System.Exception {System.ArgumentException} Value does not fall within the expected range
问题 I'm getting this exception whenever i try to access m list picker control in my app. + this {App_name.App} App_name.App + sender {App_name.App} object {App_name.App} - e {System.Windows.ApplicationUnhandledExceptionEventArgs} System.Windows.ApplicationUnhandledExceptionEventArgs + base {System.Windows.ApplicationUnhandledExceptionEventArgs} System.EventArgs {System.Windows.ApplicationUnhandledExceptionEventArgs} + ExceptionObject {System.ArgumentException: Value does not fall within the