WPF simple Binding Problem

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Hello everyone
I am not expert in neither binding nor WPF.

I have problem in this very simple program.
I have 3 text boxes:
1- First Name
2- Surname
3- Full Name

When I change First Name or Surname, Full Name textbox does not update

this is my program. please have a look at it:

WPF:

XML

<Window x:Class="myTutorial_WPF_Binding_Example.MainWindow"
        xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
        xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
        xmlns:src="clr-namespace:WPF_Binding_Example"
        Title="MainWindow" Height="385" Width="563">
    <Window.Resources>
        <src:Person x:Key="myDataSourceObject" PersonFirstName="AAA" PersonSurName="Davis"/>
    </Window.Resources>
    <Grid>
        <TextBlock Margin="10,16,0,0" Text="First Name: " VerticalAlignment="Top" HorizontalAlignment="Left" />
        <TextBlock Margin="18,46,0,0" Text="SurName: " VerticalAlignment="Top" HorizontalAlignment="Left" />
        <TextBlock Margin="14,80,0,0" Text="Full Name: " VerticalAlignment="Top" MaxWidth="Infinity" HorizontalAlignment="Left" />
        <TextBox Margin="79,13,79,0"
                 Text="{Binding Source={StaticResource myDataSourceObject}, Path=PersonFirstName}"
                 VerticalAlignment="Top" />
        <TextBox Margin="79,43,79,0"
                 Text="{Binding Source={StaticResource myDataSourceObject}, Path=PersonSurName}"
                 VerticalAlignment="Top" />
        <TextBox Margin="79,77,79,0"
                 Text="{Binding Source={StaticResource myDataSourceObject}, Path=PersonFullName}"
                 VerticalAlignment="Top" />
    </Grid>
</Window>

and this is my class:

C#

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
namespace WPF_Binding_Example
{
    public class Person
    {
        private string _personFirstName;
        public string PersonFirstName
        {
            set
            {
                _personFirstName = value;
                PersonFullName = PersonFirstName + " " + PersonSurName;
            }
            get { return _personFirstName; }
        }
        private string _personSurName;
        public string PersonSurName
        {
            set
            {
                _personSurName = value;
                PersonFullName = PersonFirstName + " " + PersonSurName;
            }
            get { return _personSurName; }
        }
        public string PersonFullName { set; get; }
    }
}

Posted 3-Aug-11 19:14pm

aasser

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Abhinav S · Accepted Answer · 2011-08-03T19:46:00

Solution 1

You need to implement INotifyPropertyChanged in your class.
Read shout this here[^].
Also see here[^].

Posted 3-Aug-11 19:46pm

Abhinav S

Comments

[no name] 4-Aug-11 2:46am

Thanks so much
still something is a question for me.
in this example of MSDN:

public string PhoneNumber
{
get { return this.phoneNumberValue; }

set
{
if (value != this.phoneNumberValue)
{
this.phoneNumberValue = value;
NotifyPropertyChanged("PhoneNumber");
}
}
}

there is a problem. if i rename the name of property one day, since no change will happen inside the quotation, the program will face a run-time error. it may happen also when obfuscation.

Abhinav S 4-Aug-11 3:05am

Yes you need to make sure you change the property name inside "". Find and replace might help - but there is no direct fix for that.