How to make the first item of a ListView to be selected as default at startup?

Question

There is a ListView in my App and the ListView has a selector. I want to make the first item of this ListView to be selected as default at the very

Answer 1

I have used data binding to solve this,

using the following codebehind:

private List _units;
private Unit _selectedUnit;
public Unit selectedUnit{
  get{
    if (_selectedUnit is null){
      return _units.Count > 0 ? _units[0] : null;
    }else{
      return _selectedUnit;
    }
  }
  set{
    if (_selectedUnit != value){
      _selectedUnit = value;
      OnPropertyChanged("selectedUnit");
    }
  }
}
public event PropertyChangedEventHandler PropertyChanged;
protected virtual void OnPropertyChanged(string propertyName){
  var changed = PropertyChanged;
  if (changed != null){
    PropertyChanged(this, new PropertyChangedEventArgs(propertyName));
  }
}

and XAML