How to invoke an event in every textbox in the project.

Question

1.00/5 (2 votes)

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What I really want is to call the Enter and Leave event of all the textBox's project, without me having to set this textbox event by textbox.

I created a keyboard and I want it to open whenever the user wants to type something (Enter event), and close the keyboard when the textBox loses focus.

The challenge was launched, come on guys !!!!

What I have tried:

I've tried putting invoke the keyboard textbox by textbox, but this is not very productive for me, because the project is too granda to do this.

Posted 16-May-18 2:36am

Ayrton Yagami

Updated 16-May-18 3:43am

Chris Maunder772.9K

v2

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Comments

BillWoodruff 16-May-18 13:46pm

"the project is too granda "

does this mean that you need to find all TextBoxes on all open Forms at run-time ? More than one Form ?

2 solutions

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APE-Germany · Accepted Answer · 2018-05-16T03:00:00

Solution 2

public Form1()
 {
     InitializeComponent();
     RegisterTextBoxEvent(this);
 }


 private void RegisterTextBoxEvent(Control baseCtrl)
 {
     foreach(Control ctrl in baseCtrl.Controls)
     {
         if(ctrl.GetType() == typeof(TextBox))
         {
             ((TextBox)ctrl).Enter += MyEnterEvent;
         }

         RegisterTextBoxEvent(ctrl);
     }
 }

 private void MyEnterEvent(object sender, EventArgs e)
 {
     Console.WriteLine(((TextBox)sender).Name);
 }

Posted 16-May-18 3:00am

APE-Germany

Comments

Richard Deeming 17-May-18 12:34pm

if(ctrl.GetType() == typeof(TextBox))

It would probably be better to use the as operator[^] here:

TextBox txt = ctrl as TextBox;
if (txt != null)
{
    txt.Enter += MyEnterEvent;
}

Or, if you're using an up-to-date compiler, use pattern matching[^]:

if (ctrl is TextBox txt)
{
    txt.Enter += MyEnterEvent;
}

APE-Germany · Accepted Answer · 2018-05-16T02:51:00

Solution 1

You can do a foreach loop on the controls. A recursive function that registers every textbox to the event.

Posted 16-May-18 2:51am

APE-Germany