C＃Winforms中的文本框验证-应该只允许1-100之间的数字

Question

Hello Sorry its a simple question, but would appreciate if someone can guide me with the code. I have say 50 textboxes in my Winform. All should allow only numeric values and that too between 1-100 only. How should I ensure this validation?

My thoughts was using e.Keychar in keypress event using Ascii values to restrict users to type only numerics. Also, probably I can ensure this validation in Set in the property? But I don't know if I am correct and also don't know right code. Please help me.

Answer 1

Use NumericUpDown instead of normal TextBox box with validation.

A NumericUpDown control contains a single numeric value that can be incremented or decremented by clicking the up or down buttons of the control. The user can also enter in a value, unless the ReadOnly property is set to true.

You can specify the minimum and maximum numbers, it will allow the user to enter numbers between 1 and 100 and also let them use up and down buttons.

EDIT: If you want to do it through code then you can try something like in KeyPress event of your TextBox :

private void yourTextBox_KeyPress(object sender, KeyPressEventArgs e)
{
    if (!char.IsControl(e.KeyChar)
        && !char.IsDigit(e.KeyChar))
    {
        e.Handled = true;
    }
}

The above can be improved to access . for decimal numbers, but I guess you got the idea.