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程序在執行中暫停一段時間

張吉惟2年前15瀏覽0評論

程序在執行中暫停一段時間?

在線程中,如果要暫停一定的時間,可以使用Thread的Sleep方法,讓線程暫停。在微軟新的win8API中,已經用Task來實現原來用線程實現的許多功能,同樣,Task也有Delay方法,讓程序暫停一定的時間。

以下程序利用System.Threading.Timer讓程序每隔間隔的時間執行回調方法:

using System;

using System.Collections.Generic;

using System.Text;

using System.Threading;

namespace TimerApp{

class Program{

static void Main(string[] args){

Console.WriteLine("***** Working with Timer type *****/n");

// Create the delegate for the Timer type.

TimerCallback timeCB = new TimerCallback(PrintTime);

// Establish timer settings.

Timer t = new Timer(

timeCB, // The TimerCallback delegate type.

"Hello From Main", // Any info to pass into the called method (null for no info).

5000, // Amount of time to wait before Starting.

Timeout.Infinite); //一秒鐘調用一次 Interval of time between calls (in milliseconds).

Console.WriteLine("Hit key to terminate...");

Console.ReadLine();}

static void PrintTime(object state){

Console.WriteLine("Time is: {0}, Param is: {1}",

DateTime.Now.ToLongTimeString(), state.ToString());}

如果把時間間隔1000改成 Timeout.Infinite,這樣回調方法PrintTime只會在1秒之后調用一次。

除了Threading下有個Timer類之外,.net中還有另一個Timer,就是System.Timer名稱空間下的Timer。此Timer的用法和Threading下的Timer不太相同。

System.Timers.Timer t2 = new System.Timers.Timer(100);

t2.Elapsed += t2_Elapsed;

//t1.AutoReset = false;

t2.Enabled = true;}}

void t2_Elapsed(object sender, System.Timers.ElapsedEventArgs e){}

其中AutoReset屬性的含義是是否在每次時間間隔到了都觸發Elapsed事件還是只觸發一次(t1.AutoReset = false;)。

解決此類問題的一個小例子(實現在窗體上相隔指定時間顯示字幕)

//創建StopNtime類

using System;

using System.Collections.Generic;

using System.Linq;

using System.Text;

using System.Threading;

namespace 程序運行暫停器{

class StopNtime{

public StopNtime(){

System.Windows.Forms.Control.CheckForIllegalCrossThreadCalls = false;//,跨線程調用控件必加上去 }

private int stopTime = 0;//暫停的時間

ThreadStart myStart;

Thread TheStop;

public readonly object MylockWord = new object();

public void stopWay(int stopTime){

this.stopTime = stopTime;

myStart = new ThreadStart(this .ToStop );

TheStop = new Thread(myStart );

TheStop.Start();

private void ToStop(){

lock (MyLockWord){

Thread.Sleep(this .stopTime );

Thread.CurrentThread.Abort();

//主窗體代碼

using System;

using System.Collections.Generic;

using System.ComponentModel;

using System.Data;

using System.Drawing;

using System.Linq;

using System.Text;

using System.Windows.Forms;

using System.Threading ;

using System.Collections;

namespace 程序運行暫停器{

public partial class Form1 : Form{

public Form1(){

InitializeComponent();}

private void Form1_Load(object sender, EventArgs e){

label1.Text = "";

Thread f = new Thread(f1 );

f.Start();}

string MyWord = "問題:1+1=? ...\n答案是:2 ...";

private void f1(){

StopNtime mmm = new StopNtime();

foreach (char m in MyWord){

lock (mmm.MyLockWord ){

label1.Text += m.ToString();

mmm.stopWay(300);

//運行結果