WPF_Practice/PacticeSolution/BindingValidationRuleSample/Validation/AgeRangeException.cs

using System;
using System.Collections.Generic;
using System.Globalization;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using System.Windows.Controls;

namespace BindingValidationRuleSample.Validation
{
    public class AgeRangeException : ValidationRule
    {
        public int MinAge { get; set; } = 0;
        public int MaxAge { get; set; } = 150;

        public override ValidationResult Validate(object value, CultureInfo cultureInfo)
        {
            int age = 0;
            if (!int.TryParse(value.ToString(), out age))
                return new ValidationResult(false, "Wrong value.");

            if (age >= this.MinAge && age <= this.MaxAge)
                return new ValidationResult(true, null);
            else
                return new ValidationResult(false, $"Valid age range is {this.MinAge}~{this.MaxAge}");
        }
    }
}