日期时间挑选下来 [英] Date Time Picker Up Down

问题描述

如何在DateTimePicker中将上/下控制控制为仅几分钟？

解决方案

我认为有三种方法可以达到此目的。



1.编写自己的TimePicker控件，指定可以更改的内容。这是最难的解决方案，但是当您完全控制更改时最完整。



2.继承 DateTimePicker 并覆盖 OnValueChanged ，以便所有更改可以改变其他分钟被拒绝的内容。

这样的实现可能如下所示：

 公共 类 MyPicker 
 继承 DateTimePicker 
 
 私有上一个作为 DateTime 
 
 公共 < span class =code-keyword> Sub   New （）
 previous = Value 
 结束  Sub  
 
 受保护 覆盖  Sub  OnValueChanged（eventargs  As  System.EventArgs）
 如果 previous.Minute = Value.Minute 那么值=之前
 
之前=值
 结束  Sub  
 结束 类 

3.将活动结束正常的 DateTimePicker 实例，用于执行解决方案2中描述的逻辑。

可能看起来像这样：

< pre lang =vb> 公共 类 Form1

私有上一个 As DateTime

公共 Sub New （）
InitializeComponent（）

previous = DateTimePicker1.Value
结束 Sub

私有 Sub DateTim ePicker1_ValueChanged（发件人作为系统。对象，e As System.EventArgs）句柄 DateTimePicker1.ValueChanged
如果 previous.Minute = DateTimePicker1.Value .Minute 然后 DateTimePicker1.Value =上一个

previous = DateTimePicker1.Value
结束 Sub

结束 Class

请注意，解决方案2和3仍然允许用户选择其他字段，它们是正确的永远不允许改变。这可能让用户觉得不直观，所以我建议寻求解决方案1.



希望这会有所帮助，

Fredrik

How do I control the up/down controls to only minutes in DateTimePicker?

解决方案

As I see it there are three ways of achieving this.

1. Write your own TimePicker control where you dictate what can be changed. This is the hardest solution but the most complete as you get complete control of the changes.

2. Inherit DateTimePicker and override OnValueChanged in such a way that all changes that change something other that the minute are rejected.
Such an implementation might look something like this:

Public Class MyPicker
    Inherits DateTimePicker

    Private previous As DateTime

    Public Sub New()
        previous = Value
    End Sub

    Protected Overrides Sub OnValueChanged(eventargs As System.EventArgs)
        If previous.Minute = Value.Minute Then Value = previous

        previous = Value
    End Sub
End Class

3. Wire up the events on a normal DateTimePicker instance to do the logic described in solution 2.
That might look something like this:

Public Class Form1

    Private previous As DateTime

    Public Sub New()
        InitializeComponent()

        previous = DateTimePicker1.Value
    End Sub

    Private Sub DateTimePicker1_ValueChanged(sender As System.Object, e As System.EventArgs) Handles DateTimePicker1.ValueChanged
        If previous.Minute = DateTimePicker1.Value.Minute Then DateTimePicker1.Value = previous

        previous = DateTimePicker1.Value
    End Sub

End Class

Note that solution 2 and 3 still allows the user to select other fields, it's jut that they are never allowed to be changed. This might feel un-intuitive to the user so I recommend going for solution 1.

Hope this helps,
Fredrik

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