CODEWITHSUNDEEP
c#wpfcomboboxenumsselectedvalue
Carlos
Carlos

Reputation: 105

C# - WPF ComboBox SelectedValue from Enum

I have a ComboBox in XAML:

<ComboBox x:Name="Form1Combobox" Width="150" IsSynchronizedWithCurrentItem="True" SelectedValue="{Binding Dept}" ItemsSource="{Binding Source={StaticResource ResourceKey=Depts}}"/>

My static resource is using an ObjectDataProvider to populate the ComboBox with values from an enum:

public enum Department
{
    Leadership,
    Maintenance,
    Salaried,
    Commission
}

I have an ObservableCollection of employees, where I set their Dept property to something (say, Dept = Department.Leadership). The employee class uses INotifyPropertyChange, for other things including a name. The ComboBox populates correctly, but it's initial value isn't being set.

My question is, how can I set the SelectedValue of the ComboBox to the appropriate property of the employee?

EDIT: This is my observable collection (a snippet).

ObservableCollection<Employee> emps = new ObservableCollection<Employee>
{
    new Employee{Name = "Exam Pell", Title = "Manager", Phone = "(801) 555-2677", Email = "[email protected]", isActive = true, Dept = Department.Commission}, 
};

This is my static resource:

<ObjectDataProvider x:Key="Depts" MethodName="GetValues" ObjectType="{x:Type sys:Enum}">
    <ObjectDataProvider.MethodParameters>
        <x:Type TypeName="en:department+Department"></x:Type>
    </ObjectDataProvider.MethodParameters>
</ObjectDataProvider>

I have actually noticed that whenever I attempt to set SelectedValue or SelectedItem, the combobox turns red (I have a DataGridComboBoxColumn that is also tied to this, but has an ItemsSource). Also, I have a ListBox that also shows the department - however, this one displays the correctly, but doesn't update even when I change the ComboBox selection for any employee.

Upvotes: 2

Views: 4400

Answers (1)

Nikhil Agrawal
Nikhil Agrawal

Reputation: 48568

Instead of setting SelectedValue set SelectedItem.

To set SelectedValue you need to have set DisplayMemberPath and ValueMemberPath. In your case since its an Enum you can't set them.

So set SelectedItem like this

<ComboBox x:Name="Form1Combobox" 
          Width="150" 
          IsSynchronizedWithCurrentItem="True" 
          SelectedItem="{Binding Dept}" 
          ItemsSource="{Binding Source={StaticResource ResourceKey=Depts}}"/>

Upvotes: 3

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