //ew.Show();
                lo.MarkErrorAsHandled();
            }
        }

DataGrid/Textbox Master/Detail in XAML

MainPage.xaml


    <Grid x:Name="LayoutRoot" Background="White">
        <StackPanel Orientation="Horizontal">
            <sdk:DataGrid Name="grid" Margin="10" AutoGenerateColumns="False">
                <sdk:DataGrid.Columns>
                    <sdk:DataGridTextColumn Header="Name" Binding="{Binding Name}" />
                    <sdk:DataGridTextColumn Header="Age" Binding="{Binding Age}" />
                </sdk:DataGrid.Columns>
            </sdk:DataGrid>


            <StackPanel>
                <sdk:DataGrid Name="gBooks" Margin="10" AutoGenerateColumns="False" DataContext="{Binding SelectedItem, ElementName=grid}" ItemsSource="{Binding Books}">
                    <sdk:DataGrid.Columns>
                        <sdk:DataGridTextColumn Header="Title" Binding="{Binding Title}" />
                        <sdk:DataGridTextColumn Header="Code" Binding="{Binding Code}" />
                    </sdk:DataGrid.Columns>
                </sdk:DataGrid>
                <StackPanel DataContext="{Binding SelectedItem, ElementName=grid}" Orientation="Horizontal">
                    <TextBlock Text="{Binding Name}"  />
                    <CheckBox IsChecked="{Binding isMale}" />
                </StackPanel>
            </StackPanel>
        </StackPanel>
    </Grid>







CodeBehind:


    public partial class MainPage : UserControl
    {
        public MainPage()
        {
            InitializeComponent();
            this.Loaded += new RoutedEventHandler(MainPage_Loaded);
            
        }


        void MainPage_Loaded(object sender, RoutedEventArgs e)
        {
            grid.ItemsSource = GridData.GetData();
        }
    }


    public class GridData
    {
        public string Name { get; set; }
        public int Age { get; set; }
        public bool isMale { get; set; }
        public IEnumerable<Book> Books { get; set; }


        public class Book
        {
            public string Title { get; set; }
            public string Code { get; set; }
        };


        public static ObservableCollection<GridData> GetData()
        {
            ObservableCollection<GridData> data = new ObservableCollection<GridData>
            {
                new GridData { Name = "John Doe", Age = 30, isMale = true, 
                    Books = new List<Book> {
                        new Book {Title = "suits", Code = "123"},
                        new Book {Title = "Condors 1", Code = "113"}
                    } 
                },
                new GridData { Name = "Jane Doe", Age = 32, isMale = false },
                new GridData { Name = "Jason Smith", Age = 54, isMale = true },
                new GridData { Name = "Kayli Jayne", Age = 25, isMale = false}
            };


            return data;
        }
    }

windows azure user

create login username with password = 'password'; (on master)
create user username for login username; (on database)
exec sp_addrolemember 'db_owner', 'username'

Longest Increasing Sequence C#

        static public int LongestIncreasingSeq(int[] s) {
            int[] l = new int[s.Length];  // DP table for max length[i]
            int[] p = new int[s.Length];  // DP table for predeccesor[i]
            int max = int.MinValue;

            l[0] = 1;

            for (int i=0; i<s.Length; i++)
                p[i] = -1;

            for (int i = 1; i < s.Length; i++)
            {
                l[i] = 1;
                for (int j = 0; j < i; j++)
                {
                    if (s[j] < s[i] && l[j] + 1 > l[i])
                    {
                        l[i] = l[j] + 1;
                        p[i] = j;
                        if (l[i] > max)
                            max = l[i];
                    }
                }
            }
            return max;
        }

Linear Partition in C#

        static public void partition(int[] s, int n, int k) {
            Console.Write("{");
            Utils.printArray(s);
            Console.WriteLine("}");

            int MAXN = s.Length;
            int MAXK = 3;

            int[,] m = new int[MAXN, MAXK];     // DP table for values.
            int[,] d = new int[MAXN, MAXK];     // DP table for dividers.
            int[] p =  new int[MAXN];           // prefix sums array.
            int cost;

            p[0] = s[0];
            for (int i = 1; i < n; i++) p[i] = p[i - 1] + s[i];

            for (int i = 0; i < n; i++) m[i, 0] = p[i];
            for (int j = 0; j < k; j++) m[0, j] = s[0];
                       
            for (int i = 1; i < n; i++)
                for (int j = 1; j < k; j++)
                {
                    m[i, j] = int.MaxValue;
                    for (int x = 0; x <= (i - 1); x++)
                    {
                        cost = Math.Max(m[x, j - 1], p[i] - p[x]);
                        if (m[i, j] > cost)
                        {
                            m[i, j] = cost;
                            d[i, j] = x + 1;
                        }
                    }
                }

            Console.Write("{");
            reconstruct_particion(s, d, n, k);
            Console.Write("} ");
        }

        private static void reconstruct_particion(int[] s, int[,] d, int n, int k)
        {
            if (k == 1)
            {              
                print_books(s, 0, n);
            }
            else
            {
                reconstruct_particion(s, d, d[n - 1, k - 1], k - 1);
                print_books(s, d[n - 1, k - 1], n);
            }
        }

        private static void print_books(int[] s, int start, int end)
        {
            Console.Write("{");
            for (int i = start; i < end; i++)
                Console.Write(" {0} ", s[i]);
            Console.Write("} ");
        }

There is a known issue in the WCF Services SDK which may soon cause you at least a really annoying message; "this operation is not supported for a relative uri". While it is not fatal and you can ignore it – as a matter of good coding, I tend to get rid of as many warning messages as possible. To fix it, open your machine.config (both x86 and x64 version), and delete the following section:

C:\Windows\Microsoft.NET\Framework\v4.0.30319\Config\machine.config
C:\Windows\Microsoft.NET\Framework64\v4.0.30319\Config\machine.config

<endpoint address="" binding="netTcpRelayBinding" 
 contract="IMetadataExchange" name="sb" />

Presenting Storyboard View Controllers Programmatically

Although the storyboard runtime usually handles transitions between view controllers, you can also trigger segues programmatically from your code. You might do so when setting up the segue in Interface Builder is not possible, such as when using accelerometer events to trigger the transition. There are several options for transitioning to a new view controller:

• If a storyboard file contains an existing segue between the current view controller and the destination view controller (perhaps triggered by some other control in the view controller), you can trigger that segue programmatically using the performSegueWithIdentifier:sender:method of UIViewController.
• If there is no segue between the view controllers but the destination view controller is defined in the storyboard file, first load the view controller programmatically using the instantiateViewControllerWithIdentifier: method of UIStoryboard. Then present the view controller using any of the existing programmatic means, such as by pushing it on a navigation stack.
• If the destination view controller is not in the storyboard file, create it programmatically and present it as described in View Controller Programming Guide for iOS.