winform 多线程 progressbar

Question

小弟这两天才开始学winform，发现在winform程序UI界面使用progressbar控件时，UI就死在那里了，在网上查说要用多线程来做，就是不知道具体怎么做。谁能给个简单的例子，实现点击Button之后progressbar开始显示进度，但winform窗体不要卡死，能拖动。小弟先谢过了。

Answer 1

有些测试的代码，没有删，不好意思。
进度条的页面代码：这个是单独页面。上面有一个进度条和一个LABEL
  public partial class ProgressDlg : Form
    {
        public ProgressDlg()
        {
            InitializeComponent();
        }        public void OnProgressChanged(object sender, ProgressChangedEventArgs e)
        {
            // show the progress.
            this.progressBar.Value = e.ProgressPercentage;
            this.label1.Text = e.ProgressPercentage.ToString();
        }        public void OnCompleted(object sender, RunWorkerCompletedEventArgs e)
        {
            // thread is completed, close the dialog.
            this.progressBar.Value = 100;
            this.Close();
        }        public CancelEventHandler OnCancel = null;        private void btnCancel_Click(object sender, EventArgs e)
        {
            // thread is cancelled, close the dialog.
            this.Close();
        }        private void ProgressDlg_FormClosed(object sender, FormClosedEventArgs e)
        {
            // cast notification of cancellation.
            if (this.OnCancel != null)
                this.OnCancel(this, new CancelEventArgs());
        }    }
主界面的代码:此页面上有一个TEXTBOX，label和一个button.
 public partial class Form1 : Form
    {
        private BackgroundWorker _backworker = null;                public Form1()
        {
            InitializeComponent();
            this._backworker = new BackgroundWorker();
            // it's neccessary to set the properties.
            this._backworker.WorkerReportsProgress = true;
            this._backworker.WorkerSupportsCancellation = true;            this._backworker.DoWork += new DoWorkEventHandler(backworker_DoWork);
            this._backworker.ProgressChanged += new ProgressChangedEventHandler(backworker_ProgressChanged);
            this._backworker.RunWorkerCompleted += new RunWorkerCompletedEventHandler(backworker_RunWorkerCompleted);        }        // body of thread
        void backworker_DoWork(object sender, DoWorkEventArgs e)
        {
            for (int i = 0; i < 100; i++)
            {
                Thread.Sleep(100);                // trigger the event: ProgressChanged
                this._backworker.ReportProgress(i);                // if receive the notification of Cancel.
                if (this._backworker.CancellationPending)
                {
                    e.Cancel = true;
                    return;
                }
            }
        }        void backworker_ProgressChanged(object sender, ProgressChangedEventArgs e)
        {
            // to do nothing.
        }        void backworker_RunWorkerCompleted(object sender, RunWorkerCompletedEventArgs e)
        {
            // if thread is completed because of cancellation.
            if (e.Cancelled)
                this.labelSummary.Text = "Calculation is cancelled";            this.btnCalculate.Enabled = true;
        }        void backworker_OnCancel(object sender, CancelEventArgs e)
        {
            this._backworker.CancelAsync();
        }        private void btnCalculate_Click(object sender, EventArgs e)
        {
            string temp = this.txtMax.Text.Trim();
            if (string.IsNullOrEmpty(temp))
                MessageBox.Show("Please input a valid integer.", "Validation", MessageBoxButtons.OK, MessageBoxIcon.Exclamation);
            else
            {
                ProgressDlg progressDlg = new ProgressDlg();
                // if thread is executing, dialog will show the progress.
                this._backworker.ProgressChanged += new ProgressChangedEventHandler(progressDlg.OnProgressChanged);
                this._backworker.RunWorkerCompleted += new RunWorkerCompletedEventHandler(progressDlg.OnCompleted);
                // if cancel in progressDlg, let me know and do something.
                progressDlg.OnCancel += new CancelEventHandler(backworker_OnCancel);                this.btnCalculate.Enabled = false;
                progressDlg.Show();                // start the thread.
                this._backworker.RunWorkerAsync();
            }
        }        private void Form1_Load(object sender, EventArgs e)
        {
           
           
             
        }    }

Answer 2

Backgroudworker，用来干这个最好的东西

Answer 3

如何增加进度条的进度呢？
用Timer可以，用Thread也可以(4.0还可以用Task)