• 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();
            }
        }
    }
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  • 原文地址:https://www.cnblogs.com/niyl/p/15686642.html
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