Track UpDown Exceeding

Question

There is a NumericUpDown, which is set to the maximum value:

this.DimCountUpDown.Maximum = new decimal(new int[] { 10000, 0, 0, 0});

I need to track when the user enters more than 10,000,000 from the keyboard and give him the corresponding notification. I try to do this:

  private void DimCountUpDown_KeyUp(object sender, KeyEventArgs e) { if (DimCountUpDown.Value > 10000) { MessageBox.Show("Значение не должно превышать 10000", "Ошибка ввода"); DimCountUpDown.Value = 10000; } }

However, before getting here the entered value (for example, 10001) is automatically set to a maximum (10,000) and, accordingly, the condition does not work ...

And if you remove the line this.DimCountUpDown.Maximum = ... in general?
@VladD, if you remove it, the default value for this control is set to 100.

VladD VladD 183k sixteen 222 432 · Accepted Answer · 2015-12-20T20:10:53

The idea is that your check happens in DimCountUpDown_KeyUp , so you need to disable the action of the maximum. To do this, it is enough to put in Maximum value greater than 10,000, for example, 10001. Or not to think, you can simply put the maximum possible:

 this.DimCountUpDown.Maximum = decimal.MaxValue;

By the way, in Form1.Designer.cs the string <! - language: c # -> this.DimCountUpDown.Maximum = decimal.MaxValue;
converted to <! - language: c # -> this.DimCountUpDown.Maximum = new decimal (new int [] {-1, -1, -1, 0});
The documentation describes the exact meaning of these bytes.

Answer 2 · 2015-12-20T19:50:23

DimCountUpDown_KeyUp

Connect the handler to the KeyDown event.

UPDATE:

NumericUpDown is a container for controls: UpDownButtons and UpDownEdit.
Despite the fact that they are not public, but the base class is Control.
If you need to display a message when pressing updown, you can connect the handler to the Click event.

 var max = 10000; // обработчик нажатия кнопки updown void UpDownButton_Click(object sender, EventArgs e) { var c = (sender as Control).Parent as NumericUpDown; // выводим сообщение if (c.Value == max) { MessageBox.Show("Значение не должно превышать " + max, "Ошибка ввода"); } } var f = new Form(); var c = new NumericUpDown() { Parent = f, Maximum = max, Value = 9999 }; // подключаем обработчик к updown foreach (var b in c.Controls.OfType<Control>()) b.Click += UpDownButton_Click; f.ShowDialog();

This is not an option, because there in DimCountUpDown.Value will be the previous value. - UnityMan

Track UpDown Exceeding

2 answers 2

More articles: