bllvalidation.cs

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

namespace BLL
{
    public partial class Bill : IDataErrorInfo, INotifyPropertyChanged
    {
        private int id;
        private int contractId;
        private DateTime dateIssued;
        private DateTime? paymentDeadline;
        private decimal? discount;
        private bool paid;

        public int Id
        {
            get { return id; }
            set
            {
                id = value;
                if (PropertyChanged != null)
                    PropertyChanged(this, new PropertyChangedEventArgs("Id"));
            }
        }
        public int ContractId
        {
            get { return contractId; }
            set
            {
                contractId = value;
                if (PropertyChanged != null)
                    PropertyChanged(this, new PropertyChangedEventArgs("ContractId"));
            }
        }

        public DateTime DateIssued
        {
            get { return dateIssued; }
            set
            {
                dateIssued = value;
                if (PropertyChanged != null)
                    PropertyChanged(this, new PropertyChangedEventArgs("DateIssued"));
            }
        }

        public DateTime? PaymentDeadline
        {
            get { return paymentDeadline; }
            set
            {
                paymentDeadline = value;
                if (PropertyChanged != null)
                    PropertyChanged(this, new PropertyChangedEventArgs("PaymentDeadline"));
            }
        }

        public decimal? Discount
        {
            get { return discount; }
            set
            {
                discount = value;
                if (PropertyChanged != null)
                    PropertyChanged(this, new PropertyChangedEventArgs("Discount"));
            }
        }

        public bool Paid
        {
            get { return paid; }
            set
            {
                paid = value;
                if (PropertyChanged != null)
                    PropertyChanged(this, new PropertyChangedEventArgs("Paid"));
            }
        }



        #region IDataErrorInfo Members

        public string Error
        {
            get
            {
                var sb = new StringBuilder();
                if (!string.IsNullOrWhiteSpace(this["ContractId"]))
                {
                    sb.AppendLine(this["ContractId"]);
                }
                if (!string.IsNullOrWhiteSpace(this["DateIssued"]))
                {
                    sb.AppendLine(this["DateIssued"]);
                }
                if (!string.IsNullOrWhiteSpace(this["Paid"]))
                {
                    sb.AppendLine(this["Paid"]);
                }

                return sb.Length > 0 ? sb.ToString() : String.Empty;
            }
        }



        public string this[string columnName]
        {
            get
            {
                switch (columnName)
                {
                    case "ContractId":
                        return ContractId == 0 ? "Nije odabran ugovor!" : String.Empty;
                    case "DateIssued":
                        return DateIssued == null ? "Nije odabran datum izdanja!" : String.Empty;
                    case "Paid":
                        return paid == null ? "Nije odabran status!" : String.Empty;
                    default:
                        return String.Empty;
                }
            }
        }

        #endregion

        #region INotifyPropertyChanged

        public event PropertyChangedEventHandler PropertyChanged;

        #endregion

    }
}