Intercept "Value cannot be converted" in code

[Ivan]

Hi, I have RadPropertyGrid with auto generated property definitions. Some of the properties are numeric, and when something like letters is input in those properties, I get 'Value cannot be converted.." message.

So this is a settings form, and I should be able to forbid saving those properties if such conversion issue exists, but how can I check that on code side?

[Ivan]

Anyone? I just need to check if RadPropertyGrid has any conversion errors/warnings

[Vladimir Stoyanov]

Hello Ivan,

The 'Value cannot be converted.." message that you are observing is due to RadPropertyGrid's validation mechanism. For more information on the matter, you can take a look at the Validation article in our documentation and the Validation SDK example. Additionally you can use the Validation.Error attached event which is raised when a validation error is thrown. 

I hope this helps. Let me know if you have any further questions.

Regards,
Vladimir Stoyanov
Progress Telerik

[Ivan]

Hi Vladimir,

I have looked into telerik validation. The deal is that I don't have any validations assigned to my class. So I believe this "value cannot be converted" message comes from propertygrid.

[Vladimir Stoyanov]

Hello Ivan,

The validation message can also be shown if you are trying to enter a value that cannot be saved in the target property(for example if you are trying to enter a string into an integer field). What I can suggest in order to intercept that validation is to subscribe to the Validating event which is raised when you commit a PropertyGridField and RadPropertyGrid's EditMode is Single. I am attaching a sample project demonstrating this for your reference.  

Regards,
Vladimir Stoyanov
Progress Telerik

[Ivan]

Hi Vladimir,

seems that approach works.

But this makes some unwelcome changes in RadPropertyGrid looks -

1. Instead of checkbox for bool fields we have text field with True/False

2. Instead of description attribute of Enum it show string representation of it.

Is it possible to address that, or it is the default behavior of RadPropertyGrid  ?

[Vladimir Stoyanov]

Hello Ivan,

This is the expected behavior. Since the EditMode is single, only one property can be edited at a time. All of the other properties are displayed in TextBlocks. You can read some more about that in the EditModes article in our documentation. 

Regards,
Vladimir Stoyanov
Progress Telerik