One Event for Multiple TextBoxes WPF

Question

I have multiple (> 10) TextBoxes that are used to store monetary values. As the user types, I want to format the input as a currency.

I could create one method for every TextBox but that means the creation of > 10 methods. I would rather create one method that multiple TextBoxes may use. For example:

private void OnCurrencyTextBox_PreviewTextInput(object sender, 
TextCompositionEventArgs e)
{
    CurrencyTextBox.Text = FormattedCurrency(CurrencyTextBox.Text);
}

However, this would only work for a TextBox named CurrencyTextBox. Of course there would need to be other checks for if the key is a digit etc but for the purpose of this question I am focusing on how I can apply one method to multiple TextBoxes.

Possible duplicate of How make one event handler that applies to multiple controls in C#?. You'd find it by googling for something like "same event for different controls". — Sinatr
– Sinatr, Commented Jun 30, 2017 at 9:43

Clemens · Accepted Answer · 2020-09-15 10:14:15Z

4

Cast the sender argument to TextBox:

private void OnCurrencyTextBox_PreviewTextInput(object sender,
TextCompositionEventArgs e)
{
    TextBox textBox = (TextBox)sender;
    textBox.Text = FormattedCurrency(textBox.Text);
}

You can then use the same event handler for all TextBox elements:

<TextBox x:Name="t1" PreviewTextInput="OnCurrencyTextBox_PreviewTextInput" />
<TextBox x:Name="t2" PreviewTextInput="OnCurrencyTextBox_PreviewTextInput" />
...

edited Sep 15, 2020 at 10:14

Clemens

129k13 gold badges163 silver badges296 bronze badges

answered Jun 30, 2017 at 9:27

mm8

170k10 gold badges70 silver badges102 bronze badges

Sign up to request clarification or add additional context in comments.

Comments

Sushil Mate · Accepted Answer · 2017-06-30 09:28:37Z

2

Define textbox with StringFormat=C.

<TextBox Text="{Binding Path=TextProperty, StringFormat=C}"/>

answered Jun 30, 2017 at 9:28

Sushil Mate

5836 silver badges15 bronze badges

1 Comment

Vimal CK Over a year ago

This is the best approach. and If the user want a custom format then a converter can be implemented.

Pablo notPicasso · Accepted Answer · 2017-06-30 09:27:44Z

0

sender is Control for which event is fired:

private void OnCurrencyTextBox_PreviewTextInput(object sender, 
TextCompositionEventArgs e)
{
    ((TextBox)sender).Text = FormattedCurrency(((TextBox)sender).Text);
}

answered Jun 30, 2017 at 9:27

Pablo notPicasso

3,1913 gold badges20 silver badges23 bronze badges

Collectives™ on Stack Overflow

One Event for Multiple TextBoxes WPF

3 Answers 3

Comments

1 Comment

Comments

Your Answer

Linked

Hot Network Questions

Collectives™ on Stack Overflow

3 Answers 3

Comments

1 Comment

Comments

Your Answer

Sign up or log in

Post as a guest

Linked

Related