MVVM Repository Pattern in VB.net

Question

Trying to implement the repository pattern in vb.net using the following as a guide: Proper way to update records in MVVM pattern for maximum effeciency

For some reason When I run SaveCars the loop for:

    For Each changedItem As Car In _cars.GetChangedItems().Intersect(cars)
        Console.WriteLine(changedItem.Make)
    Next

Gives me nothing....

I have zipped my project here: http://dl.dropbox.com/u/4086656/RepositoryPatter.zip

Or for the code:

Model : https://gist.github.com/2065055

Repository: https://gist.github.com/2065065

ChangeTracker: https://gist.github.com/2065076

VM/View (Console): https://gist.github.com/2065097

Answer 1

Hi Omar,

I went through your code and you only need to make a slight change to make it get changed records correctly - 

Public Function IsChanged(ByVal copy As T) As Boolean
        Dim original = _originals(_copyIndex(copy))

        Return Not original.Equals(copy)
    End Function

I only had to add the word "NOT" in the return statement.

Answer 2

Right! Works - what about Overriding GetHasCode - needs to be done for sure here?

Answer 3

Hi Omar,

I'm not sure why you want to override the GetHashCode? I'm not sure what you want to achieve by it. But i think the original question has been answered. It would be fair (in my opinion) for you to close this thread and ask that question in a new thread.

Thanks.

Answer 4

Thanks Omar. That's really appreciated.