Repository pattern in MVVM - WPF

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I am using Entity Framework 6 in WPF. I have already created a Repository which returns list of entities to the Viewmodel. Since I need to bind these lists to the DataGrid, I have converted these to ObservableCollection. It needs to be done so that the change tracker of EF6 can detect the changes made, and when I call Save() on UnitOfWork, the changes are saved to the database. How can that be done?

What I have tried:

I am populating my observablecollection in ViewModel like this:

C#

ObservableCollection<items> TestCollection = new ObservableCollection<items>(UnitOfWork.Items.GetAll());

Now, if I add any item to TestCollection and then call

C#

UnitofWork.Complete()

common sense dictates that the item would not be added to the database. And of course, it isn't.

Posted 14-Mar-17 11:44am

Sabyasachi Mukherjee

Updated 14-Mar-17 14:37pm

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CHill60 14-Mar-17 18:49pm

What is your actual question? We can't provide tutorials on this forum

Sabyasachi Mukherjee 14-Mar-17 20:06pm

My actual question is "how should I keep an IEnumerable and ObservableCollection in sync?"

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Graeme_Grant · Accepted Answer · 2017-03-14T14:37:00

Solution 1

Google Search: wpf c# mvvm entity framework binding - Google Search[^] has a number of links that can answer your question regarding the DataGrid EF binding:

* Tutorial for a Basic WPF – MVVM Project Using Entity Framework - Code Project[^]

* Windows Entity Framework MVVM Walk Through 1 sample in C#, XAML for Visual Studio 2013[^]

Posted 14-Mar-17 14:37pm

Graeme_Grant

Comments

Sabyasachi Mukherjee 14-Mar-17 20:50pm

Thank you. The MSDN link was what I was looking for.

Graeme_Grant 14-Mar-17 20:53pm

You are most welcome. I find that over 90% of the time when I am stuck, someone else has already solved the problem. Google search can be your best resource tool...

Sabyasachi Mukherjee 14-Mar-17 20:59pm

Actually, none of them was exactly what I expected. I still cannot find an example of Repository pattern used with WPF. Maybe, it's because of the pitfalls of binding. Anyway, the links gave me an example of using MVVM properly, without the repository pattern.

Graeme_Grant 14-Mar-17 21:04pm

I just had another look at the Microsoft link article and it is quite detailed with downloadable code. It has all the information that you need, you only need to adapt it to your form of use - your repository pattern in this case.

CHill60 15-Mar-17 6:14am

You might also find this CP article useful:Repository pattern, done right[^]

Graeme_Grant 15-Mar-17 6:18am

Might I?

CHill60 15-Mar-17 6:21am

That was supposed to be a response to the OP's comment. It looks like it is Ok from here. Guess you were notified because it's a comment to a comment on your solution