Hi If you following MVVM then its better you bind SelectedItem /SelectedValue of DataGrid to get the SelectedItem instead of SelectionChanged event.I hope this will help.
<Grid>
<Grid.ColumnDefinitions>
<ColumnDefinition Width="*"/>
<ColumnDefinition Width="*"/>
</Grid.ColumnDefinitions>
<ListBox ItemsSource="{Binding Students}" DisplayMemberPath="Name" SelectedItem="{Binding SelectedStudent, Mode=TwoWay}"/>
<StackPanel Grid.Column="1">
<TextBlock Text="{Binding SelectedStudent.FamilyName}"/>
<TextBlock Text="{Binding SelectedStudent.PhoneNumber}"/>
</StackPanel>
</Grid>
public partial class MainWindow : Window
{
public MainWindow()
{
InitializeComponent();
DataContext = new ViewModel();
}
}
public class ViewModel : INotifyPropertyChanged
{
public ViewModel()
{
Students = new ObservableCollection<Student>();
Students.Add(new Student()
{
Name = "James",
FamilyName = "mangol",
PhoneNumber = "01234 111111"
});
Students.Add(new Student()
{
Name = "Bob",
FamilyName = "angol",
PhoneNumber = "01234 222222"
});
Students.Add(new Student()
{
Name = "Emma",
FamilyName = "pangol",
PhoneNumber = "01234 333333"
});
}
public ObservableCollection<Student> Students { get; set; }
private Student selectedStudent;
public Student SelectedStudent
{
get { return selectedStudent; }
set { selectedStudent = value; Notify("SelectedStudent"); }
}
public event PropertyChangedEventHandler PropertyChanged;
private void Notify(string propName)
{
if (PropertyChanged != null)
PropertyChanged(this, new PropertyChangedEventArgs(propName));
}
}
public class Student:INotifyPropertyChanged
{
private string name;
public string Name
{
get { return name; }
set { name = value; Notify("Name"); }
}
private string familyname;
public string FamilyName
{
get { return familyname; }
set { familyname = value;Notify("FamilyName"); }
}
private string phonenumber;
public string PhoneNumber
{
get { return phonenumber; }
set { phonenumber = value; Notify("PhoneNumber"); }
}
public event PropertyChangedEventHandler PropertyChanged;
private void Notify(string propName)
{
if (PropertyChanged != null)
PropertyChanged(this, new PropertyChangedEventArgs(propName));
}
}
The above example demonstrates how to use SelectedItem using Binding.This is not the exact solution of your problem but this will give you idea how to use SelectedItem.I have shown for ListBox it works same for DataGrid.
