mdk-01.01-N11/N11_1/ViewModels/VMTeacherAddViewModel.cs

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text.RegularExpressions;
using MsBox.Avalonia;
using MsBox.Avalonia.Enums;
using N11_1.Models;
using ReactiveUI;
namespace N11_1.ViewModels
{
    public class VMTeacherAddViewModel : ReactiveObject
    {
        string surname = "";
        string name = "";
        string patronomic = "";
        string mail = "";
        string phone = "";
        string workExpensive = "";
        DateTime dateofbirthd = DateTime.Now;
        bool gender = false;
        List<string> lesson = MainWindowViewModel.connection.TbLessons.Select(tb => tb.Name).ToList();
        List<string> selectedLesson = new List<string>();

        public string Surname { get => surname; set => surname = value; }
        public string Name { get => name; set => name = value; }
        public string Patronomic { get => patronomic; set => patronomic = value; }
        public bool GenderG { get => gender; set => gender = value; }
        public bool GenderM { get => !gender; set => gender = !value; }
        public string Mail { get => mail; set => mail = value; }
        public string Phone { get => phone; set => phone = value; }
        public string WorkExpensive { get => workExpensive; set => workExpensive = value; } 
        public DateTimeOffset Dateofbirthd { get => new DateTimeOffset(dateofbirthd); set => dateofbirthd = value.DateTime; }
        public List<string> Lesson { get => lesson; set => lesson = value; }
        public List<string> SelectedLesson { get => selectedLesson; set => this.RaiseAndSetIfChanged(ref selectedLesson, value); }
        public string SelectedValueLesson
        {
            get => null;
            set
            {
                //ïðîâåðêà íà íàëè÷èå ýòîãî ýêçåìïëÿðà
                bool flag = SelectedLesson.Where(tb => tb == value).Count() == 0;
                if (flag)
                {
                    selectedLesson.Add(value);
                    SelectedLesson = new List<string>(selectedLesson);
                }
            }
        }
        public string DeleteValueLesson
        {
            get => null;
            set
            {
                del(value);
            }
        }               

        private async void del(string value)
        {
            switch (await MessageBoxManager
            .GetMessageBoxStandard("Ïîäòâåðæäåíèå óäàëåíèÿ", "Âû äåéñòâèòåëüíî õîòèòå óäàëèòü äàííûé ýëåìåíò?\n(" + value + ")",
                ButtonEnum.YesNo).ShowAsync())
            {
                case ButtonResult.Yes:
                    {
                        if (selectedLesson.Count == 1)
                            selectedLesson = new List<string>();
                        else
                            selectedLesson.Remove(value);
                        SelectedLesson = new List<string>(selectedLesson);
                        break;
                    }
                default:
                    {
                        break;
                    }
            }
        }

        public string add()
        {
            string result = "";
            Regex checkName = new Regex("^[A-ÿ,.'-]+$");//ïðîâåðêà èìåí
            Regex checkPhone = new Regex(@"^(\+?7|8)\d{10}$");//ïðîâåðêà òåëåôîíà
            Regex checkEmail = new Regex(@"^\S+@\S+\.\S+$");//ïðîâåðêà ïî÷òû
            Regex checkExpensive = new Regex(@"^\d+([\.\,]\d+)?$");//ïðîâåðêà ñòàæà

            if (string.IsNullOrWhiteSpace(Surname) || !checkName.IsMatch(Surname))
            {
                result += "\nÏîëå \"Ôàìèëèÿ\" ââåäåííî íåêîððåêòíî";
            }
            if (string.IsNullOrWhiteSpace(Name) || !checkName.IsMatch(Name))
            {
                result += "\nÏîëå \"Èìÿ\" ââåäåííî íåêîððåêòíî";
            }
            if (string.IsNullOrWhiteSpace(Patronomic) || !checkName.IsMatch(Patronomic))
            {
                result += "\nÏîëå \"Îò÷åñòâî\" ââåäåííî íåêîððåêòíî";
            }
            if (Dateofbirthd > DateTime.Now)
            {
                result += "\nÂûáðàííàÿ äàòà íåêîððåêòíà";
            }
            if (string.IsNullOrWhiteSpace(Mail) || !checkEmail.IsMatch(Mail))
            {
                result += "\nÏîëå \"Ïî÷òà\" ââåäåííî íåêîððåêòíî";
            }
            if (string.IsNullOrWhiteSpace(Phone) || !checkPhone.IsMatch(Phone))
            {
                result += "\nÏîëå \"Òåëåôîí\" ââåäåííî íåêîððåêòíî (+79999999999)";
            }
            if (string.IsNullOrWhiteSpace(WorkExpensive) || !checkExpensive.IsMatch(WorkExpensive))
            {
                result += "\nÏîëå \"Ñòàæ ðàáîòû\" ââåäåííî íåêîððåêòíî";
            }
            if (SelectedLesson.Count == 0)
            {
                result += "\nÂû íå âûáðàëè íè îäíîãî ïðåäìåòà";
            }

            return result;
        }
    }
}