C#, winform - NumericUpDown max limit not validated on KeyPress?

Question

Using NumericUpDown control of C# winform application.

Set Maximun value as 99. But when I type value above 99, eg: 555, it allows me to key (key_press event )in values 555 and it changes back to max value (99) only if i leave the control. What i need is, user should not allowed to key in values more than 99. And also the default behaviour 'Up and Down action' values should not be affected by this. How do i do this?

@HansPassant: No doubt that's the best answer. Why don't you post that as an answer? — CharithJ
– CharithJ, Commented Oct 13, 2011 at 4:51

Oli · Accepted Answer · 2011-10-11 14:07:49Z

2

Just a quick idea:

public class StrictNumericUpDown : NumericUpDown
{
    protected override void OnTextBoxTextChanged(object source, EventArgs e)
    {
        base.OnTextBoxTextChanged(source, e);
        if (Value > Maximum)
        {
            Value = Maximum;
        }
    }
}

answered Oct 11, 2011 at 14:07

Oli

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1 Comment

LordWilmore Over a year ago

Just a thought but would it not be cleaner to only call base.OnTextBoxTextChanged(...) if (Value < Maximum)?

ABCD · Accepted Answer · 2012-05-10 23:46:07Z

1

Use

KeyUp

Event.

Or

((TextBox)numericUpDown1.Controls[1]).MaxLength = 2; // As Hans mentioned.

answered May 10, 2012 at 23:46

ABCD

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Comments

Dusty Lau · Accepted Answer · 2011-10-11 13:56:57Z

0

You can use the KeyDown event and validate the value when it fires.

answered Oct 11, 2011 at 13:56

Dusty Lau

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2 Comments

Dhanapal Over a year ago

tried, but it allows to key in values upto 3 digit, which ic more than 99...,

Nicholas Miller Over a year ago

For me, KeyDown is not able to validate & negate the action; however, KeyPress is.

jwvh · Accepted Answer · 2018-08-18 07:19:33Z

When we have used numericupdown control in c#, with the keypress, keydown/up events when you wanted to restrict the digit length limit in control like 2,3,4 ...etc for the limit-1 digits you select the value in control using ctrl+shift+left or right arrow key combination and press numeric key for new value, it is working fine, but when you select all digits( length limit) the new numeric key is not able to enter in numericupdown control due to handling event below image:

KeyDown event code snippet with issue

Hence, @ Hans Passant suggested type cast workaround is better to this problem.

Add this line in formload event or in InitializeComponent() method.

((TextBox)numericUpDown1.Controls\[1\]).MaxLength = 4;

For proper handling of 4 digits length limit in below code snippet:

KeyDown event code snippet with Solution

Thanks! Hans Passant

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