How to implemente mask behavior in xamarin

Question

Rajanikant Hawaldar · Accepted Answer

https://www.c-sharpcorner.com/article/how-to-mask-phone-number-like-xxx-xxx-xxxx-in-xamarin-forms-using-behaviors/ https://www.c-sharpcorner.com/article/input-validation-in-xamarin-forms-behaviors/  public   class  MaskedText : Behavior    {        private   string  _mask =  "" ;        public   string  Mask       {            get  => _mask;            set            {               _mask = value;               SetPositions();           }       }        protected   override   void  OnAttachedTo(Entry entry)       {           entry.TextChanged += OnEntryTextChanged;            base .OnAttachedTo(entry);       }        protected   override   void  OnDetachingFrom(Entry entry)       {            entry.TextChanged -= OnEntryTextChanged;             base .OnDetachingFrom(entry);       }       IDictionary int ,  char > _positions;        void  SetPositions()       {            if  ( string .IsNullOrEmpty(Mask))           {               _positions =  null ;                return ;           }           var list =  new  Dictionary int ,  char >();            for  (var i = 0; i               if  (Mask[i] !=  'X' )                   list.Add(i, Mask[i]);              _positions = list;       }        private   void  OnEntryTextChanged( object  sender, TextChangedEventArgs args)       {           var entry = sender  as  Entry;           var text = entry.Text;            if  ( string .IsNullOrWhiteSpace(text) || _positions ==  null )                return ;               if  (text.Length > _mask.Length)           {               entry.Text = text.Remove(text.Length - 1);                return ;           }            foreach  (var position  in  _positions)                if  (text.Length >= position.Key + 1)               {                   var value = position.Value.ToString();                    if  (text.Substring(position.Key, 1) != value)                       text = text.Insert(position.Key, value);               }               if  (entry.Text != text)               entry.Text = text;       }   }   UI Code: ContentPage   xmlns = "http://xamarin.com/schemas/2014/forms"                  xmlns:x = "http://schemas.microsoft.com/winfx/2009/xaml"                  xmlns:behavior = "clr-namespace:Enterprise.Behaviors"                  x:Class = "Enterprise.View.Features.Main.MainView" >         ContentPage.Content >             StackLayout   VerticalOptions = "Center" >                 Entry   Keyboard = "Numeric" >                     Entry.Behaviors >                         behavior:MaskedText   Mask = "(XXX) XXX-XXX"   />                     Entry.Behaviors >                 Entry >             StackLayout >         ContentPage.Content >    ContentPage >

Shrishail Pattar · Answer

Thanks you for helping