Question

What I am trying to do when the user is in a textbox (in silverlight 2.0):

• When user presses the decimal point (.) on the numeric pad, I want to have it replaced by the correct decimal separator (which is comma (,) in a lot of countries)

I can track that the user typed a decimal point by checking in the keydown event

void Cell_KeyDown(object sender, KeyEventArgs e) {      if (e.Key == Key.Decimal) 

But how do I replace that key with an other in Silverlight. The e.Key is read only. Is there a way to ‘send an other key’ to the control? Or any other suggestions?

Answer 1

Using Alterlife’s answer as a hint for replacing contents, I have the following working hack… But I don’t like it :-(.

• It means that the Text property is set twice, once to the wrong value and then replaced by the right value
• It only works for text boxes
• It feels like a hack that someday might just stop working

So suggestions for better, more generic, solutions are very welcome!

The hack:

    void CellText_KeyUp(object sender, KeyEventArgs e)     {         var DecSep = System.Threading.Thread.CurrentThread.CurrentCulture.NumberFormat.NumberDecimalSeparator;          if (e.Key == Key.Decimal && DecSep != '.')         {             if (e.OriginalSource is TextBox)             {                 var TB = (TextBox)e.OriginalSource;                 string sText = TB.Text;                  int iPos = TB.SelectionStart - 1;                 if (iPos >= 0)                 {                     System.Diagnostics.Debug.Assert(sText.Substring(iPos, 1) == '.');                      TB.Text = sText.Substring(0, iPos) + DecSep + sText.Substring(iPos + 1);                     TB.SelectionStart = iPos + 1; // reposition cursor                 }             }         }     }