ProgressChanged改变进度条好像不能同步

        private void PrintItem_DoWork(object sender, DoWorkEventArgs e)

        {

            int i = 0;

            printlist = new ArrayList();

            foreach (string[] pl in addlist)

            {

                if (pl[6] == "")

                {

                    pl[6] = "该订单打印完成";

                }

                i++;

                printlist.Add(pl);

                Thread.Sleep(1000);

                this.PrintItem.ReportProgress(i, string.Format("{0}%", i));

            }

        }



        private void PrintItem_ProgressChanged(object sender, ProgressChangedEventArgs e)

        {

            this.toolStripProgressBar.Value = e.ProgressPercentage;

            this.toolStripLabel.Text = "已完成：" + e.ProgressPercentage / this.toolStripProgressBar.Maximum * 100 + " %";

        }

补充：.NET技术 ,  C#

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