Veeam® is happy to provide the Microsoft community with a study guide prepared by MVP and MCT, Orin Thomas. This guide will take you through each of the exam objectives, helping you to prepare for and pass the examination.
Course Of The Month
3 days, 13 hours left to enrollBecome a Premium Member and unlock a new, free course in leading technologies each month.
Solved
MVVM EntityFramework 4.1 Master-Details. How can i update an ObservableCollection<T> when T is saved using EF and Repository+UOW
Posted on 2013-01-02
I have a View that has a listbox whose ItemsSource is an ObservableCollection<T>.
T is a ViewModel (called PersonViewModel) wrapping a poco class (called Person). The PersonViewModel has a SaveCommand and Validation code.
The ListBox selected item is used as the Datacontext for a details view.
The details view shows the single (selected) PersonViewModel and uses the SaveCommand to save any changes, made in the details view, to the wrapped person poco.
The Save command will save the data to SqlServer database using repository Insert, and saving changes the entitys state from Modified to Unchanged.
This doesn't seem to update the ObservableCollection because when I press the Save button again, the entity can be saved again (because its state in the ObservableCollection remains as Modified).
Can you give me any pointers re how to keep the state of ObservableCollection of Person entities synchronized with what the Context thinks is happening.
T is a ViewModel (called PersonViewModel) wrapping a poco class (called Person). The PersonViewModel has a SaveCommand and Validation code.
The ListBox selected item is used as the Datacontext for a details view.
The details view shows the single (selected) PersonViewModel and uses the SaveCommand to save any changes, made in the details view, to the wrapped person poco.
The Save command will save the data to SqlServer database using repository Insert, and saving changes the entitys state from Modified to Unchanged.
This doesn't seem to update the ObservableCollection because when I press the Save button again, the entity can be saved again (because its state in the ObservableCollection remains as Modified).
Can you give me any pointers re how to keep the state of ObservableCollection of Person entities synchronized with what the Context thinks is happening.
[X]
Welcome to Experts Exchange
Add your voice to the tech community where 5M+ people just like you are talking about what matters.
- Help others & share knowledge
- Earn cash & points
- Learn & ask questions
Featured Post
Question has a verified solution.
If you are experiencing a similar issue, please ask a related question
For most people, the WrapPanel seems like a magic when they switch from WinForms to WPF. Most of us will think that the code that is used to write a control like that would be difficult. However, most of the work is done by the WPF engine, and the W…
Entity Framework is a powerful tool to help you interact with the DataBase but still doesn't help much when we have a Stored Procedure that returns more than one resultset. The solution takes some of out-of-the-box thinking; read on!
This is Part 3 in a 3-part series on Experts Exchange to discuss error handling in VBA code written for Excel.
Part 1 of this series discussed basic error handling code using VBA.
http://www.experts-exchange.com/videos/1478/Excel-Error-Handlin…
This is my first video review of Microsoft Bookings, I will be doing a part two with a bit more information, but wanted to get this out to you folks.
Suggested Courses
Earn Certification
HTML5 Specialist - Certification
Free withPremium
Course of the Month3 days, 13 hours left to enroll
Earn Certification
Administering Microsoft SQL Server 2012 Databases (Exam 70-462)
$79.00$71.10
630 members asked questions and received personalized solutions in the past 7 days.
Join the community of 500,000 technology professionals and ask your questions.