Cannot override DBContext.Savechanges

kirsten greed

created 8 years ago

For troubleshooting purposes I wanted to put a break on DBContext.SaveChanges

Using the code I uploaded in 474659

I put inside T474565DbContext

C#
public override int SaveChanges()  
        {  
            Console.WriteLine("Saving");  
        throw new Exception("Cant save");  
            return base.SaveChanges();  
        }

I was surprised that this does not get called when I click Save Changes.

Am I missing something?

Answers approved by DevExpress Support

DevExpress Support Team

created 8 years ago (modified 8 years ago)

Hello Kirsten,
We use DBContext to create an ObjectContext instance and use it in XAF. That is why the DBContext.SaveChanges method is not invoked. See EFObjectSpace.
As far as I understand, you want to use this method to perform validation because the RuleFromBoolProperty not working approach is not working on your side.
We will research your implementation and answer you in the RuleFromBoolProperty not working thread.
Please describe your scenario in greater detail if you want to use the DBContext.SaveChanges method for another task. We will be happy to help you.

Show previous comments (7)

kirsten greed 8 years ago

I thought I could override SaveChanges because I use that technique in other non-xaf projects.
For example to implement logging, or when I am troubleshooting.
I have intentions of using it for logging down the track.

kirsten greed 8 years ago

Is there a way to override the ObjectContext.SaveChanges instead?

kirsten greed 8 years ago

I have implemented IXafEntityObject in my business objects and put a break in OnSaving. That at least gives me some idea of what is going on.

DevExpress Support Team 8 years ago

Hello Kirsten,

In most XAF application scenarios you can use XAF API, instead of accessing low-level components, such as DbContext. For instance, you can use the IObjectSpace.Committed and IObjectSpace.Committing events to write messages to the log file when the user saves changes. To handle these events, you can create a ViewController that will be activated for every View, or use the XafApplication.ObjectSpaceCreated event.

If your goal is to insert a breakpoint for debugging purposes, you can insert it directly into the method, event if you do not have the source code. To learn more about this approach, refer to the following MSDN article: How to: Set a Function Breakpoint.

kirsten greed 8 years ago

Thanks Dennis
I plan to try creating a new project and moving all my work into it. I guess I just don't feel confident when a spooky thing like an unexpected table rename happens.

kirsten greed 8 years ago

I am also thinking of moving the security business objects into my own code. Your thoughts?

kirsten greed 8 years ago

* just so I have a better feel of what is going on.

Dennis Garavsky (DevExpress) 8 years ago

OK, let us know how it all goes.
As for your new question about security, please submit a separate ticket using the https://www.devexpress.com/Support/Center/Question/Create service (because we are now far from the original topic and mixing everything here is not a good thing) and describe your reasons for this move and exactly how you want to do this, because this is not 100% clear at the moment. We will be more than happy to suggest you the best technical solutions to your issue.

kirsten greed 8 years ago

Oops, sorry Dennis, I had meant to make this comment at https://www.devexpress.com/Support/Center/Question/Details/T486359

Should I continue there , or create a new question?

Dennis Garavsky (DevExpress) 8 years ago

Yes, I would create a new ticket for your new security-related question. Thanks for your cooperation.

Created: January 23, 2017 10:40 AM

Modified: March 7, 2017 8:46 PM

Platform: App Frameworks (UI, API, ORM)

Product: XAF - Specify UI Platform

Build: 16.2.4

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Cannot override DBContext.Savechanges

Answers approved by DevExpress Support

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