Service/AvaloniaAppApplication/ClientServiceWindow.axaml.cs

using Avalonia;
using Avalonia.Controls;
using Avalonia.Markup.Xaml;
using Avalonia.Media;
using AvaloniaAppApplication.Context;
using AvaloniaAppApplication.DTO;
using AvaloniaAppApplication.Models;
using Microsoft.EntityFrameworkCore;
using MsBox.Avalonia;
using System;
using System.Drawing;
using System.Globalization;
using System.IO;
using System.Linq;
using System.Text;

namespace AvaloniaAppApplication;

public partial class ClientServiceWindow : Window
{
    string time = "";
    string date = "";
    ServiceDTO currentService;
    User19Context dbContext = new User19Context();
    public ClientServiceWindow(ServiceDTO service)
    {
        InitializeComponent();
        currentService = service;
        DataContext = currentService;
        ComboClients.ItemsSource = dbContext.Clients.Select(c => c.Firstname + " " + c.Lastname + " " + c.Patronymic);
    }

    private void TextBox_TextChanged(object? sender, Avalonia.Controls.TextChangedEventArgs e)
    {
        try
        {
            DateTime parsedStartTime;
            string characters = "0123456789.:";
            string processedText = ServiceStartTimeTX.Text ?? string.Empty;

            string[] timeFormats = {
                "HH.mm",
                "H.mm",
                "HH:mm",
                "H:mm"
            };

            if (DateTime.TryParseExact(processedText, timeFormats, CultureInfo.InvariantCulture, DateTimeStyles.None, out parsedStartTime))
            {
                ServiceStartTimeBorder.BorderBrush = new SolidColorBrush(Colors.Green);
                time = parsedStartTime.ToString("HH:mm");
                ManageEndDateTime();
            }
            else
            {
                ServiceStartTimeBorder.BorderBrush = new SolidColorBrush(Colors.Red);
            }
        }
        catch
        {
            return;
        }
    }
    string startDateTimeString;
    public void ManageEndDateTime()
    {
        try
        {
            if (!string.IsNullOrEmpty(date) && !string.IsNullOrEmpty(time) && int.TryParse(DurationInMinutesTN.Text, out int minutes))
            {
                startDateTimeString = date + " " + time;
                string[] formats = { "dd.MM.yy HH:mm", "d.M.yyyy H:mm" };
                if (DateTime.TryParseExact(startDateTimeString, formats, CultureInfo.InvariantCulture, DateTimeStyles.None, out DateTime startDateTime))
                {
                    DateTime endDateTime = startDateTime.AddMinutes(minutes);
                    string endDateTimeString = endDateTime.ToString("dd.MM.yyyy HH.mm", CultureInfo.InvariantCulture); // <20><><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD> CultureInfo
                    ServiceEndTimeTB.Text = endDateTimeString;
                }
                else
                {
                    ServiceEndTimeTB.Text = string.Empty; // <20><><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD> <20><><EFBFBD><EFBFBD> <20><><EFBFBD> <20><><EFBFBD><EFBFBD><EFBFBD><EFBFBD>
                }
            }
        }
        catch (Exception ex)
        {
            return;
        }

    }

    private void Calendar_SelectedDatesChanged(object? sender, Avalonia.Controls.SelectionChangedEventArgs e)
    {
        var selectedDate = (DateTime)((Avalonia.Controls.Calendar)sender).SelectedDate;
        date = selectedDate.ToString("dd.MM.yy");
        ManageEndDateTime();
    }

    // <20><><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD> <20><><EFBFBD><EFBFBD><EFBFBD><EFBFBD> <20><><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD> <20><> <20><><EFBFBD><EFBFBD><EFBFBD><EFBFBD> (<28><><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>)
    private async void Button_Click(object? sender, Avalonia.Interactivity.RoutedEventArgs e)
    {


        try
        {
            StringBuilder errors = new StringBuilder();
            IBrush red = new SolidColorBrush(Colors.Red);
            bool isBorderBrushRed = ServiceStartTimeBorder.BorderBrush is SolidColorBrush solidBrush
    && solidBrush.Color == Colors.Red;
            if (ComboClients.SelectedIndex == -1)
                errors.AppendLine("<22><><EFBFBD><EFBFBD><EFBFBD><EFBFBD> <20><> <20><><EFBFBD><EFBFBD><EFBFBD><EFBFBD>!");
            if (isBorderBrushRed
                || ServiceStartTimeTX.Text == null
                || CalendarControl.SelectedDate == null)
                errors.AppendLine("<22><><EFBFBD><EFBFBD> <20> <20><><EFBFBD><EFBFBD><EFBFBD> <20><><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD> <20><><EFBFBD><EFBFBD><EFBFBD><EFBFBD> <20><><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD> <20><><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>!");

            if (errors != null && errors.Length > 0)
            {
                var msBox = MessageBoxManager.GetMessageBoxStandard("<22><><EFBFBD><EFBFBD><EFBFBD><EFBFBD>!", errors.ToString());
                var rs = msBox.ShowWindowDialogAsync(this);
                return;
            }

            Clientservice newClientService = new Clientservice()
            {
                Clientid = ComboClients.SelectedIndex + 1,
                Starttime = startDateTimeString,
                Serviceid = currentService.Id
            };


            dbContext.Clientservices.Add(newClientService);
            dbContext.SaveChanges();

            var msbox = MessageBoxManager.GetMessageBoxStandard("OK!", "<22><><EFBFBD><EFBFBD><EFBFBD><EFBFBD> <20><> <20><><EFBFBD><EFBFBD><EFBFBD><EFBFBD> <20><><EFBFBD> <20><><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD> <20><><EFBFBD><EFBFBD> <20><><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD> <20><><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>!");
            var res = await msbox.ShowWindowDialogAsync(this);
            Close();
        }
        catch
        {
            return;
        }


    }
}