IValidator and ValidationGroup

[Giorgio Parmeggiani]

Hi

I have a custom control which inherit from IValidator, ASP.NET 2.0, how can
i define a ValidationGroup for my custom WebControl? In the IValidator interface
i have not found a ValidationGroup property!

Thanks for any suggestion

Giorgio

 

[Steven Cheng[MSFT]]

Hi Giorgio,

As for the "ValidationGroup", it is a new feature added in ASP.NET 2.0, and
the IValidator interface has been defined in ASP.NET 1.X and hasn't be
modified in .net framework 2.0. However, for ASP.NET valiation controls,
they all derive from the "BaseValidator" class(abstract class which
implement the IValidator interface) , and this class has defined a public
virtual "ValidationGroup" property. Therefore, your custom validator can
derive from this abstract base class:

#BaseValidator.ValidationGroup Property
http://msdn2.microsoft.com/en-us/library/system.web.ui.webcontrols.basevalid
ator.validationgroup.aspx

Sincerely,

Steven Cheng

Microsoft MSDN Online Support Lead



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[Giorgio Parmeggiani]

Hi Steven

Thank for your reply

Unfortunately i can not derive my webcontrol from "BaseValidator" because
it inherit from "TextBox", do you think i can use some workaround to solve
my problem?

Giorgio

 

[Steven Cheng[MSFT]]

Thanks for your reply Giorgio,

After some further research, I'm afraid for developing custom Validator
control in ASP.NET, you should use the "BaseValidator" class and IValidator
interface is just a simple interface which can help you get reference to a
certain validation control and call the validation method.

I've also checked the ASP.NET page's code logic and in the Page's
server-side validation processing stage, it will get all the validators on
page through a "BaseValidator" control collection, therefore, if your
custom valicator is not derived from "BaseValidator", the page runtime will
ignore it.

====code logic from disassembled page class===
public ValidatorCollection GetValidators(string validationGroup)
{
if (validationGroup == null)
{
validationGroup = string.Empty;
}
ValidatorCollection validators = new ValidatorCollection();
if (this._validators != null)
{
for (int i = 0; i < this.Validators.Count; i++)
{
BaseValidator validator = this.Validators as BaseValidator;
if (validator != null)
{
if (string.Compare(validator.ValidationGroup,
validationGroup, StringComparison.Ordinal) == 0)
{
validators.Add(validator);
}
}
else if (validationGroup.Length == 0)
{
validators.Add(this.Validators);
}
}
}
return validators;
}
========================

Would you provide some further information on why you need to make your
custom validator inherit from TextBox? Generally validator will validate
other controls and display error info, so a Label parent class is expected.
Is there any particular requirement that you need to also input some value
for the validator control?

Please feel free to let me know your concern and we can try looking for
some other means to resolve it.

Sincerely,

Steven Cheng

Microsoft MSDN Online Support Lead


This posting is provided "AS IS" with no warranties, and confers no rights.

 

[Steven Cheng[MSFT]]

Hi Giorgio,

How are you doing on this, does the further information helps a little? Or
if you have any other concerns and requirement that we can try
investigating further? Please feel free to post here if there is anything
else we can help.


Sincerely,

Steven Cheng

Microsoft MSDN Online Support Lead


This posting is provided "AS IS" with no warranties, and confers no rights.

 

[Giorgio Parmeggiani]

Hi Steven,

Thanks for your reply, this is my problem:

I have a WebControl which imitate a TextBox (it have some functionality:
caption property, automatic decoding, etc....).
My WebControl inherit from System.Web.Controls.Control, i would validate
it using a standard validator, but, from the designer, in the "ControlToValidate"
property of standard validator i can not see my custom WebControl

So i thought to encapsulate the validation functionality into my WebControls,
but i have the problem of "IValidator" and i can not inherit from "BaseValidator"


So: I can use a standard validator to valid a control which inherit from
System.Web.Controls.Control?

Thanks in advance

Giorgio

 

[Steven Cheng[MSFT]]

Hi Giorgio,

Thanks for your reply.

Actually for developing custom webcontrol which need to be validatable by
other controls, you should use "ValidatePropertyAttribute" to specify a
property(of your custom control) which is validatable by other validators.
You can refer to the following knowledge base article for details:

#How to extend a Web form control to work with the validation controls by
using Visual C#
http://support.microsoft.com/kb/310145/en-us

Sincerely,

Steven Cheng

Microsoft MSDN Online Support Lead


This posting is provided "AS IS" with no warranties, and confers no rights.

 

[Steven Cheng[MSFT]]

Hi Giorgio,

Still any further question or does the information in last reply helps?
Please feel free to let me know if there is anything else we can help.

Sincerely,

Steven Cheng

Microsoft MSDN Online Support Lead


This posting is provided "AS IS" with no warranties, and confers no rights.

 

[Giorgio Parmeggiani]

Hi Steven

Excuse for the delay

Your suggestion has been very precious, I have understood whether to resolve
the problem

Thanks
Giorgio