TimePicker Windows Phone 7 的 NullReferenceException

发布于 2024-12-29 21:39:21 字数 485 浏览 1 评论 0原文

我在我的应用程序中使用时间选择器，但每当我给它一个默认值时，NullReferenceException就会出现在valuechange函数中。我的代码

 private void timePicker1_ValueChanged(object sender, DateTimeValueChangedEventArgs e)
    {

        var time = (DateTime)timePicker1.Value;

        // time.ToShortTimeString()
        MessageBox.Show(time.ToString("H:mm"));

        writeTimeFile(time);
        ResetAlarm();
        setTheAlarm();


    }

实际上是每当我启动我的应用程序时，时间选择器显示当前时间，但我希望它显示一些特定值，比如00:00或 12:00。

原文

I am using timepicker in my application but whenever I give it a default value then NullReferenceException appears in valuechange function.My code is

 private void timePicker1_ValueChanged(object sender, DateTimeValueChangedEventArgs e)
    {

        var time = (DateTime)timePicker1.Value;

        // time.ToShortTimeString()
        MessageBox.Show(time.ToString("H:mm"));

        writeTimeFile(time);
        ResetAlarm();
        setTheAlarm();


    }

Actually whenever I start my application,the timepicker shows current time but I want it to show some specific value say 00:00 or 12:00.

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落日海湾 2025-01-05 21:39:21

确保您正确设置时间选择器对象的值。这对我有用。另请验证其他内容是否不会引发 NullReferenceException。

    public TimePage()
    {
        InitializeComponent();
        // setting default value for TimePicker here
        EventTimePicker.Value = DateTime.Parse("12:00 AM");
    }

    private void TimePicker_ValueChanged(object sender, DateTimeValueChangedEventArgs e)
    {
        var time = (DateTime) EventTimePicker.Value;
        MessageBox.Show(time.ToShortTimeString());
    }

Make sure you are setting the value of your time picker object correctly. This worked for me. Also verify something else isn't throwing the NullReferenceException.

    public TimePage()
    {
        InitializeComponent();
        // setting default value for TimePicker here
        EventTimePicker.Value = DateTime.Parse("12:00 AM");
    }

    private void TimePicker_ValueChanged(object sender, DateTimeValueChangedEventArgs e)
    {
        var time = (DateTime) EventTimePicker.Value;
        MessageBox.Show(time.ToShortTimeString());
    }

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