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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();
}
}
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原文地址:http://www.cnblogs.com/ZLGBloge/p/4208837.html