WPF ComboBox选定的项目参考一个对象

Question

I'm trying to define a selected item in a combobox. It working fine if I'm just using a String to declare the selected item but not if using an object.

<ComboBox HorizontalAlignment="Left"
  VerticalAlignment="Top" Width="81" materialDesign:HintAssist.Hint="Woche" Margin="10" 
  ItemsSource="{Binding weekSelection}" 
  DisplayMemberPath="name" 
  SelectedItem="{Binding nodeWeek, Mode=TwoWay}"  
SelectedValue="name" />

-

private week _nodeWeek;
public week nodeWeek
{
    get
    {
       return _nodeWeek;
    }
    set
    {
        _nodeWeek = value;
        RaisePropertyChanged("nodeWeek");
    }
}

-

 public class week
 {
    public int val { get; set; }

    public String name { get; set; }
 }

- setting the selected item

this.nodeWeek = new week() { val = times.GetIso8601WeekOfYear(DateTime.Now), name = "KW " + times.GetIso8601WeekOfYear(DateTime.Now).ToString() };

Is there a way to fix that?

Answer 1

The selected item must be always one of the list of your items source. You cannot create new objects and assign them to the SelectedItem . The Combobox simply compares object references not the content.