如何控制 DateTimePicker 中的时间间隔答案

【问题标题】：How to contol the time interval in a DateTimePicker如何控制 DateTimePicker 中的时间间隔
【发布时间】：2009-12-04 10:18:28
【问题描述】：

我在这样指定的表单上有一个 DateTimePicker 控件：

dtpEntry.Format = DateTimePickerFormat.Custom;
dtpEntry.CustomFormat = "dd/MM/yyyy hh:mm:ss";
dtpEntry.ShowUpDown = true;

我希望用户只能以 5 分钟为增量增加或减少时间。

关于如何实现这一点的任何建议？

【问题讨论】：

标签： c# winforms datetimepicker

【解决方案1】：

可以通过观察 ValueChanged 事件并覆盖该值。此示例表单效果很好：

public partial class Form1 : Form {
    public Form1() {
        InitializeComponent();
        dateTimePicker1.CustomFormat = "dd/MM/yyyy hh:mm";
        dateTimePicker1.Format = DateTimePickerFormat.Custom;
        dateTimePicker1.ShowUpDown = true;
        dateTimePicker1.Value = DateTime.Now.Date.AddHours(DateTime.Now.Hour);
        mPrevDate = dateTimePicker1.Value;
        dateTimePicker1.ValueChanged += new EventHandler(dateTimePicker1_ValueChanged);
    }
    private DateTime mPrevDate;
    private bool mBusy;

    private void dateTimePicker1_ValueChanged(object sender, EventArgs e) {
        if (!mBusy) {
            mBusy = true;
            DateTime dt = dateTimePicker1.Value;
            if ((dt.Minute * 60 + dt.Second) % 300 != 0) {
                TimeSpan diff = dt - mPrevDate;
                if (diff.Ticks < 0) dateTimePicker1.Value = mPrevDate.AddMinutes(-5);
                else dateTimePicker1.Value = mPrevDate.AddMinutes(5);
            }
            mBusy = false;
        }
        mPrevDate = dateTimePicker1.Value;
    }
}

【讨论】：

这很好用，我需要做的就是为我的情况调整AddMinutes() 中的值，它实际上是即插即用的。

【解决方案2】：

我对 SixOThree 的答案稍作改动，以消除 Necromporph 发现的错误。应该是这样的：

在课堂上

private DateTime prevTimePicker1;
private bool navigatingDateTimePicker = false;

在构造函数中

prevTimePicker1 = dateTimePickerStart.Value;
navigatingDateTimePicker = false;

事件

private void dateTimePickerStart_ValueChanged(object sender, EventArgs e)
{
  if (!navigatingDateTimePicker) {
    /* First set the navigating flag to true so this method doesn't get called again while updating */
    navigatingDateTimePicker = true;

    /* using timespan because that's the only way I know how to round times well */
    TimeSpan tempTS = dateTimePickerStart.Value - dateTimePickerStart.Value.Date;
    TimeSpan roundedTimeSpan;

    TimeSpan TDBug = dateTimePickerStart.Value - prevTimePicker1;
    if (TDBug.TotalMinutes == 59)
    {
        // first: if we are going back and skipping an hour it needs an adjustment
        roundedTimeSpan = TimeSpan.FromMinutes(5 * Math.Floor((tempTS.TotalMinutes - 60) / 5));
        dateTimePickerStart.Value = dateTimePickerStart.Value.Date + roundedTimeSpan;
    }
    else if (dateTimePickerStart.Value > prevTimePicker1)
    {
        // round up to the nearest interval
        roundedTimeSpan = TimeSpan.FromMinutes(5 * Math.Ceiling(tempTS.TotalMinutes / 5));
        dateTimePickerStart.Value = dateTimePickerStart.Value.Date + roundedTimeSpan;
    } else {
        // round down to the nearest interval from prev
        roundedTimeSpan = TimeSpan.FromMinutes(5 * Math.Floor(tempTS.TotalMinutes / 5));
        dateTimePickerStart.Value = dateTimePickerStart.Value.Date + roundedTimeSpan;
    }
    navigatingDateTimePicker = false;
  }
  prevTimePicker1 = dateTimePickerStart.Value;
}

【讨论】：

【解决方案3】：

问题在于上/下控件会自动增加或减少日期/时间选择器当前突出显示的部分（即年/月/日/小时/等）。

您最好在日期/时间选择器附近添加自己的上/下控件（可能是一个非常小的 vscrollbar），并将其连接到从日期/时间选择器的值开始递增/递减五分钟间隔。

【讨论】：

【解决方案4】：

或者干脆试试这个：

private void dateTimePicker1_ValueChanged(object sender, EventArgs e)
{
    if (this.dateTimePicker1.Value.Minute % 5 == 0)
        return;

    if (this.dateTimePicker1.Value.Minute % 5 == 1)
        this.dateTimePicker1.Value = this.dateTimePicker1.Value.AddMinutes(4);

    if (this.dateTimePicker1.Value.Minute % 5 == 4)
        this.dateTimePicker1.Value = this.dateTimePicker1.Value.AddMinutes(-4);
}

【讨论】：

【解决方案5】：

我知道这是一篇旧文章，但我根据上面的答案为这个问题创建了一个更好的解决方案。

在课堂上

private DateTime prevTimePicker1;
private bool navigatingDateTimePicker = false;

在构造函数中

prevTimePicker1 = dateTimePickerStart.Value;
navigatingDateTimePicker = false;

事件

private void dateTimePickerStart_ValueChanged(object sender, EventArgs e)
{
  if (!navigatingDateTimePicker) {
    /* First set the navigating flag to true so this method doesn't get called again while updating */
    navigatingDateTimePicker = true;

    /* using timespan because that's the only way I know how to round times well */
    TimeSpan tempTS = dateTimePickerStart.Value - dateTimePickerStart.Value.Date;
    TimeSpan roundedTimeSpan;

    if (dateTimePickerStart.Value > prevTimePicker1) {
      // round up to the nearest interval
      roundedTimeSpan = TimeSpan.FromMinutes(5 * Math.Ceiling(tempTS.TotalMinutes / 5));
      dateTimePickerStart.Value = dateTimePickerStart.Value.Date + roundedTimeSpan;
    } else {
      // round down to the nearest interval from prev
      roundedTimeSpan = TimeSpan.FromMinutes(5 * Math.Floor(tempTS.TotalMinutes / 5));
      dateTimePickerStart.Value = dateTimePickerStart.Value.Date + roundedTimeSpan;
    }
    navigatingDateTimePicker = false;
  }
  prevTimePicker1 = dateTimePickerStart.Value;
}

【讨论】：

我喜欢你的回答 SixOThree，但我尝试使用它，它在上升时效果很好，上升就像一个魅力。但是，如果您在它到达“00”时将其降低，它就会开始使小时数增加。我试图在我们说话的时候找出原因。一旦修复了这个错误，我相信这将是一个很棒的功能。

【解决方案6】：

您可以添加此代码

int minuteDiff = dtpJamAppointmentDokter.Value.Minute - prevTimePicker1.Minute;

if (minuteDiff == 59)
{
    dtpJamAppointmentDokter.Value =  dtpJamAppointmentDokter.Value.AddHours(-1);
}

之前

TimeSpan tempTS = dtpJamAppointmentDokter.Value - dtpJamAppointmentDokter.Value.Date;

【讨论】：