ET9_WebGL_Base/CSharp/App/Modules/Robot/NumValidation.cs

using System;
using System.Globalization;
using System.Windows.Controls;

namespace Robot
{
    public class NumValidation: ValidationRule
    {
        public override ValidationResult Validate(object value, CultureInfo cultureInfo)
        {
            if ((string) value == "")
            {
                return new ValidationResult(true, null);
            }
            try
            {
                int.Parse((string) value);
            }
            catch (Exception e)
            {
                return new ValidationResult(false,
                        string.Format("Illegal characters or {0}", e.Message));
            }

            return new ValidationResult(true, null);
        }
    }
}