winform excel导入进度条

https://blog.csdn.net/feiyang5260/article/details/90272311

BackgroundWorker控件实现，不会假死

BackgroundWorker可在单独的线程上执行操作

步骤如下：

（1）主窗体设计，为主窗体添加一个BackgroundWorker控件和按钮控件

（2）主窗体后台代码Form1.cs

主窗体记得要绑定事件：

namespace progress_backgroundworker
{
    public partial class Form1 : Form
    {
        public Form1()
        {
            InitializeComponent();
            this.backgroundWorker1.WorkerReportsProgress = true;  //设置能报告进度更新
            this.backgroundWorker1.WorkerSupportsCancellation = true;  //设置支持异步取消
        }
 
        private void button1_Click(object sender, EventArgs e)
        {
            this.backgroundWorker1.RunWorkerAsync();  //运行backgroundWorker组件
            ProgressForm form = new ProgressForm(this.backgroundWorker1);  //显示进度条窗体
            form.ShowDialog(this);
            form.Close();
        }
 
        //在另一个线程上开始运行(处理进度条)
        private void backgroundWorker1_DoWork(object sender, DoWorkEventArgs e)
        {
            BackgroundWorker worker = sender as BackgroundWorker;
            for (int i = 0; i < 100; i++)
            {
                System.Threading.Thread.Sleep(100);
                worker.ReportProgress(i);
                if (worker.CancellationPending) //获取程序是否已请求取消后台操作
                {
                    e.Cancel = true;
                    break;
                }
            }
        }
 
        private void backgroundWorker1_RunWorkerCompleted(object sender, RunWorkerCompletedEventArgs e)
        {
            if (e.Error != null)
            {
                MessageBox.Show(e.Error.Message);
            }
            else if (e.Cancelled)
            {
                MessageBox.Show("取消");
            }
            else
            {
                MessageBox.Show("完成");
            }
        }
 
 
 
    }
}

（3）子窗体设计

 （4）子窗体代码实现ProgressForm.cs

namespace progress_backgroundworker
{
    public partial class ProgressForm : Form
    {
        private BackgroundWorker backgroundWorker1; //ProgressForm窗体事件(进度条窗体)
 
        public ProgressForm(BackgroundWorker bgWork)
        {
            InitializeComponent();
            // add my code
            this.backgroundWorker1 = bgWork;
            //绑定进度条改变事件
            this.backgroundWorker1.ProgressChanged += new ProgressChangedEventHandler(backgroundWorker1_ProgressChanged);
            //绑定后台操作完成，取消，异常时的事件
            this.backgroundWorker1.RunWorkerCompleted += new RunWorkerCompletedEventHandler(backgroundWorker1_RunWorkerCompleted);
        }
 
 
        void backgroundWorker1_ProgressChanged(object sender, ProgressChangedEventArgs e)
        {
            this.progressBar1.Value = e.ProgressPercentage;  //获取异步任务的进度百分比
        }
 
        void backgroundWorker1_RunWorkerCompleted(object sender, RunWorkerCompletedEventArgs e)
        {
            //this.Close();  //执行完之后，直接关闭页面
        }
 
        //取消
        private void btnCancel_Click(object sender, EventArgs e)
        {
            this.backgroundWorker1.CancelAsync(); //请求取消挂起的后台操作
            this.btnCancel.Enabled = false;
            this.Close();
        }
    }
}