動作環境

Windows 8.1 Pro (64bit)
Microsoft Visual Studio 2017 Community
Sublime Text 2

処理概要

Buttonを押した時に1秒インターバルのタイマーを起動する
- DispatcherTimer 使用
  - MSDN
タイマーの処理ごとに経過秒数をDateTime.Subtract()で取得する
- MSDN

code

MainWindow.xaml

<Window x:Class="_171110_t1515_dispatcherTimer.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:_171110_t1515_dispatcherTimer"
        mc:Ignorable="d"
        Title="MainWindow" Height="350" Width="525">
    <Grid>
        <StackPanel>
            <TextBlock Name="T_time" Height="50" Text=""/>
            <Button Width="120" Height="30" Content="Start" Click="Button_Click"/>
        </StackPanel>
    </Grid>
</Window>

MainWindow.xaml.cs

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using System.Windows;
using System.Windows.Controls;
using System.Windows.Data;
using System.Windows.Documents;
using System.Windows.Input;
using System.Windows.Media;
using System.Windows.Media.Imaging;
using System.Windows.Navigation;
using System.Windows.Shapes;
//以下を追加 (DispatcherTimerのため)
using System.Windows.Threading;

namespace _171110_t1515_dispatcherTimer
{
    /// <summary>
    /// MainWindow.xaml の相互作用ロジック
    /// </summary>
    public partial class MainWindow : Window
    {
        DispatcherTimer myTimer;
        DateTime startTime;

        public MainWindow()
        {
            InitializeComponent();

            myTimer = new DispatcherTimer(DispatcherPriority.Normal);
            myTimer.Interval = new TimeSpan(0, 0, 1);
            myTimer.Tick += myTimer_Tick;
        }

        void myTimer_Tick(object sender, EventArgs e)
        {
            int elapsed_sec = DateTime.Now.Subtract(startTime).Seconds;
            T_time.Text = elapsed_sec.ToString() + " sec";
        }

        private void Button_Click(object sender, RoutedEventArgs e)
        {
            startTime = DateTime.Now;
            myTimer.Start();
        }
    }
}

実行

ボタン押下後の様子。

関連