ShanXi_SmartControl/GDNXFD.Alert.Config/Validations/AlertRuleIDValidationRule.cs

namespace GDNXFD.Alert.Config.Validations
{
    using Data.Repositories;
    using Data;
    using System;
    using System.Windows.Controls;
    using System.Text.RegularExpressions;

    /// <summary>
    /// Rule for required fields
    /// </summary>
    public class AlertRuleIDValidationRule : ValidationRule
    {
        public static bool Enabled = true;
        /// <summary>
        /// When overridden in a derived class, performs validation checks on a value.
        /// </summary>
        /// <param name="value">The value from the binding target to check.</param>
        /// <param name="cultureInfo">The culture to use in this rule.</param>
        /// <returns>
        /// A <see cref="T:System.Windows.Controls.ValidationResult"/> object.
        /// </returns>
        public override ValidationResult Validate(object value, System.Globalization.CultureInfo cultureInfo)
        {
            if (!Enabled)
                return new ValidationResult(true, null);

            if (value == null || String.IsNullOrWhiteSpace(value.ToString()))
                return new ValidationResult(false, "不能为空！");

            string id = value.ToString();
            if (id.Length < 5)
                return new ValidationResult(false, "至少输入5个字母或数字！");

            if (!IsNatural_Number(id))
                return new ValidationResult(false, "只能输入字母或数字，不能使用特殊字符！");

            AlertRule ar = AlertRuleRepository.GetAlertRuleById(id);
            if (ar != null)
                return new ValidationResult(false, "编码已存在，请重新输入！");


            return new ValidationResult(true, null);
        }

        private bool IsNatural_Number(string strNum)
        {
            Regex notWholePattern = new Regex(@"^[0-9a-zA-Z\$]+$");
            return notWholePattern.IsMatch(strNum, 0);
        }
    }
}