WPF Datagrid Override SelectedItem

See more:

WPF

DataGrid

Binding

Hi,

i am using a datagrid to edit an observablecollection of persons. Therefore i also have a dictionary of persons (same type). So when i write the lastname in a cell i want that after
edit ends (on enter) the software searches in the dictionary for an existing entry and replaces the Person in my collection. Therefore i hang into the celleditending Event and execute following code:

private void dgPersons_CellEditEnding(object sender, DataGridCellEditEndingEventArgs e)
{
  if (e.Column.DisplayIndex == 1) //Name Column
  {
    string Name = ((TextBox)e.EditingElement).Text.ToLower();
    var dict = App.Dict.Where(p=> p.Name.ToLower() == name.ToLower()).ToList();
    if (dict.Count > 0)
      dgPersons.SelectedItem = dict[0];
    else
    {
      MessageBox.Show("Cannot find Event: " + name, "Not Found");
      e.Cancel = true;
      ((TextBox)e.EditingElement).Text = "";
    }
  }
}

If i do it like that nothing happens, if i add the Person to my observablelist the Person appears in the datagrid but also the entered before.
Can anyone help me out with this Problem?

Kind Regards
Manu