NumericUpDown differentiate up and down
-
03-07-2021 - |
Frage
I have a WinForm with some numreicUpDown Controls, i want to know if the value has been incremented or decremented. the control fires the event value changed for both situations, and as far as i can understand the programm calls the methods UpButton and DownButton. Is there any other way to know how the value has been changed or do i have to do this with this methods(like firing eventor implementig my code in Up-Down-Button)
Lösung
There is no standart way to do this. I sugest to remember the old value and compare it with new one
decimal oldValue;
private void ValueChanged(object sender, EventArgs e)
{
if (numericUpDown.Value > oldValue)
{
}
else
{
}
oldValue = numericUpDown.Value;
}
Andere Tipps
Create your own control that overrides those UpButton and DownButton methods:
using System.Windows.Forms;
public class EnhancedNUD : NumericUpDown
{
public event EventHandler BeforeUpButtoning;
public event EventHandler BeforeDownButtoning;
public event EventHandler AfterUpButtoning;
public event EventHandler AfterDownButtoning;
public override void UpButton()
{
if (BeforeUpButtoning != null) BeforeUpButtoning.Invoke(this, new EventArgs());
//Do what you want here...
//Or comment out the line below and do your own thing
base.UpButton();
if (AfterUpButtoning != null) AfterUpButtoning.Invoke(this, new EventArgs());
}
public override void DownButton()
{
if (BeforeDownButtoning != null) BeforeDownButtoning.Invoke(this, new EventArgs());
//Do what you want here...
//Or comment out the line below and do your own thing
base.DownButton();
if (AfterDownButtoning != null) AfterDownButtoning.Invoke(this, new EventArgs());
}
}
Then when you implement the control on your form, you can hook up some of the events to let you know which button was clicked or key (up/down) hit.