xamarin androidの日付書式を変更する

Question

現在、datepickerはm/d/yyyy形式のテキストビューに日付を設定していますが、dateformatをm/d/yyyyからdd-mm-yyyyに変更したいとします。私はこのtopic.butを見つけた解決策を見つけませんでした。

Main.axml

<TextView 
     android:layout_weight="80" 
     android:id="@+id/dateDisplay" 
     android:layout_width="wrap_content" 
     android:layout_height="wrap_content" 
     android:text="Select Date" /> 
    <Button 
     android:layout_weight="10" 
     android:id="@+id/pickDate" 
     android:layout_width="wrap_content" 
     android:layout_height="wrap_content" 
     android:text="Pick date" /> 

mainactivity.cs

protected override void OnCreate(Bundle bundle) 
     { 
      base.OnCreate(bundle); 

      // Create your application here 
      SetContentView(Resource.Layout.Main); 

      dateDisplay = FindViewById<TextView> (Resource.Id.dateDisplay); 
      pickDate = FindViewById<Button> (Resource.Id.pickDate); 

      // add a click event handler to the button 
      pickDate.Click += delegate { ShowDatePickerDialog(); }; 

      // get the current date 
      //date = DateTime.Today; 

      // display the current date (this method is below) 
      // UpdateDisplay (date); 
     } 

     void ShowDatePickerDialog() 
     { 
      var dialog = new DatePickerFragment(this, DateTime.Now, this); 
      dialog.Show(FragmentManager, null); 
     } 

     public void OnDateSet(DatePicker view, int year, int monthOfYear, int dayOfMonth) 
     { 
      var newDate = new DateTime(year, monthOfYear + 1, dayOfMonth); 
      UpdateDisplay(newDate); 
     } 

     void UpdateDisplay(DateTime selectedDate) 
     { 
      // selectedDate.GetDateTimeFormats('d'); 
      // dateDisplay.Text = selectedDate.GetDateTimeFormats('d').ToString(); 

      dateDisplay.Text = selectedDate.ToString("d"); 
     } 
    } 

DatePickerFragment.cs

public class DatePickerFragment : DialogFragment 
    { 
     private readonly Context context; 
     private DateTime date; 
     private readonly DatePickerDialog.IOnDateSetListener listener; 

     public DatePickerFragment(Context context, DateTime date, DatePickerDialog.IOnDateSetListener listener) 
     { 
      this.context = context; 
      this.date = date; 
      this.listener = listener; 
     } 

     public override Dialog OnCreateDialog(Bundle savedState) 
     { 
      var dialog = new DatePickerDialog(context, listener, date.Year, date.Month - 1, date.Day); 
      return dialog; 
     } 
    } 

Answer 1

UpdateDisplayでこれを試してみてください：

dateDisplay.Text = selectedDate.ToString("dd-MM-yyyy");