Binding a property inside observerList in wpf - wpf

Question

I am writing an application in C#, WPF, XAML using MVVM patterm.
After many examples that I founded online the data that I try to Bind to the UI is not shown in the screen.
My architecture is : In the MainViewModel I have an ObserverList from type family,
in Family class I have an ObserverList from type Child,
in Child class I have Name.
How to Bind the Child Name in to TextBlock?
Some examples that I founded:
https://msdn.microsoft.com/en-us/library/aa970558%28v=vs.110%29.aspxv
<Window x:Class="DataTemplates.MainWindow"
xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
xmlns:local="clr-namespace:DataTemplates"
Title="MainWindow"
Height="350"
Width="525">
<Window.Resources>
<DataTemplate x:Key="MyDataTemplate"
DataType="local:MyData">
<Grid>
<Grid.RowDefinitions>
<RowDefinition Height="Auto" />
</Grid.RowDefinitions>
<Grid.ColumnDefinitions>
<ColumnDefinition Width="*" />
<ColumnDefinition Width="*" />
<ColumnDefinition Width="*" />
<ColumnDefinition Width="*" />
<ColumnDefinition Width="*" />
</Grid.ColumnDefinitions>
<TextBlock Grid.Column="0"
Text="First Name: " />
<TextBlock Grid.Column="1"
Text="{Binding Path=FirstName}" />
<TextBlock Grid.Column="2"
Text="Last Name: " />
<TextBlock Grid.Column="3"
Text="{Binding Path=LastName}" />
<CheckBox Grid.Column="4"
Content="Is Lecturer?"
IsEnabled="False"
IsChecked="{Binding Path=IsLecturer}" />
</Grid>
</DataTemplate>
</Window.Resources>
<StackPanel>
<ListBox ItemsSource="{Binding}"
ItemTemplate="{StaticResource MyDataTemplate}"
HorizontalContentAlignment="Stretch" />
<Button Content="Add"
Click="Button_Click" />
</StackPanel>
</Window>
and the code Behind
using System.Collections.ObjectModel;
using System.Windows;
namespace CollectionDemo
{
/// <summary>
/// Interaction logic for MainWindow.xaml
/// </summary>
public partial class MainWindow : Window
{
private ObservableCollection<MyData> _myCollection =
new ObservableCollection<MyData>();
public MainWindow()
{
InitializeComponent();
DataContext = _myCollection;
_myCollection.Add(
new MyData
{
FirstName = "Arik",
LastName = "Poznanski",
IsLecturer = true
});
_myCollection.Add(
new MyData
{
FirstName = "John",
LastName = "Smith",
IsLecturer = false
});
}
private int counter = 0;
private void Button_Click(object sender, RoutedEventArgs e)
{
++counter;
_myCollection.Add(
new MyData()
{
FirstName = "item " + counter,
LastName = "item " + counter,
IsLecturer = counter % 3 == 0
});
}
}
}
class my data form the example
public class MyData
{
public string User { get; set; }
public string Password { get; set; }
}

Answer 1

I made a custom example which matches your scenario, take a look at this.
MainWindow.xaml
<Window x:Class="SO.MainWindow"
xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
Title="MainWindow" Height="350" Width="525">
<Grid>
<TextBlock Height="30" Text="{Binding Parent.Child.SampleText}" HorizontalAlignment="Center"/>
</Grid>
</Window>
MainWindow.xaml.cs
public partial class MainWindow : Window
{
public MainWindow()
{
InitializeComponent();
MainViewModel obj = new MainViewModel();
this.DataContext = obj;
}
}
MainViewModel.cs
public class MainViewModel
{
private ParentModel _Parent = new ParentModel();
public ParentModel Parent
{
get { return _Parent; }
set { _Parent = value; }
}
public MainViewModel() //Data Load in Constructor
{
ChildModel child = new ChildModel();
child.SampleText = "Hi, I am Child!";
Parent.Child = child;
}
}
ParentModel.cs
public class ParentModel
{
private ChildModel _Child = new ChildModel();
public ChildModel Child
{
get { return _Child; }
set { _Child = value; }
}
}
ChildModel.cs
public class ChildModel
{
private string _SampleText ;
public string SampleText
{
get { return _SampleText; }
set { _SampleText = value; }
}
}
Corrections in your eg:
Your View and Code behind is perfect.
You didn't add properties in model class which is to be binded in UI.
class MyData
{
//public string User { get; set; }
//public string Password { get; set; }
public string FirstName { get; set; }
public string LastName { get; set; }
public bool IsLecturer { get; set; }
}