如何使用计时器在用户指定的时间内提醒我的事件？ [英] How to use timers to remind my events on a time specified by user?

问题描述

完成提醒应用程序并完成所有插入/更新/删除事件，我现在需要的是在添加事件（已保存的表）时弹出用户指定的特定tym上的消息。请帮助我

Done a reminder application & i am done with all insert/update/delete events, what i need now is to popup messages on a particular tym specified by user while adding event(saved table). Please help me

推荐答案

Abdul，我认为您需要做的是创建一个每60秒触发一次的计时器。当它触发时，检查用户的提醒以查看是否有任何结果，然后显示一个包含该信息的对话框。

Abdul, I think that what you need to do is create a timer that fires every 60 seconds. When it fires, check the user's reminders to see if anything is due and then display a dialog box with the information.

这是一些演示计时器的简单代码。

Here is some simple code to demonstrate a timer.

using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using System.Windows.Forms;

namespace TimerExample
{
    public partial class Form1 : Form
    {
        private List<tuple><datetime,>> appointmentList;
        private Timer timer;

        public Form1()
        {
            InitializeComponent();
            lblMessage.Text = "";
        }

        private void btnStart_Click(object sender, EventArgs e)
        {
            // Create a list of test calendar items
            CreateCalendarItems();

            // Create the timer and start it
            CreateTimer();

            lblMessage.Text = "Timer Started";
            SetTime();
        }

        private void CreateCalendarItems()
        {
            appointmentList = new List<tuple><datetime,>>();

            // Add 3 example appointments to the list
            appointmentList.Add(new Tuple<datetime,string>(DateTime.Now.AddMinutes(1), "Budget meeting"));
            appointmentList.Add(new Tuple<datetime,string>(DateTime.Now.AddMinutes(2), "Marketing meeting"));
            appointmentList.Add(new Tuple<datetime,string>(DateTime.Now.AddMinutes(3), "Project Review"));
        }

        private void SetTime()
        {
            txtTime.Text = DateTime.Now.ToLocalTime().ToShortTimeString();
        }

        private void CreateTimer()
        {
            timer = new Timer();
            timer.Interval = 10000;     // 10k milliseconds equal 10 seconds
            timer.Tick += timer_Tick;
            timer.Start();
        }

        private void timer_Tick(object sender, EventArgs e)
        {
            SetTime();

            var appointments = appointmentList.Where(a => a.Item1 <= DateTime.Now);
            if (appointments.Count() > 0)
            { 
                string msg = "The following appointments are due:\n\r\n\r";

                // For this simple demo we are displaying all appointments that are due at or before the current time
                foreach (var item in appointments)
                    msg += String.Format("{0} - {1}\n\r\n\r", item.Item2, item.Item1);

                MessageBox.Show(msg);
            }
        }
    }
}</tuple></tuple>

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