Entity Framework Validate not changed properties RRS feed

  • Question

  • Hello.

    I start recently to use Entoty Framework v4 in one of my projects.

    Everything is ok, but now i have a problem with the validation.

    I am using with great success now the Data Annotations Attributes mechanism. The application is in Win Forms. But now I created a custom validator class that is called only when the user clicks a button for example. My problem relies on the fact that the IDataErrorInfo implementation never triggers to display to the user that the object is invalid unless he changes there that property that becomes like this invalid thorugh my custom attribute.

    I searched for 2 days now a way to programatically call the PropertyChanged events, or ReportPropertyChanged on the object but i cannot do this as i am trying to do this from outside the object, more precisely from the validator class. I tried reflection and it seemed to be a startup as i could get the event from the object. But as soon as i try to read its value, meaning to convert the Value of the PropertyChanged Event to a Multicast delegate and invoke it it returns null.

    I tried with 20 different approaches from different programming sites.


    I think i am missing something. Maybe the EF has a way to do this, or maybe it's another way to do. I dont understand why it is not easy to call the validation on all the properties when i want, not only on the changed ones.

    What's even more strange about this is that the object that i am displaying is a parent record which shows as details, and it has a child list which is displayed as grid. The bubbles from the grid are instantly displayed even if nobody else changes the values. So the question is why on the main object it does not trigger the IDataErrorInfo to update the bubbles on the form, while on the child grid it does. Also if i breakpoint after calling to my method that validates mine validators it gets all the required error messages, so the validator works as it should. It is just that it cannot display back to the user the Info Bubbles on the screen. I have errorprovider on the form, and it works ok with normal validation, like when user adds a new object, or when user invalidates by selection something there.

    Sorry for the very long explanation of my problem, and please help me if you can.

    Thank you in advance.

    • Moved by Jason Dot Wang Friday, September 7, 2012 5:36 AM This thread is about ADO.NET Entity Framework (From:Visual C# General)
    Thursday, September 6, 2012 12:54 PM

All replies

  • Hi Corsair,

      Welcome to MSDN Forum Support.

      We're doing research on this issue. It might take some time before we get back to you.


    Jason Wang 

    orichisonic http://blog.csdn.net/orichisonic If a post answers your question, please click "Mark As Answer" on that post and "Mark as Helpful".

    Friday, September 7, 2012 4:23 AM