SendKeys.Send使我的系统挂起 [英] SendKeys.Send make my system hangs

问题描述

我开发了adatetimepicker自定义控件
我的日期格式是yyyy/MM/dd
我想输入年份yyyy的4位数字，然后课程进入月份部分，依此类推
因此，在CustomDateTimePicker_ValueChanged事件中，我编写了此代码

i developed adatetimepicker custom control
my date format is yyyy/MM/dd
i want to typed 4 digit of year yyyy then courser go to month section and so on
so in CustomDateTimePicker_ValueChanged event i wrote this code

private void CustomDateTimePicker_ValueChanged(object sender, EventArgs e)
    {


          SendKeys.Send("{RIGHT}");

     }

但是当调试到达SendKeys时，我的系统挂起
plz 请问我真的需要帮助吗?

but when debug reach to SendKeys my system hangs
plz Please really I need help?

推荐答案

机会是因为您是从ValueChanged事件处理程序发送此消息的，所以SendKeys将向当前控件发送一个右键-即CustomDateTimePicker，并且它(无论出于何种原因)都会导致ValueChanged事件.发出一个RIGHT，这导致...您明白了.

为什么要发送密钥?通常，这是控件设计错误的一个示例-您试图实现什么，以为您认为这是一个很好的解决方案?为什么不只使用Focus方法将焦点设置为月份呢?

The chances are that because you are sending this from a ValueChanged event handler, the effect of the SendKeys is to send a RIGHT key to the current control - i.e. the CustomDateTimePicker, and that it is (for whatever reason) causing a ValueChanged Event. Which sends a RIGHT, which causes... you get the idea.

Why are you sending keys around? Normally, that is an example of a badly designed control - what are you trying to achieve that you think this is a good solution? Why not just use the Focus method to set the focus to the month?

请查看我对OriginalGriff答案的评论.切勿将SendKeys用于此类情况.您可以将System.Windows.Forms.Control.SelectNextControl或System.Windows.Forms.Control.GetNextControl与System.Windows.Forms.Control.Focus结合使用.请参阅:
http://msdn.microsoft.com/en-us/library/system. windows.forms.control.aspx [ ^ ].

—SA

Please see my comment to the answer by OriginalGriff. Never use SendKeys for such things. You can use System.Windows.Forms.Control.SelectNextControl, or System.Windows.Forms.Control.GetNextControl in combination with System.Windows.Forms.Control.Focus. Please see:
http://msdn.microsoft.com/en-us/library/system.windows.forms.control.aspx[^].

—SA

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