How to auto cap a textbox

How do I make it so that when a user types letters into a textbox in silverlight that it changes these letters to all capitals? And at the same time st开发者_如何学运维ill fires all the same events such as keypress.

If you want to avoid code behind or custom controls (preferable), this sort of functionality is available via behaviours.

e.g. this one in the Expression blend Gallery converts any text box to which it is attached into uppercase.

Then is just a matter of drag-drop in Blend or adding the trigger manually in VS2010.

There was no easy way to do it except to use an embedded all caps font. All other ways interfered with how the textbox worked.

The simplest way would be:

private void tb_TextChanged(object sender, TextChangedEventArgs e)
{
  var tb = (TextBox)sender;
  var caret = tb.CaretIndex;
  tb.Text = tb.Text.ToUpper();
  tb.CaretIndex = caret;
}

If you wanna save even more performance, handle the LostFocus event instead (which you then don't have to worry about carret position either):

private void tb_LostFocus(object sender, RoutedEventArgs e)
{
  var tb = (TextBox)sender;
  tb.Text = tb.Text.ToUpper();
}

But if the data is bound to a model/entity I would call the ToUpper() on the bound object property setter / OnPropertyChanged, OnTextChanged or whatever it is in the entity.