How to set min length for texbox?

Question

I want to set "Min Length" property for My TextBox in C# - WPF. In fact I have a TextBox in my window and I want to limit it to only 10 character. I set max length to 10 but I don't find min length property!

You need to write your own validation for that. http://stackoverflow.com/a/43029089/424129 — 15ee8f99-57ff-4f92-890c-b56153, Apr 03 '17 at 14:31
There is no min. Please elaborate, what are you trying to do — Gilad, Apr 03 '17 at 14:34
I want to limit my texbox to only 10 character length. not more. not fewer. only 10. — Reza.S, Apr 03 '17 at 14:41
`MaxLength` sets the visual length of the control, it has nothing to do with character count. You need to implement your own validation for the control, as Ed Plunkett suggested. — mechanic, Apr 03 '17 at 14:48
I think "Ed Plunkett" answered good. But I don't know regex's code for min length. — Reza.S, Apr 03 '17 at 14:58

score 1 · Answer 1 · answered Apr 03 '17 at 14:55

Create one property "MinLength" in your view model.

Attach a lost focus event handler to your textbox and inside it, put the check for minimum number of characters using above declared property. If textbox length is <10, then again set focus in same textbox.

Xaml:

<TextBox LostFocus="UIElement_OnLostFocus"></TextBox>

Code behind:

private void UIElement_OnLostFocus(object sender, RoutedEventArgs e)
    {
        // check condition here
    }

Federico Navarrete · Accepted Answer · 2017-04-04T07:39:38.847

0

I will suggest you something like this:

On the event Lost Focus, you handle when the user left the TextBox:

XAML:

<TextBox LostFocus="TextBox_LostFocus" />

Later with the Length property you set the minimum of characters that you expect.

C#:

private void TextBox_LostFocus(object sender, RoutedEventArgs e)
{
    if (((TextBox)sender).Text.Length < 5)
    {
        MessageBox.Show("You need to write at least 5 characters");
    }
}

This is how it should look:

edited Apr 04 '17 at 07:39

answered Apr 03 '17 at 15:01

Federico Navarrete

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You have written the same answer as that of mine. What's different in this? – Parag Apr 03 '17 at 15:27

score 0 · Answer 3 · answered Feb 21 '19 at 18:03

0

Have had the same problem and solved it this way ... Maybe it's not a nice programming style!? :)

int (name) = 0;
(name) = (textbox).TextLength;

if((name) >= (min input you like){
(do something)}

else {ErrorMessage)}

answered Feb 21 '19 at 18:03

Thomas

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How to set min length for texbox?

3 Answers3