[英]How to get datetimepicker c# winform checked/unchecked event
There is a check box in the datetimepicker control of winforms .net. winforms .net的datetimepicker控件中有一个复选框。 But I could not find the event that is triggered when the check box is checked or unchecked.
但是我找不到选中或取消选中复选框时触发的事件。 Is there a way out?
有出路吗?
It does however trigger the value changed event但是它确实触发了值更改事件
Run into the same issue.遇到同样的问题。 I needed a CheckedChangedEvent on a winforms DateTimePicker control.
我需要一个 Winforms DateTimePicker 控件上的 CheckedChangedEvent。 So with the inspiration of the answers before me I created an inherited User Control named DateTimePicker2, inheriting from DateTimePicker that implements this event.
因此,在我之前的答案的启发下,我创建了一个名为 DateTimePicker2 的继承用户控件,继承自实现此事件的 DateTimePicker。 It looks like it works but no guarantees.
看起来它有效,但不能保证。
using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Text;
using System.Windows.Forms;
namespace MyNameSpace
{
public partial class DateTimePicker2 : DateTimePicker
{
private bool _checked;
public new bool Checked
{
get
{
return base.Checked;
}
set
{
if (value != base.Checked)
{
base.Checked = value;
_checked = base.Checked;
OnCheckedChanged(new CheckedChangedEventArgs { OldCheckedValue = !value, NewCheckedValue = value });
}
}
}
public event CheckedChangedEventHandler CheckedChanged;
public DateTimePicker2()
{
InitializeComponent();
_checked = Checked;
}
protected virtual void OnCheckedChanged(CheckedChangedEventArgs e)
{
if (CheckedChanged != null) CheckedChanged(this, e);
}
private void DateTimePicker2_ValueChanged(object sender, EventArgs e)
{
if (Checked != _checked)
{
_checked = Checked;
CheckedChangedEventArgs cce = new CheckedChangedEventArgs { OldCheckedValue = !_checked, NewCheckedValue = _checked };
OnCheckedChanged(cce);
}
}
}
public delegate void CheckedChangedEventHandler(object sender, CheckedChangedEventArgs e);
public class CheckedChangedEventArgs : EventArgs
{
public bool OldCheckedValue { get; set; }
public bool NewCheckedValue { get; set; }
}
}
And off-course don't forget to subscribe to the DateTimePicker2_ValueChanged event from the designer.并且不要忘记订阅设计师的 DateTimePicker2_ValueChanged 事件。
The reason why I used both a new Checked property (to hide the base.Checked one) and a _checked field to keep truck of the old value, is because我使用新的 Checked 属性(隐藏 base.Checked 属性)和 _checked 字段来保留旧值的原因是因为
Basically a combination of both approaches was needed.基本上需要两种方法的组合。
I hope this helps.我希望这有帮助。
You´ll have to store the old "checked" value in order to compare to the new one, so you´ll be able to determine if the "checked" state has changed:您必须存储旧的“已检查”值才能与新值进行比较,因此您将能够确定“已检查”state 是否已更改:
bool oldDateChecked = false; //if it's created as not checked
private void dtp_filtro_date_ValueChanged(object sender, EventArgs e)
{
if (this.dtp_filtro_date.Checked != oldDateChecked)
{
oldDateChecked = this.dtp_filtro_date.Checked;
//do your stuff ...
}
}
I know this is super old but this could help someone.我知道这是超级旧的,但这可以帮助某人。
You can capture DataTimePicker.MouseUp
event您可以捕获
DataTimePicker.MouseUp
事件
private void dateTimePicker1_MouseUp(object sender, MouseEventArgs e)
{
if (((DateTimePicker)sender).Checked)
{
//Do whatever you need to do when the check box gets clicked
}
else
{
//Do another stuff...
}
}
You will need to do the same with KeyUp
event in order to get the Space key press that could also activate the checkbox.您需要对
KeyUp
事件执行相同的操作,才能获得同样可以激活复选框的 Space 按键。
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