Decimal TextBox that get for example 1.54

Question

1.00/5 (1 vote)

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hello
i have a textBox than write in Event OnKeyPress below code

C#

protected override void OnKeyPress(KeyPressEventArgs e)
{
    e.Handled = !char.IsDigit(e.KeyChar) && !char.IsControl(e.KeyChar);
    base.OnKeyPress(e);
}

it only get integer
it don't get "." for decimal number for example 5.3
how i can change above code for my purpose? :):)

Posted 11-May-12 8:01am

faezun

Updated 11-May-12 19:03pm

v4

Add a Solution

7 solutions

Solution 6

C#

if (!char.IsControl(e.KeyChar) && !char.IsDigit(e.KeyChar) && e.KeyChar != '.')
    {
        e.Handled = true;
    }

if (e.KeyChar == '.' && (sender as TextBox).Text.IndexOf('.') > -1)
    {
        e.Handled = true;
    }

Posted 11-May-12 21:13pm

summon_19

Comments

faezun 12-May-12 5:00am

Error 1 The name 'sender' does not exist in the current context

Solution 5

hi,

C#

private void textBox1_KeyPress(object sender, KeyPressEventArgs e)
       {
           if (!(e.KeyChar >= '0' && e.KeyChar <= '9' ||  e.KeyChar =='.'))

{
count=0;
if(!e.keychar=='.')
{
    count++;
    if(count>1)
        e.Handled=false;
}
else
e.Handled = true;
}
}

Posted 11-May-12 20:58pm

Rockstar_

Solution 2

You can do the following:

C#

protected override void OnKeyPress(KeyPressEventArgs e)
{
    e.Handled = !(char.IsDigit(e.KeyChar) || (e.KeyChar == Keys.Decimal && !textBox.Text.Contains(".")) && !char.IsControl(e.KeyChar);
    base.OnKeyPress(e);
}

You will need to worry about multiple decimal points. You might want to check if the textbox already has a decimal point. I do not work with WinForms anymore, but the value in the textbox should be what the value is before the entry. I am also suspicious that there is no sender in the OnKeyPress method.

Posted 11-May-12 10:31am

Clifford Nelson

Comments

faezun 12-May-12 0:53am

thanks
do you test it?
it have several errors!

Error 1 ) expected
Error 2 Operator '==' cannot be applied to operands of type 'char' and 'System.Windows.Forms.Keys'
Error 3 The name 'textBox' does not exist in the current context

Clifford Nelson 12-May-12 1:19am

Could not test it since did not have WinForms application. Not even sure what the envirnement is since did not state the environment. Does not appear to be WinForm or WPF. the two i am most familiar with, and both have sender in the call. Gives you the idea though. If e.KeyChar == Keys.Decimal does not work, maybe you can just do e.KeycChar == '.'

Solution 3

Hi Friends,

This may help you ,,
try this below code...

C#

if (char.IsDigit(e.KeyChar) || e.KeyChar == (char)Keys.Back || e.KeyChar == (char)Keys.Space || e.KeyChar==(char)Keys.Decimal)
            {
                
                e.Handled = false;
            }
            else
            {
                // Everything that is not a Digit, nor a backspace nor a space nor a decimal will be blocked 
                e.Handled = true;
            }

Posted 11-May-12 19:42pm

Rockstar_

Comments

faezun 12-May-12 2:45am

hi. Dear
thanks
but it don't get "."

Solution 10

C#

using System.Text.RegularExpressions;


static bool AllNumeric(string inputString)
{
   return Regex.IsMatch(inputString, @"^\d+$");
}

Posted 1-Jun-13 8:28am

Yaseer Arafat

Comments

CHill60 1-Jun-13 16:30pm

It is a bit pointless adding a 10th solution to a question that is over a year old

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Wendelius · Accepted Answer · 2012-05-11T08:08:00

Solution 1

If I understood your question correctly, to get the decimal separator you can use NumberFormatInfo.NumberDecimalSeparator Property[^]

Posted 11-May-12 8:08am

Wendelius

Comments

faezun 11-May-12 14:24pm

tanks
but i have a "Decimal TextBox"

Wendelius 11-May-12 16:54pm

Do you mean that you accept only decimals? If that's the case then fetching the decimal separator and accepting that as input would be the answer as far as I understand. That's why I posted how to fetch the separator for numbers. You can use that as one acceptable input in your condition :)

faezun 12-May-12 1:01am

Honey, I want a practical solution.
How?

Maciej Los 12-May-12 5:20am

This is a practical solution. The decimal separator depends of Regional and Language option in your OS.
My 5!

Wendelius 12-May-12 5:48am

Thanks losmac :)

faezun · Accepted Answer · 2012-05-11T23:12:00

Solution 9

thanks you all friends.
:):):)
final solution:

C#

int t=0;
protected override void OnKeyPress(KeyPressEventArgs e)
{
    string s = e.KeyChar.ToString();
    if (!(e.KeyChar >= '0' && e.KeyChar <= '9' || e.KeyChar == '.' && t < 1 || char.IsControl(e.KeyChar)))
    {
        e.Handled = true;
    }
    if (e.KeyChar == '.') t++;
    base.OnKeyPress(e);
}

Posted 11-May-12 23:12pm

faezun

Comments

faezun 14-May-12 5:04am

hi friends.
a problem
if write in textBox and then delete it
textBox don't get "."
because counter t >0
how can set t=0 where textBox cleared?
:):):(