Adding value in checklist box from another window

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3.00/5 (3 votes)

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VS2010

I have a WPF application with two tab. When I am adding the values from the text box to the checked list box, the values get added properly. But when I add the items in the checked list box from another window, the previous value is overiden and only the new value appears and main problem is that many instance of window opening as many item add in ckeck list box.
Thanks
I am also giving my source code..
Plz tell me what I need to do:
MainWindow.xaml

<pre lang="xml"><Window x:Class="WpfApplication9.MainWindow"
        xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
        xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
        Title="MainWindow" Height="536" Width="853">
    <Grid>
        <TabControl Height="260" HorizontalAlignment="Left" Margin="41,57,0,0" Name="tabControl1" VerticalAlignment="Top" Width="731">
            <TabItem Header="old" Name="tabItem1">
                <Grid>
                    <Grid Height="180" Margin="61,15,333,32" Width="327">
                        <Grid.ColumnDefinitions>
                            <ColumnDefinition Width="10*" />
                            <ColumnDefinition Width="317*" />
                        </Grid.ColumnDefinitions>
                        <Grid.RowDefinitions>
                            <RowDefinition Height="84*" />
                            <RowDefinition Height="81*" />
                        </Grid.RowDefinitions>
                        <TextBox Grid.ColumnSpan="2" Grid.Row="1" Height="23" HorizontalAlignment="Left" Margin="8,60,0,0" Name="textBox3" VerticalAlignment="Top" Width="209" />
                        <Button Content="add prev" Grid.Column="1" Height="28" HorizontalAlignment="Left" Margin="215,6,0,0" Name="btn_AssgnLesson" VerticalAlignment="Top" Width="96" Click="btn_AssgnLesson_Click" />
                        <Button Content="add here" Grid.Column="1" Grid.Row="1" Height="28" HorizontalAlignment="Left" Margin="215,57,0,0" Name="btn_ChgLesson" VerticalAlignment="Top" Width="96" Click="btn_ChgLesson_Click" />
                        <ListBox ItemsSource="{Binding Path=tripList}"  Grid.Column="1" Grid.RowSpan="2" Height="128" HorizontalAlignment="Left" Margin="13,6,0,0" Name="listLesson" Selector.IsSelected="{Binding IsChecked, ElementName=checkBox, Mode=TwoWay}" VerticalAlignment="Top" Width="194">
                            <ListBox.ItemTemplate>
                                <DataTemplate>
                                    <StackPanel Orientation="Horizontal">
                                        <CheckBox Margin="2" VerticalAlignment="Center" IsChecked="{Binding IsVisited}" />
                                        <TextBlock Margin="2" Foreground="Black" FontSize="14" Text="{Binding LessonName}" />
                                    </StackPanel>
                                </DataTemplate>
                            </ListBox.ItemTemplate>
                        </ListBox>
                    </Grid>
                </Grid>
            </TabItem>
            <TabItem Header="new">
                <Grid>
                    <Grid.ColumnDefinitions>
                        <ColumnDefinition>
                        </ColumnDefinition>
                        <ColumnDefinition>
                        </ColumnDefinition>
                    </Grid.ColumnDefinitions>
                </Grid>
                <!--
                <GroupBox Header="groupBox1" Height="148" Name="groupBox1" Width="277">
                    <ListBox Height="74" Name="listLesson" Width="241" DataContext="{Binding}" IsSelected="{Binding IsChecked, ElementName=checkBox, Mode=TwoWay}">
                        <ListBox.ItemTemplate>
                            <DataTemplate>
                                <StackPanel Orientation="Horizontal">
                                    <CheckBox Margin="2" VerticalAlignment="Center" IsChecked="{Binding IsVisited}" />
                                    <TextBlock Margin="2" Foreground="Black" FontSize="14" Text="{Binding LessonName}" />
                                </StackPanel>
                            </DataTemplate>
                        </ListBox.ItemTemplate>
                    </ListBox>
                </GroupBox>
                -->
            </TabItem>
        </TabControl>
    </Grid>
</Window

>

MainWindow.cs

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Windows;
using System.Windows.Controls;
using System.Windows.Data;
using System.Windows.Documents;
using System.Windows.Input;
using System.Windows.Media;
using System.Windows.Media.Imaging;
using System.Windows.Navigation;
using System.Windows.Shapes;

namespace WpfApplication9
{ 
   
    /// <summary>
    /// Interaction logic for MainWindow.xaml
    /// </summary>
    public partial class MainWindow : Window
    {
      
        List<TripInfo> tripList = new List<TripInfo>();
        public MainWindow()
        {
            InitializeComponent();
            DataContext = this;
        }
    private void button1_Click(object sender, RoutedEventArgs e)
    {
        tripList.Add(new TripInfo(false, textBox3.Text));
        listLesson.Items.Refresh();

    }
   
        public class TripInfo

         {

        public TripInfo(bool isVisited, string cityName)

          {

             IsVisited = isVisited;

             LessonName = cityName;

         }


         public Boolean IsVisited

          { get; set; }


         public String LessonName

        { get; set; }
        }



        private void btn_AssgnLesson_Click(object sender, RoutedEventArgs e)
        {
            Window1 wd1 = new Window1();
            wd1.ShowDialog();
           
        }

        private void btn_ChgLesson_Click(object sender, RoutedEventArgs e)
        {
            tripList.Add(new TripInfo(false, textBox3.Text));
            listLesson.Items.Refresh();
        }

 
    }
}

Window1.xaml

<Window x:Class="WpfApplication9.Window1"
        xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
        xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
        Title="Window1" Height="300" Width="300">
    <Grid>
        <Button Content="add lesson" Height="23" HorizontalAlignment="Left" Margin="66,77,0,0" Name="button1" VerticalAlignment="Top" Width="75" Click="button1_Click" />
        <TextBox Height="23" HorizontalAlignment="Left" Margin="52,36,0,0" Name="textBox1" VerticalAlignment="Top" Width="120" />
    </Grid>
</Window>

Window1.xaml.cs

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Windows;
using System.Windows.Controls;
using System.Windows.Data;
using System.Windows.Documents;
using System.Windows.Input;
using System.Windows.Media;
using System.Windows.Media.Imaging;
using System.Windows.Shapes;

namespace WpfApplication9
{
     
  
    /// <summary>
    /// Interaction logic for Window1.xaml
    /// </summary>
    public partial class Window1 : Window
    {
        public TripInfo tripInfo;
        MainWindow objmain = new MainWindow();
        List<TripInfo> tripList = new List<TripInfo>();
        public Window1()
        {
           
             InitializeComponent();
            objmain.listLesson.ItemsSource=tripList;
            InitializeComponent();
        }

        private void button1_Click(object sender, RoutedEventArgs e)
        {


         
            //logic to add value in check list box

        
            
           objmain.Show();
           tripList.Add(new TripInfo(false, textBox1.Text));
           objmain.listLesson.Items.Refresh();
        }
       
        public class TripInfo

         {

        public TripInfo(bool isVisited, string cityName)

          {

             IsVisited = isVisited;

             LessonName = cityName;

         }


         public Boolean IsVisited

          { get; set; }


         public String LessonName

        { get; set; }
        }


    }
}

Posted 5-Apr-11 19:05pm

vishal_h

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Shahin Khorshidnia · Accepted Answer · 2011-04-05T20:39:00

Hello,

Don't make instance just use a property like LessonForAdding

Foe example :

have this:

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Windows;
using System.Windows.Controls;
using System.Windows.Data;
using System.Windows.Documents;
using System.Windows.Input;
using System.Windows.Media;
using System.Windows.Media.Imaging;
using System.Windows.Shapes;
namespace WpfApplication9
{

    /// <summary>
    /// Interaction logic for Window1.xaml
    /// </summary>
    public partial class Window1 : Window
    {
        public string LessonForAdding { get; set; }
        public TripInfo tripInfo;
        MainWindow objmain = new MainWindow();
        List<TripInfo> tripList = new List<TripInfo>();
        public Window1()
        {
            InitializeComponent();
            objmain.listLesson.ItemsSource = tripList;
            InitializeComponent();
        }
        private void button1_Click(object sender, RoutedEventArgs e)
        {

            //logic to add value in check list box

            //      objmain.Show();
            //     tripList.Add(new TripInfo(false, textBox1.Text));
            //    objmain.listLesson.Items.Refresh();
            LessonForAdding = textBox1.Text;
            this.Close();
        }
        public class TripInfo
        {
            public TripInfo(bool isVisited, string cityName)
            {
                IsVisited = isVisited;
                LessonName = cityName;
            }

            public Boolean IsVisited
            { get; set; }

            public String LessonName
            { get; set; }
        }

    }
}

And this:

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Windows;
using System.Windows.Controls;
using System.Windows.Data;
using System.Windows.Documents;
using System.Windows.Input;
using System.Windows.Media;
using System.Windows.Media.Imaging;
using System.Windows.Navigation;
using System.Windows.Shapes;
namespace WpfApplication9
{
    /// <summary>
    /// Interaction logic for MainWindow.xaml
    /// </summary>
    public partial class MainWindow : Window
    {
        List<TripInfo> tripList = new List<TripInfo>();
        public MainWindow()
        {
            InitializeComponent();
            DataContext = this;
        }
        private void button1_Click(object sender, RoutedEventArgs e)
        {
            tripList.Add(new TripInfo(false, textBox3.Text));
            listLesson.Items.Refresh();
        }
        public class TripInfo
        {
            public TripInfo(bool isVisited, string cityName)
            {
                IsVisited = isVisited;
                LessonName = cityName;
            }

            public Boolean IsVisited
            { get; set; }

            public String LessonName
            { get; set; }
        }

        private void btn_AssgnLesson_Click(object sender, RoutedEventArgs e)
        {
            Window1 wd1 = new Window1();
            wd1.ShowDialog();
            TripInfo item = new TripInfo(false, wd1.LessonForAdding);
            listLesson.Items.Add(item);
//  objmain.Show();
//  tripList.Add(new TripInfo(false, textBox1.Text));
//  this.listLesson.Items.Refresh();            
        }
        private void btn_ChgLesson_Click(object sender, RoutedEventArgs e)
        {
            tripList.Add(new TripInfo(false, textBox3.Text));
            listLesson.Items.Refresh();
        }

    }
}