C# 4. 三种定时器实测数据

三种定时器实测精度都不是太高。

在.NET中有三种计时器：
1、System.Windows.Forms命名空间下的Timer控件，它直接继承自Componet。Timer控件只有绑定了Tick事件和设置Enabled=True后才会自动计时，停止计时可以用Stop()方法控制，通过Stop()停止之后，如果想重新计时，可以用Start()方法来启动计时器。Timer控件和它所在的Form属于同一个线程。

似乎只能重复计时。

2、System.Timers命名空间下的Timer类。System.Timers.Timer类：定义一个System.Timers.Timer对象，然后绑定Elapsed事件，通过Start()方法来启动计时，通过Stop()方法或者Enable=false停止计时。

AutoReset属性设置是否重复计时（设置为false只执行一次，设置为true可以多次执行）。

Elapsed事件绑定相当于另开了一个线程，也就是说在Elapsed绑定的事件里不能访问其它线程里的控件（需要定义委托，通过Invoke调用委托访问其它线程里面的控件）。
3、System.Threading.Timer类。定义该类时，通过构造函数进行初始化。

1. System.Windows.Forms.Timer

Windows 窗体计时器组件是单线程的，且限制为55毫秒的准确度。如果需要具有更高准确性的多线程计时器，请使用 Timer 命名空间中的类 System.Timers 。
微软网站说明
https://docs.microsoft.com/zh-cn/dotnet/api/system.threading.timer?view=net-5.0
System.Threading.Timer 是一个简单的轻型计时器，它使用回调方法，并由线程池线程提供服务。不建议与 Windows 窗体一起使用，因为它的回调不会在用户界面线程上发生。 System.Windows.Forms.Timer 是与 Windows 窗体一起使用的更好选择。对于基于服务器的计时器功能，您可以考虑使用 System.Timers.Timer ，它会引发事件并具有其他功能。

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 timerdemo
{
    public partial class Form1 : Form
    {
        //1
        private System.Windows.Forms.Timer timer1 = null;
        public Form1()
        {
            InitializeComponent();
        }
        private void Form1_Load(object sender, EventArgs e)
        {
            //if(timer1 == null)
            {
                //创建定时器
                timer1 = new System.Windows.Forms.Timer();
               //设置定时器属性
                timer1.Tick += new EventHandler(HandleTimer1);
            }
        }
        private void buttonStart1_Click(object sender, EventArgs e)
        {
            timer1.Interval = 2000;
            timer1.Start();
            textBoxTest.Text += DateTime.Now.ToString("yyyy-MM-dd HH:mm:ss:fff") + " start 2srn";
        }
        public void HandleTimer1(Object myObject, EventArgs myEventArgs)
        {
            textBoxTest.Text += DateTime.Now.ToString("yyyy-MM-dd HH:mm:ss:fffrn");
        }

        private void buttonStop1_Click(object sender, EventArgs e)
        {
            textBoxTest.Text += DateTime.Now.ToString("yyyy-MM-dd HH:mm:ss:fff") + " stoprn";
            timer1.Stop();
        }

        private void buttonClr_Click(object sender, EventArgs e)
        {
            textBoxTest.Text = "";
        }

        private void buttonStart1_2_Click(object sender, EventArgs e)
        {
            timer1.Interval = 50;
            timer1.Start();
            textBoxTest.Text += DateTime.Now.ToString("yyyy-MM-dd HH:mm:ss:fff") + " start 50msrn";
        }
    }
}

2. System.Timers.Timer

    private void Form1_Load(object sender, EventArgs e)
        {

            //System.Timers.Timer实例化
            timer2 = new System.Timers.Timer();
            timer2.Interval = 2000;
            // Hook up the Elapsed event for the timer. 
            timer2.Elapsed += OnTimedEvent;	//Elapsed事件绑定相当于另开了一个线程
            // Have the timer fire repeated events (true is the default)
            timer2.AutoReset = true;
            // Start the timer
            //timer2.Enabled = true;
        }
        private System.Timers.Timer timer2 = null;
        private void OnTimedEvent(Object source, System.Timers.ElapsedEventArgs e)
        {
//Elapsed绑定的事件里不能访问其它线程里的控件（需要定义委托，通过Invoke调用委托访问其它线程里面的控件）
            this.Invoke((EventHandler)(delegate
            {
                textBoxTest.Text += DateTime.Now.ToString("yyyy-MM-dd HH:mm:ss:fff") + "rn";
            }));
        }
        private void buttonStart2_Click(object sender, EventArgs e)
        {
            timer2.Interval = 2000;
            // Hook up the Elapsed event for the timer. 
            //timer2.Elapsed += OnTimedEvent;
            // Have the timer fire repeated events (true is the default)
            //timer2.AutoReset = true;
            // Start the timer
            timer2.Enabled = true;
            this.Invoke((EventHandler)(delegate
            {
                textBoxTest.Text += DateTime.Now.ToString("yyyy-MM-dd HH:mm:ss:fff") + "start 2srn";
            }));
        }

        private void buttonStop2_Click(object sender, EventArgs e)
        {
            timer2.Enabled = false;
            this.Invoke((EventHandler)(delegate
            {
                textBoxTest.Text += DateTime.Now.ToString("yyyy-MM-dd HH:mm:ss:fff") + "stoprn";
            }));
        }

        private void buttonStart2_50ms_Click(object sender, EventArgs e)
        {
            timer2.Interval = 50;
            // Hook up the Elapsed event for the timer. 
            //timer2.Elapsed += OnTimedEvent;
            // Have the timer fire repeated events (true is the default)
            //timer2.AutoReset = true;
            // Start the timer
            timer2.Enabled = true;
            this.Invoke((EventHandler)(delegate
            {
                textBoxTest.Text += DateTime.Now.ToString("yyyy-MM-dd HH:mm:ss:fff") + "start 50msrn";
            }));
        }

3.System.Threading.Timer

     private void Form1_Load(object sender, EventArgs e)
        {
            //System.Windows.Forms.Timer实例化
            //if(timer1 == null)
            {
                //创建定时器
                timer1 = new System.Windows.Forms.Timer();
               //设置定时器属性
                timer1.Tick += new EventHandler(HandleTimer1);
            }

            //System.Timers.Timer实例化
            timer2 = new System.Timers.Timer();
            timer2.Interval = 2000;
            // Hook up the Elapsed event for the timer. 
            timer2.Elapsed += OnTimedEvent;
            // Have the timer fire repeated events (true is the default)
            timer2.AutoReset = false;
            // Start the timer
            //timer2.Enabled = true;

            //System.Threading.timer
            //            timer3 = new System.Threading.Timer(Timer3CallBack, null, 5000, 1000);        //窗体启动后隔5s后每隔1s执行Timer3CallBack
            timer3 = new System.Threading.Timer(Timer3CallBack, null, Timeout.Infinite, 1000);          //窗体启动后不执行
        }

//定义Timer类
        System.Threading.Timer timer3;
        private void Timer3CallBack(Object stateInfo)
        {
            this.Invoke((EventHandler)(delegate
            {
                textBoxTest.Text += DateTime.Now.ToString("yyyy-MM-dd HH:mm:ss:fff") + "rn";
            }));
        }

        private void buttonStart3_Click(object sender, EventArgs e)
        {
            timer3.Change(0, 2000);
        }

        private void buttonStart3_50ms_Click(object sender, EventArgs e)
        {
            timer3.Change(0, 50);
        }

        private void buttonStop3_Click(object sender, EventArgs e)
        {
            timer3.Change(Timeout.Infinite, 1000);
        }

4. 全部代码

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

namespace timerdemo
{
    public partial class Form1 : Form
    {
        //1
        private System.Windows.Forms.Timer timer1 = null;
        public Form1()
        {
            InitializeComponent();
        }
        private void Form1_Load(object sender, EventArgs e)
        {
            //System.Windows.Forms.Timer实例化
            //if(timer1 == null)
            {
                //创建定时器
                timer1 = new System.Windows.Forms.Timer();
               //设置定时器属性
                timer1.Tick += new EventHandler(HandleTimer1);
            }

            //System.Timers.Timer实例化
            timer2 = new System.Timers.Timer();
            timer2.Interval = 2000;
            // Hook up the Elapsed event for the timer. 
            timer2.Elapsed += OnTimedEvent;
            // Have the timer fire repeated events (true is the default)
            timer2.AutoReset = false;
            // Start the timer
            //timer2.Enabled = true;

            //System.Threading.timer
            //            timer3 = new System.Threading.Timer(Timer3CallBack, null, 5000, 1000);        //窗体启动后隔5s后每隔1s执行Timer3CallBack
            timer3 = new System.Threading.Timer(Timer3CallBack, null, Timeout.Infinite, 1000);          //窗体启动后不执行
        }
        private void buttonStart1_Click(object sender, EventArgs e)
        {
            timer1.Interval = 2000;
            timer1.Start();
            textBoxTest.Text += DateTime.Now.ToString("yyyy-MM-dd HH:mm:ss:fff") + " start 2srn";
        }
        public void HandleTimer1(Object myObject, EventArgs myEventArgs)
        {
            textBoxTest.Text += DateTime.Now.ToString("yyyy-MM-dd HH:mm:ss:fffrn");
        }

        private void buttonStop1_Click(object sender, EventArgs e)
        {
            textBoxTest.Text += DateTime.Now.ToString("yyyy-MM-dd HH:mm:ss:fff") + " stoprn";
            timer1.Stop();
        }

        private void buttonClr_Click(object sender, EventArgs e)
        {
            textBoxTest.Text = "";
        }

        private void buttonStart1_2_Click(object sender, EventArgs e)
        {
            timer1.Interval = 50;
            timer1.Start();
            textBoxTest.Text += DateTime.Now.ToString("yyyy-MM-dd HH:mm:ss:fff") + " start 50msrn";
        }

        private System.Timers.Timer timer2 = null;
        private void OnTimedEvent(Object source, System.Timers.ElapsedEventArgs e)
        {
            this.Invoke((EventHandler)(delegate
            {
                textBoxTest.Text += DateTime.Now.ToString("yyyy-MM-dd HH:mm:ss:fff") + "rn";
            }));
        }
        private void buttonStart2_Click(object sender, EventArgs e)
        {
            timer2.Interval = 2000;
            // Hook up the Elapsed event for the timer. 
            //timer2.Elapsed += OnTimedEvent;
            // Have the timer fire repeated events (true is the default)
            //timer2.AutoReset = true;
            // Start the timer
            timer2.Enabled = true;
            this.Invoke((EventHandler)(delegate
            {
                textBoxTest.Text += DateTime.Now.ToString("yyyy-MM-dd HH:mm:ss:fff") + "start 2srn";
            }));
        }

        private void buttonStop2_Click(object sender, EventArgs e)
        {
            timer2.Enabled = false;
            this.Invoke((EventHandler)(delegate
            {
                textBoxTest.Text += DateTime.Now.ToString("yyyy-MM-dd HH:mm:ss:fff") + "stoprn";
            }));
        }

        private void buttonStart2_50ms_Click(object sender, EventArgs e)
        {
            timer2.Interval = 50;
            // Hook up the Elapsed event for the timer. 
            //timer2.Elapsed += OnTimedEvent;
            // Have the timer fire repeated events (true is the default)
            //timer2.AutoReset = true;
            // Start the timer
            timer2.Enabled = true;
            this.Invoke((EventHandler)(delegate
            {
                textBoxTest.Text += DateTime.Now.ToString("yyyy-MM-dd HH:mm:ss:fff") + "start 50msrn";
            }));
        }

        //3
        //定义Timer类
        System.Threading.Timer timer3;
        private void Timer3CallBack(Object stateInfo)
        {
            this.Invoke((EventHandler)(delegate
            {
                textBoxTest.Text += DateTime.Now.ToString("yyyy-MM-dd HH:mm:ss:fff") + "rn";
            }));
        }

        private void buttonStart3_Click(object sender, EventArgs e)
        {
            timer3.Change(0, 2000);
        }

        private void buttonStart3_50ms_Click(object sender, EventArgs e)
        {
            timer3.Change(0, 50);
        }

        private void buttonStop3_Click(object sender, EventArgs e)
        {
            timer3.Change(Timeout.Infinite, 1000);
        }
    }
}

C# 4. 三种定时器实测数据

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