How to bind a textbox.Text property in WPF MMVM design - wpf

Question

So I'm trying to learn the MVVM design patter in WPF, I want to do the following:
In external class I've got a ObservableCollection _students that is bound to a listview on the WPF window using MVVM design pattern. The listview shows only the Student's name and Age.
public class Student
{
public string Name { get; set; }
public int Age { get; set; }
public string Course { get; set; }
public DateTime JoiningDate { get; set; }
}
public class ViewModel : INotifyPropertyChanged
{
private ObservableCollection<Student> _students;
protected void NotifyPropertyChanged(string propertyName)
{
if (PropertyChanged!=null)
{
PropertyChanged(this, new PropertyChangedEventArgs(propertyName));
}
}
public ObservableCollection<Student> Students
{
get
{
return _students;
}
set
{
_students = value;
NotifyPropertyChanged("Students");
}
}
All good, but I want to put a TextBox and set it to show the listview's selected item's course property. This means I must
get the listview's selected index (ok)
bind the textbox.Text property to Students[that index].Course
I'm stuck at 2. Any help?

Answer 1

i would solve this by another way.
Take a look at this post
.
Another way would be that your ViewModel contains a Student-property(e.g. SelectedStudent) which is bind to the SelctedItem of the listView. Then you can handel this by
{Binding Path=SelectedStudent.Course}

Answer 2

Assume you bind the listview to a collection of type SampleData like below:
SampleData.cs
public class SampleData
{
public int Id { get; set; }
public string Text { get; set; }
public decimal Value { get; set; }
}
Then you bind the ListView ItemsSource to a collection. WIt does not matter if you bind ItemsSource property to a property on ViewModel or you bind it in code-behind like the code below.
var source = new List<SampleData>();
source.Add(new SampleData() { Id = 1, Text = "AAA" });
source.Add(new SampleData() { Id = 2, Text = "BBB" });
source.Add(new SampleData() { Id = 3, Text = "CCC" });
source.Add(new SampleData() { Id = 4, Text = "DDD" });
source.Add(new SampleData() { Id = 5, Text = "EEE" });
You can bind TextBox's Text property to the SelectedItem directly on the View.
<StackPanel Orientation="Horizontal">
<ListView x:Name="listView1" />
<TextBox Text="{Binding ElementName=listView1, Path=SelectedItem.Text}" />
</StackPanel>