CODEWITHSUNDEEP
c#wpfevents
nikolifish
nikolifish

Reputation: 512

Controlling Multiple Text Boxes with same event Type

I have a C# WPF Window in which I have 20 textboxes. They don't do anything special, and all i want is when I went them for the text to be selected.

I know it's fairly each to set up 20 events like

private void customerTextBox_GotFocus(object sender, RoutedEventArgs e)
{
    customerTextBox.SelectAll();
}

but i'm wondering if theres something smoother like

private void (genericTextBox)_GotFocus(object sender, RoutedEventArgs e)
{
    (genericTextBox).SelectAll();
}

where I can just use this once and each textbox understands to user that event

Upvotes: 0

Views: 2592

Answers (5)

Stephen
Stephen

Reputation: 509

In addition to creating the generic handler as aforementioned, you can also add a line of code to your window's constructor so you do not have to attach the handler in xaml to each textbox.

this.AddHandler(TextBox.GotFocusEvent, new RoutedEventHandler(TextBox_GotFocus));

Upvotes: 0

koshdim
koshdim

Reputation: 206

you can use RegisterClassHandler method like this:

 EventManager.RegisterClassHandler(typeof(YourClass), TextBox.GotFocusEvent, new RoutedEventHandler((s, e) =>
        {(s as TextBox).SelectAll();};

Upvotes: 0

Steve Wong
Steve Wong

Reputation: 2256

You can use the "sender" parameter to write one handler for multiple TextBoxes.
Example:

private void textBox_GotFocus(object sender, RoutedEventArgs e)
{
    TextBox textBox = sender as TextBox;
    if (sender == null)
    {
       return;
    }
    textBox.SelectAll();
 }

Upvotes: 2

Damir Arh
Damir Arh

Reputation: 17855

You can use sender argument which contains the reference to the textbox that raised the event:

private void GenericTextBox_GotFocus(object sender, RoutedEventArgs e)
{
    (sender as TextBox).SelectAll();
}

You can then set this error handler for all your textboxes:

<TextBox x:Name="textBox1" GotFocus="GenericTextBox_GotFocus" />
<TextBox x:Name="textBox2" GotFocus="GenericTextBox_GotFocus" />
<TextBox x:Name="textBox3" GotFocus="GenericTextBox_GotFocus" />
<TextBox x:Name="textBox4" GotFocus="GenericTextBox_GotFocus" />

Upvotes: 2

Jed
Jed

Reputation: 10877

Create your event handler as you did in your example and then point all your textbox's GotFocus event to that handler.

Upvotes: 0

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