Winform 彈出窗體等待

顯示效果：

FrmWaiting.cs:

public FrmWaitingBox(EventHandler<EventArgs> Method,string msg)
        {
            InitializeComponent();
            if (!string.IsNullOrEmpty(msg))
                lblTip.Text = msg;
            _Method = Method;
        }
private EventHandler<EventArgs> _Method;
        private IAsyncResult asyncResult;
        private void timer1_Tick(object sender, EventArgs e)
        {
            if (asyncResult.IsCompleted)
                this.Close();
        }
        /// <summary>
        /// 窗體第一次加載事件
        /// </summary>
        /// <param name="sender"></param>
        /// <param name="e"></param>
        private void FrmWaitingBox_Shown(object sender, EventArgs e)
        {
            asyncResult = _Method.BeginInvoke(null, null, null,null);
        }

Form1.cs:

private void btnStart_Click(object sender, EventArgs e)
        {
            var list = new List<User>();
            FrmWaitingBox waitingBox = new FrmWaitingBox((obj, args) =>
            {
                //Thread.Sleep(5000);
                for (int i = 1; i <= 50; i++)
                {
                    list.Add(new User {
                        Id=i,
                        UserName="Test"+i,
                        Age=18+i,
                        Birth=DateTime.Now
                    });
                }
                //this.Invoke(new Action(() =>
                //{
                //    dgvData.DataSource = list;
                //}));
            },"數據獲取中,請等待!");
            waitingBox.ShowDialog(this);
            dgvData.DataSource = list;
        }
        public class User
        {
            public int Id { get; set; }
            public string UserName { get; set; }
            public int Age { get; set; }
            public DateTime Birth { get; set; }
        }

源代碼下載：FrmWaiting

 第二種實時顯示進度：

源代碼：代碼下載

第二種源博客地址：https://www.cnblogs.com/lijuanfei/p/6080594.html