Present value from listbox in a textbox that keep update.

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Hi to all!!

I´m mired in my WPF app.
I need to create a .cs class (Configuration.cs) with three properties (Name,PropA and PropB).
In my UI I want to show all the Names in the Configuration instances that I had in a listBox.

When I select an Item in the listBox, the properties PropA and PropB must shown in two different TextBoxes. Furthermore, I want these textBoxes are editable and when the user changes the value and submit the changes with a button, the appropriate Configuration instance is updated.

How can I do this? How must my Configuartion.cs class be? How I have to define the properties in this class?

Thanks for all.

Posted 4-Sep-13 6:08am

torin86

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2 solutions

Solution 1

I didn't understand the first part about properties but about the second part to change the value of a list box you can use:

C#

int a = ListBoxName.SelectedIndex;

to get the index of the selected item then you should get the items in an array by:

C#

string[] array;
int i = 0;
int b = ListBoxName.Items.Count;
while (i < b)
{
     array[i] = ListBoxName.Items[i];
     i++;
}

then edit your considered item by a text box as entered value:

C#

array[a] = textBox.Text;

at last the edition is completed and you should get back the new list box value from array:

C#

i = 0;
while (i > b);
{
ListBoxName.Items.Add(array[i]);
i++;
}

and it's done.
i hope so to help you about first part but you should explain more.
Doostl

Posted 4-Sep-13 7:28am

i.fakhari

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basavrajmswami · Accepted Answer · 2013-09-04T08:08:00

here is your configurations class..

C#

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;

namespace Dispacher
{
   public class Configurations
    {
        public String Name { get; set; }

        public string PropA { get; set; }

        public string PropB { get; set; }
    }



    
}

Here is your ViewModel

C#

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Collections.ObjectModel;
using System.Windows.Input;
using System.Windows;
using System.Diagnostics;
using System.ComponentModel;

namespace Dispacher
{
   public class DisplayViewModel
    {

        public ObservableCollection<configurations> SelectedPeople { get; private set; }
        public List<configurations> AvailablePeople { get; private set; }
        public DelegateCommand Submitcommand { get; private set; }

        public string OutPut { get; set; }

               
        public DisplayViewModel()
        {
            // Constructor which will generate data for view
            AvailablePeople = new List<configurations> {
                new Configurations { Name="Basavraj", PropA = "John", PropB = "Doe" }, 
                new Configurations {Name="Mallikarjun", PropA = "Michael", PropB = "Jones" }, 
                new Configurations {Name="Swami", PropA = "Jane", PropB = "Smith" }, };

            Submitcommand = new DelegateCommand(modifiedData);
                
        }

        //here you can get modified data object
       //Put breakpoint to see modified data
        private void modifiedData()
        {
            Predicate<configurations> pred = item => item.PropA != "John" || item.PropA != "Michael" || item.PropA != "Jane";
            //modified data
            var modifieddata = AvailablePeople.Find(pred);

            if (modifieddata != null)
                OutPut = "PropA :=" + modifieddata.PropA + ",PropB :=" + modifieddata.PropB;
        }

        public class DelegateCommand : ICommand
        {

            private Action _executeMethod;

            public DelegateCommand(Action executeMethod)
            {

                _executeMethod = executeMethod;

            }

            public bool CanExecute(object parameter)
            {

                return true;

            }

            public event EventHandler CanExecuteChanged;

            public void Execute(object parameter)
            {

                _executeMethod.Invoke();

            }

        }
    }
}
</configurations></configurations></configurations></configurations>

here is your view

HTML

<window x:class="Dispacher.Window1" xmlns:x="#unknown">
        xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
        xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
        xmlns:Sample="clr-namespace:Dispacher"
        Title="Window1" Height="500" Width="500">

    <window.resources>
        <objectdataprovider>
            x:Key="Viewmodel"     
            ObjectType="{x:Type Sample:DisplayViewModel}"/>
    </objectdataprovider></window.resources>
    <grid>

        <dockpanel datacontext="{StaticResource Viewmodel}">
            <listbox name="list" dockpanel.dock="Left" width="130">
                      ItemsSource="{Binding AvailablePeople}"       
                      DisplayMemberPath="Name" 
                      SelectedValuePath="ListBox"/>
            <textbox text="{Binding ElementName=list, Path=SelectedItem.PropA}" height="50" width="100" />
            <textbox text="{Binding ElementName=list, Path=SelectedItem.PropB}" height="50" width="100" />
            <button width="20" height="50">
                    Command="{Binding Submitcommand}"  
                    CommandParameter="{Binding AvailablePeople, ElementName=list}"
                    Content=">>"/>


        </button></listbox></dockpanel>
    </grid>
</window>

Please mark accepted if got solution