Using custom Validator server controls

Question

I need to write use a custom validator to check to see if a textbox has a number with a decimal for instance 95.3 in it. What is the expression to accomplish in validator server controls in asp.net?

Answer 1

Not sure if this is exactly what you're looking for, but there's this post I've seen a long time ago which kinda explains how to do it. You might wanna take a look: http://aspdotnet-sequel.blogspot.com/2009/05/aspnet-textbox-validate-integer-float.html

Answer 2

Something like this should work, you can modifiy to allow as many decimal places you need or want:

\d{0,}.\d{0,2}

Assuming you are speaking about regular expressions. But if you were you should use a regular expression validator instead of a custom one.

Also, here is a link to another question that is very similar. link

Answer 3

In the validator_ServerValidate event you can do this:

Protected Sub CustomValidator1_ServerValidate(ByVal source As Object, ByVal args As System.Web.UI.WebControls.ServerValidateEventArgs) Handles CustomValidator1.ServerValidate
    If args.Value.Contains(".") Then
        '*** Textbox has a decimal...do what you need to handle it  ***'

    End If
End Sub

But as others mention, without knowing a bit more about what exactly you need to have happen, you would probably want to look at either a Regular Expression validator and try to validate on the client-side instead of server-side (unless you need to have it happen on the postback)

Answer 4

Please try the following:

float f;
bool isFloat =float.TryParse("a.0", out f); //Will return false

bool isFloat2 =float.TryParse("95.3", out f); //will return true

Good luck!