WPF_Practice/PacticeSolution/BindingValidationRuleSample/Model/Student.cs

using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Linq;
using System.Text;
using System.Threading.Tasks;

namespace BindingValidationRuleSample.Model
{
    public class Student : INotifyPropertyChanged
    {
        private string _name;
        private string _age;
        private string _phoneNumber;

        public event PropertyChangedEventHandler? PropertyChanged;

        public Student(string name, string age, string number)
        {
            
        }

        public Student() : this("Name", "20", "123-456-7890")
        {
            
        }

        public string Name
        { 
            get { return _name; } 
            set
            {
                _name = value;
                OnPropertyChanged(nameof(this.Name));
            } 
        }

        public string Age
        {
            get { return _age; }
            set
            {
                _age = value;
                OnPropertyChanged(nameof(this.Age));
            }
        }

        public string PhoneNumber
        {
            get { return _phoneNumber; }
            set
            {
                _phoneNumber = value;
                OnPropertyChanged(nameof(this.PhoneNumber));
            }
        }

        private void OnPropertyChanged(string propertyName)
        {
            if (this.PropertyChanged == null)
                return;

            this.PropertyChanged(this, new PropertyChangedEventArgs(propertyName));
        }
    }
}