using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using System.Windows;
using System.Windows.Input;
using System.Windows.Threading;

namespace QuanLyKho.ViewModel
{
    public class MainViewModel : BaseViewModel
    {
        private string _lbl;
        public string lbl { get => _lbl; set { _lbl = value; OnPropertyChanged(); } }
        public void Timer()
        {
            DispatcherTimer timer = new DispatcherTimer();
            timer.Interval = TimeSpan.FromSeconds(1);
            timer.Tick += timer_Tick;
            timer.Start();
        }
        public void timer_Tick(object sender, EventArgs e)
        {
            lbl = DateTime.Now.ToLongTimeString();


        }




        public bool Isloaded = false;
        public ICommand LoadedWindowCommand { get; set; }

        // mọi thứ xử lý sẽ nằm trong này
        public MainViewModel()
        {
          
            Timer();
        }
    }
}
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<Window x:Class="QuanLyKho.MainWindow"
        xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
        xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
        xmlns:d="http://schemas.microsoft.com/expression/blend/2008"
        xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006"
        xmlns:local="clr-namespace:QuanLyKho"
        WindowStartupLocation="CenterScreen"
        mc:Ignorable="d"
        xmlns:i="http://schemas.microsoft.com/expression/2010/interactivity"
        
        Name="mainWindow"
        xmlns:materialDesign="http://materialdesigninxaml.net/winfx/xaml/themes"
         xmlns:uc="clr-namespace:QuanLyKho.UserControlThuThiem"
        TextElement.Foreground="{DynamicResource MaterialDesignBody}"
        ResizeMode="NoResize"
        WindowStyle="None"
     TextElement.FontWeight="Regular"
     TextElement.FontSize="13"
     TextOptions.TextFormattingMode="Ideal"
     TextOptions.TextRenderingMode="Auto"
     Background="{DynamicResource MaterialDesignPaper}"
     FontFamily="{DynamicResource MaterialDesignFont}"
        DataContext="{StaticResource MainVM}"
        Title="Timer" FontSize="15" 
        Height="600" Width="650">

    <i:Interaction.Triggers>
        <i:EventTrigger EventName="Loaded">
            <i:InvokeCommandAction Command="{Binding LoadedWindowCommand}"/>
        </i:EventTrigger>
    </i:Interaction.Triggers>

    <Grid>

        <Grid.RowDefinitions>
            <RowDefinition Height="auto"></RowDefinition>
            <RowDefinition></RowDefinition>
        </Grid.RowDefinitions>
        <Grid Grid.Row="0">
            <uc:ControlBarUC Tag="{Binding Title, ElementName=mainWindow}"></uc:ControlBarUC>
        </Grid>

        <Grid Grid.Row="1">
            <Grid.RowDefinitions>
           <RowDefinition Height="auto"></RowDefinition>
            </Grid.RowDefinitions>

        </Grid>
   
            <!--Timer-->
            <Grid Grid.Row="1">

            <TextBlock x:Name="lblTime" 
                        TextWrapping="Wrap" FontSize="48" HorizontalAlignment="Center" VerticalAlignment="Center"
                        Text="{Binding lbl, UpdateSourceTrigger=PropertyChanged}">

            </TextBlock>
        </Grid>


    </Grid>
</Window>
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