如何在WPF中使用计时器滴答事件

本文介绍了如何在WPF中使用计时器滴答事件的处理方法，对大家解决问题具有一定的参考价值，需要的朋友们下面随着小编来一起学习吧！ 问题描述

我正在使用计时器滴答事件来更新使用此代码从Web服务绑定的文本框中的值.

i am using timer tick event to update values in textboxes binded from webservice using this code.

private void timer1_Tick(object sender, EventArgs e) { // timer.Interval = TimeSpan.FromSeconds(30); //activityGrid.DataContext = ActivityDataSet.Tables[0].DefaultView; var query = from data in ActivityDataSet.Tables[0].AsEnumerable() select new { ActivityType = data.Field<string>("ActLabel_Name"), ActivityName = data.Field<string>("ActivityName"), StartDate = data.Field<DateTime>("StartDt"), EndDate = data.Field<DateTime>("EndDt"), Instructor = data.Field<string>("InstName"), Location = data.Field<string>("Fac_Name"), Venue = data.Field<string>("Loc_Name") }; //activityGrid.DataContext = query.ToList(); int i = 1; while (i != 0) { i = i + 1; { //here spcalendar is staclpanel to which iam binding spCalendar.DataContext = query.ToList().ElementAt(i); break; } }

文本框仅一次更新，第二次不更新，问题是"i"的增量值没有更新，有人帮助了我.在这里，timesapn为1分钟.

textboxes are updating one time only ,second time they are not updating ,the problem is ''i''s incremented value is not getting updated someone help me out.here timesapn i gave as 1 minute.

推荐答案

原因如下: It''s because of this: int i = 1; while (i != 0) { i = i + 1; ...

您要告诉它在我不等于零时循环播放，并且根据您发布的代码，它绝不会等于零.最终，该代码将引发异常，因为i将索引超出列表的范围.

You''re telling it to loop while i is not equal to zero, and it''ds NEVER equal to zero based on the code you''ve posted. Eventually, ythat code will throw an exception because i will index beyond the bounds of the List.