Foreach Control in form, how can I do something to all the TextBoxes in my Form?

Question

How can I use a Foreach Statement to do something to my TextBoxes?

foreach (Control X in this.Controls)
{
    Check if the controls is a TextBox, if it is de         


        

Answer 1

You can do the following:

foreach (Control X in this.Controls)
{
    TextBox tb = X as TextBox;
    if (tb != null)
    {
        string text = tb.Text;
        // Do something to text...
        tb.Text = string.Empty; // Clears it out...
    }
}

Answer 2

Even better, you can encapsule this to clear any type of controls you want in one method, like this:

public static void EstadoControles<T>(object control, bool estado, bool limpiar = false) where T : Control
        {
            foreach (var textEdits in ((T)control).Controls.OfType<TextEdit>()) textEdits.Enabled = estado;
            foreach (var textLookUpEdits in ((T)control).Controls.OfType<LookUpEdit>()) textLookUpEdits.Enabled = estado;

            if (!limpiar) return;
            {
                foreach (var textEdits in ((T)control).Controls.OfType<TextEdit>()) textEdits.Text = string.Empty;
                foreach (var textLookUpEdits in ((T)control).Controls.OfType<LookUpEdit>()) textLookUpEdits.EditValue = @"-1";
            }
        }

Answer 3

If you are using C# 3.0 or higher you can do the following

foreach ( TextBox tb in this.Controls.OfType<TextBox>()) {
  ..
}

Without C# 3.0 you can do the following

foreach ( Control c in this.Controls ) {
  TextBox tb = c as TextBox;
  if ( null != tb ) {
    ...
  }
}

Or even better, write OfType in C# 2.0.

public static IEnumerable<T> OfType<T>(IEnumerable e) where T : class { 
  foreach ( object cur in e ) {
    T val = cur as T;
    if ( val != null ) {
      yield return val;
    }
  }
}

foreach ( TextBox tb in OfType<TextBox>(this.Controls)) {
  ..
}

Answer 4

Check this:

foreach (Control x in this.Controls)
{
    if (x is TextBox)
    {
        x.Text = "";
    }
}

Answer 5

foreach (Control X in this.Controls)
{
  if (X is TextBox)
  {
    (X as TextBox).Text = string.Empty;
  }
}

Answer 6

simple using linq, change as you see fit for whatever control your dealing with.

        private void DisableButtons()
    {
        foreach (var ctl in Controls.OfType<Button>())
        {
            ctl.Enabled = false;
        }
    }

    private void EnableButtons()
    {
        foreach (var ctl in Controls.OfType<Button>())
        {
            ctl.Enabled = true;
        }
    }