第一种：使用BackgroundWorker进行进度条控制BackgroundWorker对象有三个主要的事件：DoWork - 当BackgroundWorker对象的多线程操作被执行时触发。RunWokerCompleted - 当BackgroundWoker对象的多线程操作完成时触发。ProgressChanged - 当BackgroundWorker对象的多线程操作状态改变时触发。WorkerReportsProgress - 如果想让BackgroundWorker对象以异步的方式报告线程实时进度，必须将该属性的值设为true。BackgroundWorker对象的ReportProgress方法用于向主线程返回后台线程执行的实时进度。
实例代码一，控制主窗体中的进度条显示
public partial class Form1 : Form
{ /// <summary> /// 后台线程 /// </summary> private BackgroundWorker bkWorker = new BackgroundWorker();/// <summary>
/// 步进值 /// </summary> private int percentValue = 0;public Form1()
{ InitializeComponent();bkWorker.WorkerReportsProgress = true;
bkWorker.WorkerSupportsCancellation = true; bkWorker.DoWork += new DoWorkEventHandler(DoWork); bkWorker.ProgressChanged += new ProgressChangedEventHandler(ProgessChanged); bkWorker.RunWorkerCompleted += new RunWorkerCompletedEventHandler(CompleteWork); }private void btnStart_Click(object sender, EventArgs e)
{ percentValue = 10; this.progressBar1.Maximum = 1000; // 执行后台操作 bkWorker.RunWorkerAsync(); }public void DoWork(object sender, DoWorkEventArgs e)
{ // 事件处理，指定处理函数 e.Result = ProcessProgress(bkWorker, e); }public void ProgessChanged(object sender, ProgressChangedEventArgs e)
{ // bkWorker.ReportProgress 会调用到这里，此处可以进行自定义报告方式 this.progressBar1.Value = e.ProgressPercentage; int percent = (int)(e.ProgressPercentage / percentValue); this.label1.Text = "处理进度:" + Convert.ToString(percent) + "%"; }public void CompleteWork(object sender, RunWorkerCompletedEventArgs e)
{ this.label1.Text = "处理完毕!"; }private int ProcessProgress(object sender, DoWorkEventArgs e)
{ for (int i = 0; i <= 1000; i++) { if (bkWorker.CancellationPending) { e.Cancel = true; return -1; } else { // 状态报告 bkWorker.ReportProgress(i);// 等待，用于UI刷新界面，很重要
System.Threading.Thread.Sleep(1); } }return -1;
} }
实例代码二，控制弹出窗体中的进度条显示
主窗体代码：public partial class Form1 : Form
{ private BackgroundWorker bkWorker = new BackgroundWorker(); private Form2 notifyForm = new Form2();public Form1()
{ InitializeComponent();// 使用BackgroundWorker时不能在工作线程中访问UI线程部分，
// 即你不能在BackgroundWorker的事件和方法中操作UI，否则会抛跨线程操作无效的异常 // 添加下列语句可以避免异常。 CheckForIllegalCrossThreadCalls = false;bkWorker.WorkerReportsProgress = true;
bkWorker.WorkerSupportsCancellation = true; bkWorker.DoWork += new DoWorkEventHandler(DoWork); bkWorker.ProgressChanged += new ProgressChangedEventHandler(ProgessChanged); bkWorker.RunWorkerCompleted += new RunWorkerCompletedEventHandler(CompleteWork); }private void btnStart_Click(object sender, EventArgs e)
{ notifyForm.StartPosition = FormStartPosition.CenterParent;bkWorker.RunWorkerAsync();
notifyForm.ShowDialog(); }public void DoWork(object sender, DoWorkEventArgs e)
{ // 事件处理，指定处理函数 e.Result = ProcessProgress(bkWorker, e); }public void ProgessChanged(object sender, ProgressChangedEventArgs e)
{ // bkWorker.ReportProgress 会调用到这里，此处可以进行自定义报告方式 notifyForm.SetNotifyInfo(e.ProgressPercentage, "处理进度:" + Convert.ToString(e.ProgressPercentage) + "%"); }public void CompleteWork(object sender, RunWorkerCompletedEventArgs e)
{ notifyForm.Close();MessageBox.Show("处理完毕!");
}private int ProcessProgress(object sender, DoWorkEventArgs e)
{ for (int i = 0; i <= 1000; i++) { if (bkWorker.CancellationPending) { e.Cancel = true; return -1; } else { // 状态报告 bkWorker.ReportProgress(i / 10);// 等待，用于UI刷新界面，很重要
System.Threading.Thread.Sleep(1); } }return -1;
} }
子窗体代码:
public partial class Form2 : Form
{ public Form2() { InitializeComponent(); }public void SetNotifyInfo(int percent, string message)
{ this.label1.Text = message; this.progressBar1.Value = percent; } }
第二种，使用Thread来实现
使用Thread实现，虽然步骤上比较麻烦，但是调用流程比较简单，也是一种可以参考的方法使用时，首先要定义代理以及函数，然后实现线程函数，在线程函数中调用代理，最后启动线程，传入线程函数。下面是实例代码：
public partial class Form1 : Form
{ private Form2 progressForm = new Form2(); // 代理定义，可以在Invoke时传入相应的参数 private delegate void funHandle(int nValue); private funHandle myHandle = null;public Form1()
{ InitializeComponent(); }private void btnStart_Click(object sender, EventArgs e)
{ // 启动线程 System.Threading.Thread thread = new System.Threading.Thread(new System.Threading.ThreadStart(ThreadFun)); thread.Start(); }/// <summary>
/// 线程函数中调用的函数 /// </summary> private void ShowProgressBar() { myHandle = new funHandle(progressForm.SetProgressValue); progressForm.ShowDialog(); }/// <summary>
/// 线程函数，用于处理调用 /// </summary> private void ThreadFun() { MethodInvoker mi = new MethodInvoker(ShowProgressBar); this.BeginInvoke(mi);System.Threading.Thread.Sleep(1000); // sleep to show window
for (int i = 0; i < 1000; ++i)
{ System.Threading.Thread.Sleep(5); // 这里直接调用代理 this.Invoke(this.myHandle, new object[] { (i / 10) }); } } }
子窗体代码
public partial class Form2 : Form
{ public Form2() { InitializeComponent(); }public void SetProgressValue(int value)
{ this.progressBar1.Value = value; this.label1.Text = "Progress :" + value.ToString() + "%";// 这里关闭，比较好，呵呵！
if (value == this.progressBar1.Maximum - 1) this.Close(); } }