How to make NumericUpDown ReadOnly

问题

I would like to make WinForms NumericUpDown control non-editable or at least spin control should be disabled. I tried setting the control readonly but using mouse scroll values are changing. Please help me to achieve this.

回答1:

Try the following in order to set the numeric up/down as read-only:

numericUpDown1.ReadOnly = true;    
numericUpDown1.Increment = 0;

I hope it helps.

回答2:

Another alternative is to subclass NumericUpDown and override the DownButton and UpButton methods so they return early when ReadOnly is set:

public override void DownButton()
{
   if(this.ReadOnly)
      return;

   base.DownButton();
}

public override void UpButton()
{
   if(this.ReadOnly)
      return;

   base.UpButton();
}

This appears to also prevent up/down arrow presses and mouse scrolls from changing the value.

The benefit of this approach is that you can now data bind the ReadOnly property on the control and expect it to make the value read-only instead of just the text area.

来源：https://stackoverflow.com/questions/28621403/how-to-make-numericupdown-readonly