How do I bind text to a boolean

Question

My code is:

private static boolean isInt(String s)
 {
     try{
         Integer.parseInt(s);
         return true;
        }
        catch(NumberFormatException e){
            return false;
        }

 

Is it possible to make it say something like "when X  is not an integer write: X has to be added as numbers" or something like that?

Answer 1

What are you trying to do?  Are you wanting to data bind some text to one of two messages, depending on whether something represents a number or not?  You could just implement a method on your object that returns the desired text and then bind to that.

In a broader context, if you're trying to tell a user that they've entered text, where a number is expected, you can leverage support for data validation in WPF.  You can use an ExceptionValidationRule to catch exceptions that occur when you try to assign a text value to a numeric property.

See http://blogs.msdn.com/b/wpfsdk/archive/2007/10/02/data-validation-in-3-5.aspx a good explanation of data validation.

Answer 2

I don't understand what are you trying to do 

Answer 3

Hi MrsNoob,

I think Sean's suggestion is a prefered way to accomplish this.

And I think an IValueConverter is the answer to your original question. It's possible to use converter to converte a bool value to different string in a binding. See here for more information.

If you still have any questions or concerns about this issue, please feel free to let me know.

---

Min Zhu [MSFT]
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