执行异步UI更新

异步更新UI的几种方法
①.使用Control.Invoke方式来更新数据        
            foreach (DataGridViewRow dgvr in this.dgv_selected.Rows)
            {
                Application.DoEvents();
                this.progressBar1.Invoke(new MethodInvoker(delegate { this.progressBar1.Maximum = this.dgv_selected.Rows.Count; }));

//this.progressBar1.Invoke(new MethodInvoker(delegate { this.label12.Text = "正在保存:" + dgvr.Cells["Column3"].Value.ToString(); }));
                this.label12.Invoke(new MethodInvoker(delegate { this.label12.Text = "操作进度:" + dgvr.Cells["Column3"].Value.ToString(); }));
                this.label12.Refresh();

this.progressBar1.Invoke(new MethodInvoker(delegate { this.progressBar1.Value++; }));
             }

②.使用委托来更新：
        private delegate void IncreaseProgressBarValue(string username);
        private void updateProgerssBar(string username)
        {
            if (this.progressBar1.InvokeRequired)
            {
                IncreaseProgressBarValue inc = new IncreaseProgressBarValue(updateProgerssBar);
                this.progressBar1.Invoke(inc,new object[]{username});
            }
            else
            {
                this.progressBar1.Value++;
                this.label12.Text = "查询员工:" + username;
                this.label12.Refresh();
            }
        }
使用下面的方式调用委托：
        ThreadStart ts = delegate { updateProgerssBar(dgvr.Cells["EmpName"].Value.ToString()); };
        new Thread(ts).Start();

③.在.net framework4.0中使用TaskScheduler来实时更新UI
        private void AsyncWork()
        {
            // This scheduler will execute tasks
            // on the current SynchronizationContext
            // That is, it will access UI controls safely
            var uis = TaskScheduler.FromCurrentSynchronizationContext();
            for (int i = 0; i < 100; i++)
            {
                Application.DoEvents();
                Task.Factory.StartNew(() =>
                {
                    updateProgressBar();
                }, new CancellationToken(), TaskCreationOptions.None, uis);
            }  
        }
        private void updateProgressBar()
        {
            this.progressBar1.Value++;
            Thread.Sleep(100);
        }