Question

I have created a UserControl which has several properties. When I add the user control in to WPF application it will display those properties in the Visual Studio Property Window.

But I have a property called UserList which is a List<String> type. That property is also displayed in the Property Window with hint text “(collection)” and button with three dots. When I click on that button it will show a dialog box, which can add some values to the UserList variable. But that part of the window is not enabled.

So how can I enable that part. Is there any special things that I have to do for my UserList property?

This is how my property definition looks:

    private List<String> dataSources = new List<String>();
    [Description("Users"), Category("Time Line")]
    public List<string> UserList
    {
        get { return dataSources; }
        set { dataSources = value; }
    }

Answer 1

I have found a solution, but I think this method does not work on Lists. But any way, Collection can be converted into a List.

private Collection<String> dataSources = new Collection<String>();
[Description("Data Sources"), Category("Time Line")]
[DesignerSerializationVisibility(DesignerSerializationVisibility.Content)]
public Collection<DataSourceModel> DataSources
{    
    get { return dataSources; }
    set { dataSources = value; }
}