要求：如下图，使用线程操作

1、实时显示当前时间

2、输入加数和被加数，自动出现结果

 

分析：两个问题解决的方式一致，使用子线程进行时间操作和加法操作，然后刷新主线程的控件显示结果


	复制代码 代码如下:

	

	using System;

	using System.Threading;

	using System.Windows.Forms;

	namespace WinThread

	{

	public partial class frmMain : Form

	{

	public frmMain()

	{

	InitializeComponent();

	}

	/// <summary>

	/// 初始化

	/// </summary>

	/// <param name="sender"></param>

	/// <param name="e"></param>

	private void frmMain_Load(object sender, EventArgs e)

	{

	// 控件初始化

	this.txtOne.Text = "0";

	this.txtSecond.Text = "0";

	// 显示时间操作

	Thread showTimeThread = new Thread(new ThreadStart(GetTime));

	showTimeThread.IsBackground = true;

	showTimeThread.Start();

	//　加法操作

	Thread addThread = new Thread(new ThreadStart(Add));

	addThread.IsBackground = true;

	addThread.Start();

	}

	#region 显示时间操作

	/// <summary>

	/// 取得实时时间

	/// </summary>

	private void GetTime()

	{

	try

	{

	while (true)

	{

	string currentTime = string.Format("{0}.{1}", DateTime.Now.ToLongTimeString(), DateTime.Now.Millisecond);

	ShowTime(currentTime);

	Application.DoEvents();

	}

	}

	catch (Exception ex)

	{

	Console.WriteLine(ex.Message);

	}

	}

	// 定义显示时间操作委托，用于回调显示时间方法

	delegate void ShowTimeCallBack(string str);

	/// <summary>

	/// 实时显示时间

	/// </summary>

	/// <param name="str"></param>

	private void ShowTime(string str)

	{

	if (this.txtCurrentTime.InvokeRequired)

	{

	ShowTimeCallBack showTimeCallBack = new ShowTimeCallBack(ShowTime);

	this.Invoke(showTimeCallBack, new object[] { str });

	}

	else

	{

	this.txtCurrentTime.Text = str;

	}

	}

	#endregion

	#region 加法操作

	/// <summary>

	/// 加法操作

	/// </summary>

	private void Add()

	{

	try

	{

	while (true)

	{

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

	int j = Convert.ToInt32(this.txtSecond.Text.Trim());

	ShowResult((i + j).ToString());

	Application.DoEvents();

	}

	}

	catch (Exception ex)

	{

	Console.WriteLine(ex.Message);

	}

	}

	// 定义加法操作委托，用于回调加法操作方法

	delegate void ShowResultCallBack(string result);

	/// <summary>

	/// 显示结果

	/// </summary>

	/// <param name="result"></param>

	private void ShowResult(string result)

	{

	if (this.txtResult.InvokeRequired)

	{

	// 写法1

	//ShowResultCallBack showResultCallBack = new ShowResultCallBack(ShowResult);

	//this.Invoke(showResultCallBack, new object[] { result });

	// 写法2

	//使用委托来赋值

	this.txtResult.Invoke(

	//委托方法

	new ShowResultCallBack(ShowResult),

	new object[] { result });

	}

	else

	{

	this.txtResult.Text = result;

	}

	}

	#endregion

	}

	}