#region 方式2-1 启动线程(带输入参数的)
private void btn1_Click(object sender, EventArgs e)
{
MyObject obj = new MyObject(1, 2);//或者使用全局变量代替obj
Thread thread = new Thread(obj.FunctionName);
thread.Start();
}
public class MyObject
{
public int a1, b1;
public MyObject(int a, int b)
{
a1 = a;
b1 = b;
}
public void FunctionName()
{
MessageBox.Show("a:" + a1 + ",b:" + b1);
}
}
#endregion
#region 方式2-2 启动线程(带输入参数的)
private void btn2_Click(object sender, EventArgs e)
{
//这个Thread类的构造方法的定义如下：
Thread thread = new Thread(myStaticParamThreadMethod);
thread.Start("通过委托的参数传值");
}
public static void myStaticParamThreadMethod(Object obj)
{
MessageBox.Show(obj.ToString());
}
//[ComVisibleAttribute(false)]
//public delegate void ParameterizedThreadStart(Object obj);
//public Thread(ParameterizedThreadStart start);
#endregion
#region 方式3 线程池技术
RegisteredWaitHandle RW;
private void btn3_Click(object sender, EventArgs e)
{
//ThreadPool.QueueUserWorkItem((objState) =>
//{
// //do something.. //from the thread pool.
//}, null);
RW = ThreadPool.RegisterWaitForSingleObject(wait, new WaitOrTimerCallback(test), state, 1000, false);
wait.Set();
}
AutoResetEvent wait = new AutoResetEvent(false);
object state = new object();
int count = 0;
/// <summary>
/// 会定时反复调用
/// </summary>
private void test(object state, bool timedOut)
{
SetText(DateTime.Now.ToString());
count++;
if (count > 5) RW.Unregister(wait);//执行5次后，退出
}
/// <summary>
/// 调用UI线程,修改界面数据
/// </summary>
public void SetText(string argText)
{
if (lblResult.InvokeRequired)
{
lblResult.Invoke(new SetTextDelegateMethod(SetText), new[] { argText });
}
else
lblResult.Text = argText;
}
public delegate void SetTextDelegateMethod(string argText);
#endregion
#region 方式4 使用BackgroundWorker
//支持：报告进度、支持完成回调、取消任务、暂停任务等
private BackgroundWorker Worker;
private void btn4_Click(object sender, EventArgs e)
{
Worker = new BackgroundWorker();
Worker.WorkerReportsProgress = true;
Worker.WorkerSupportsCancellation = true;
Worker.DoWork += worker_DoWork;
Worker.ProgressChanged += worker_ProgressChanged;
Worker.RunWorkerCompleted += worker_RunWorkerCompleted;
Worker.RunWorkerAsync();
}
/// <summary>
/// 异步执行完毕，回到UI线程
/// </summary>
void worker_RunWorkerCompleted(object sender, RunWorkerCompletedEventArgs e)
{
if (e.Cancelled) lblResult.Text = "取消成功！";
else lblResult.Text = "执行完成！";
////测试捕获异常
//if (e.Error != null && !string.IsNullOrEmpty(e.Error.Message)) lblResult.Text = e.Error.Message;
//借助AsyncOperation.Post(SendOrPostCallback d, object arg)，
//在winform下使用这个函数,使得由SendOrPostCallback定义被封送回UI线程
}
private void btn4Abort_Click(object sender, EventArgs e)
{
Worker.CancelAsync();
}
void worker_DoWork(object sender, DoWorkEventArgs e)
{
BackgroundWorker _worker = sender as BackgroundWorker;
for (int i = 1; i < 101; i++)
{
_worker.ReportProgress(i, "执行到第" + i + "个");
Thread.Sleep(100);
//此时在非UI线程中执行代码，执行下行代码会出错
//lblResult.Text = "aaa"; //线程间操作无效: 从不是创建控件“lblResult”的线程访问它。
//这里判断一下是否用户要求取消后台进行，并可以尽早退出
if (_worker.CancellationPending)
{
e.Cancel = true;
return;
}
////测试捕获异常
//if (i == 35) throw new Exception("在执行到i=" + i + "时候出错！");
}
}
void worker_ProgressChanged(object sender, ProgressChangedEventArgs e)
{
this.lblResult.Text = e.ProgressPercentage.ToString() + " " + e.UserState;
}
#endregion
namespace WinFormsApp_CreateAThread
{
partial class Form1
{
/// <summary>
/// 必需的设计器变量。
/// </summary>
private System.ComponentModel.IContainer components = null;
/// <summary>
/// 清理所有正在使用的资源。
/// </summary>
/// <param name="disposing">如果应释放托管资源，为 true；否则为 false。</param>
protected override void Dispose(bool disposing)
{
if (disposing && (components != null))
{
components.Dispose();
}
base.Dispose(disposing);
}
#region Windows 窗体设计器生成的代码
/// <summary>
/// 设计器支持所需的方法 - 不要
/// 使用代码编辑器修改此方法的内容。
/// </summary>
private void InitializeComponent()
{
this.btn1 = new System.Windows.Forms.Button();
this.btn2 = new System.Windows.Forms.Button();
this.btn3 = new System.Windows.Forms.Button();
this.lblResult = new System.Windows.Forms.Label();
this.btn4 = new System.Windows.Forms.Button();
this.btn4Abort = new System.Windows.Forms.Button();
this.SuspendLayout();
//
// btn1
//
this.btn1.Location = new System.Drawing.Point(24, 99);
this.btn1.Name = "btn1";
this.btn1.Size = new System.Drawing.Size(141, 44);
this.btn1.TabIndex = 0;
this.btn1.Text = "创建线程并带参数传值1";
this.btn1.UseVisualStyleBackColor = true;
this.btn1.Click += new System.EventHandler(this.btn1_Click);
//
// btn2
//
this.btn2.Location = new System.Drawing.Point(24, 174);
this.btn2.Name = "btn2";
this.btn2.Size = new System.Drawing.Size(141, 39);
this.btn2.TabIndex = 1;
this.btn2.Text = "创建线程并带参数传值2";
this.btn2.UseVisualStyleBackColor = true;
this.btn2.Click += new System.EventHandler(this.btn2_Click);
//
// btn3
//
this.btn3.Location = new System.Drawing.Point(211, 174);
this.btn3.Name = "btn3";
this.btn3.Size = new System.Drawing.Size(131, 39);
this.btn3.TabIndex = 2;
this.btn3.Text = "通过线程池创建线程3";
this.btn3.UseVisualStyleBackColor = true;
this.btn3.Click += new System.EventHandler(this.btn3_Click);
//
// lblResult
//
this.lblResult.AutoSize = true;
this.lblResult.Location = new System.Drawing.Point(236, 115);
this.lblResult.Name = "lblResult";
this.lblResult.Size = new System.Drawing.Size(41, 12);
this.lblResult.TabIndex = 3;
this.lblResult.Text = "label1";
//
// btn4
//
this.btn4.Location = new System.Drawing.Point(211, 236);
this.btn4.Name = "btn4";
this.btn4.Size = new System.Drawing.Size(150, 44);
this.btn4.TabIndex = 4;
this.btn4.Text = "使用BackgroundWorker 4";
this.btn4.UseVisualStyleBackColor = true;
this.btn4.Click += new System.EventHandler(this.btn4_Click);
//
// btn4Abort
//
this.btn4Abort.Location = new System.Drawing.Point(211, 286);
this.btn4Abort.Name = "btn4Abort";
this.btn4Abort.Size = new System.Drawing.Size(150, 44);
this.btn4Abort.TabIndex = 5;
this.btn4Abort.Text = "4 取消当前操作";
this.btn4Abort.UseVisualStyleBackColor = true;
this.btn4Abort.Click += new System.EventHandler(this.btn4Abort_Click);
//
// Form1
//
this.AutoScaleDimensions = new System.Drawing.SizeF(6F, 12F);
this.AutoScaleMode = System.Windows.Forms.AutoScaleMode.Font;
this.ClientSize = new System.Drawing.Size(399, 339);
this.Controls.Add(this.btn4Abort);
this.Controls.Add(this.btn4);
this.Controls.Add(this.lblResult);
this.Controls.Add(this.btn3);
this.Controls.Add(this.btn2);
this.Controls.Add(this.btn1);
this.Name = "Form1";
this.Text = "Form1";
this.ResumeLayout(false);
this.PerformLayout();
}
#endregion
private System.Windows.Forms.Button btn1;
private System.Windows.Forms.Button btn2;
private System.Windows.Forms.Button btn3;
private System.Windows.Forms.Label lblResult;
private System.Windows.Forms.Button btn4;
private System.Windows.Forms.Button btn4Abort;
}
}
