C# Timer遅延処理 – テックメモ

インクリメンタルサーチ系を作るとき、だいたいTextChangedにそのまま処理をくっつけてしまうのだけど、量が多いとカクついてしまうので、TextChangedが連続していた場合Timerで遅延処理をつけたほうがいい。

using System;
using System.Windows.Forms;

namespace WindowsFormsApp2
{
    public partial class Form1 : Form
    {
        public Form1()
        {
            InitializeComponent();
            this.Text = "0";

            var delayExecute = new DelayExecute2();
            delayExecute.Execute += (s, e) => CutTree();

            textBox1.TextChanged += (s, e) =>
            {
                delayExecute.ReserveExecute();
            };

            button1.Click += (s, e) =>
            {
                this.Text = "0";
                textBox1.Text = "";
            };
        }

        private void CutTree()
        {
            int i = Convert.ToInt32(this.Text);
            Invoke(new Action(() => {
                this.Text = (i + 1).ToString();
            }));
        }
    }

    /* Timer

    System.Windows.Forms.Timer：WindowsForm向け。同一スレッド
    System.Threading.Timer：軽量、別スレッド
    System.Timers.Timer：高精度、別スレッド

    */

    class DelayExecute
    {
        public event EventHandler Execute;
        public int DelayTime = 500;

        System.Threading.Timer Timer;

        public DelayExecute()
        {
            Timer = new System.Threading.Timer(x => {
                Execute(this, EventArgs.Empty);
            });
        }
        public void ReserveExecute()
        {
            Timer.Change(DelayTime, System.Threading.Timeout.Infinite);
            //Change(遅延時間,間隔)Timeout.Infiniteで無効化
        }
    }

    class DelayExecute2
    {
        public event EventHandler Execute;

        System.Timers.Timer Timer;

        public DelayExecute2()
        {
            Timer = new System.Timers.Timer();
            Timer.AutoReset = false;
            Timer.Elapsed += (s, e) => Execute(this, EventArgs.Empty); // Interval後にElapsedの初回起動
            Timer.Interval = 500;
        }
        public void ReserveExecute()
        {
            Timer.Start();
            Timer.Interval = 500;
        }
    }
}

using System;

using System.Windows.Forms;

namespace WindowsFormsApp2

{

public partial class Form1 : Form

{

public Form1()

{

InitializeComponent();

this.Text = "0";

var delayExecute = new DelayExecute2();

delayExecute.Execute += (s, e) => CutTree();

textBox1.TextChanged += (s, e) =>

{

delayExecute.ReserveExecute();

};

button1.Click += (s, e) =>

{

this.Text = "0";

textBox1.Text = "";

};

}

private void CutTree()

{

int i = Convert.ToInt32(this.Text);

Invoke(new Action(() => {

this.Text = (i + 1).ToString();

}));

}

/* Timer

System.Windows.Forms.Timer：WindowsForm向け。同一スレッド

System.Threading.Timer：軽量、別スレッド

System.Timers.Timer：高精度、別スレッド

class DelayExecute

{

public event EventHandler Execute;

public int DelayTime = 500;

System.Threading.Timer Timer;

public DelayExecute()

{

Timer = new System.Threading.Timer(x => {

Execute(this, EventArgs.Empty);

});

}

public void ReserveExecute()

{

Timer.Change(DelayTime, System.Threading.Timeout.Infinite);

//Change(遅延時間,間隔)Timeout.Infiniteで無効化

}

class DelayExecute2

{

public event EventHandler Execute;

System.Timers.Timer Timer;

public DelayExecute2()

{

Timer = new System.Timers.Timer();

Timer.AutoReset = false;

Timer.Elapsed += (s, e) => Execute(this, EventArgs.Empty); // Interval後にElapsedの初回起動

Timer.Interval = 500;

}

public void ReserveExecute()

{

Timer.Start();

Timer.Interval = 500;

}