The ADO.NET Entity Framework is a set of ORM (Object-Relational-Mapping) tools for the .NET Framework, since version 3.5 SP1.
1
vote
0answers
14 views
Metadata query performance optimization
SQL Server 2008 R2 + .NET 4.5:
I have the following metadata table:
CREATE TABLE [dbo].[Metadata](
[Id] [uniqueidentifier] NOT NULL,
[ContentId] [uniqueidentifier] NOT NULL,
...
0
votes
0answers
32 views
What the best way to wire up Entity Framework database context (model) to ViewModel in MVVM WPF? [migrated]
As in the question above: What the best way to wire up Entity Framework database model (context) to viewModel in MVVM (WPF)?
I am learning MVVM pattern in WPF, alot of examples shows how to implement ...
2
votes
1answer
63 views
Enabling discard pending changes on DbContext
This code review request is tightly coupled with this SO question, this is the solution I implemented to solve the problem being asked about there.
All my ViewModels get constructor-injected with a ...
1
vote
0answers
58 views
Entity Framework using Repository Pattern, Unit of Work and Unity - viable approach?
Using a combination provided from this example and this implementation, I'm creating a solution that decouples the UnitOfWork class from the individual repositories, as they violate the Open-Closed ...
1
vote
1answer
113 views
Unit of Work and Repository Design Pattern Implementation
User and Role are just examples; also, code is sparse on purpose (i.e. for demonstration purposes only).
Thoughts? (e.g. good, bad, etc.)
Interfaces
public interface IEntity
{
int Id { get; }
}
...
1
vote
1answer
43 views
Creating models manually in mvc
I am creating my models manually.
I have five tables in my database as follows :
1. Members
2. MemberTypeMasters
3. Payments
4. Relationships
5. StatusMasters
My Database looks like :
So far I ...
0
votes
1answer
95 views
Serialize the properties of an entity framework entity to data fields and back
I am trying to write code to convert properties of an Entity Framework entity to strings and back.
Here is the code so far that converts back from strings to the object properties.
I am stuck trying ...
1
vote
0answers
36 views
Review WCF client class
Please review, the class is responsible for wrapping requests to a WCF Data Service, which tidies up calling code. Transactions are implicitly supported. It should efficiently send just updates to the ...
2
votes
1answer
120 views
When to use separate DBContext classes?
I know that the DBContext represents a session (Unit-Of-Work and Repository) with the database, however I an unsure as to when I should have a different DBContext. Currently, I have a separate ...
1
vote
2answers
103 views
MVC Layered Project Structure
We are starting a new web project using C# / MVC 4 and Entity Framework 5 for data access. I've decided to go with an n-layered approach for the structure of the project and I would like some feedback ...
4
votes
1answer
108 views
DbSet<T> IncludeAll method
The Problem
As an ASP.NET MVC4 developper, I'm using Entity Framework a lot. Considering performance I often use lazy loading for my models.
public class Result {
public int Id { get; set; }
...
0
votes
3answers
47 views
Best Practice - Passing by Entity or EntityId in repositories?
Which is the best practice in getting data from repository? passing just by object or by Id?
public IQueryable<Attendance> GetByPersonId(int id)
{
return DbSet.Where(ps => ...
5
votes
1answer
110 views
Can this ordering logic be done better?
I am creating an ASP.NET MVC 4 app using Entity Framework and currently I am creating orderable tables. For that I have created the following logic to handle the different orders:
if (orderKey == ...
-1
votes
2answers
68 views
How does this GetType() work? [closed]
I thought .GetType() was a method that had to be used like myProperty.GetType(). But, as you can see, it is being used simply by itself:
(from p in GetType().GetProperties(BindingFlags.Instance | ...
1
vote
1answer
185 views
Review Repository and UnitOfWork implementation
I've done a LOT of reading about creating a Unit Of Work and Repository based implementation for my Entity Framework based application. I have come up with the following - what problems can you find?
...
2
votes
1answer
100 views
How can I make this code better
I hate having almost two identical blocks do almost the exact same thing.
I am working with Entity Framework 4.4.0.0
Asp.Net MVC
Right now if the user is a "manager" I want to show them the entire ...
1
vote
1answer
228 views
Updating entities with EF (Delete, Add, Update) with one method
I have a WCF service, which has a method for updating a EF entity. The update method works just fine but looks ugly. I think due to some EF design I have to manually set the change tracker state to ...
1
vote
1answer
84 views
Making a property virtual to cause EF to load the property?
I am walking through a sample MVC4 ASP.Net tutorial available on PluralSight.com, by Scott Allen. I am in a section #5, Working with Data (part 2), "Listing Reviews".
This application has a database ...
2
votes
3answers
726 views
Using Linq to select the first and last values
I want to get just the first and last values in a date range. I have the following code:
using (var myEntities = new dataEntities())
{
var myValues = (from values in myEntities.PointValues
...
2
votes
1answer
155 views
Feedback and Advice on my N-Tier Application Architecture
I am working on an application that will use an N-Tiered approach. I would appreciate any feedback and advice on my architecture before I proceed any further.
DataLayer (Class Library Project)
...
2
votes
0answers
77 views
Repository pattern and unit of work
I implement 2 distinct class from an repository interface
public interface IRepository<T>
{
bool TryGet(Func<T, bool> predicate, out T entity);
T Get(Func<T, bool> ...
0
votes
0answers
41 views
Abstract repository for entity framwork
I write abstract repository
using System;
using System.Collections.Generic;
using System.Data;
using System.Data.Entity;
using System.Linq;
using System.Linq.Expressions;
namespace ...
3
votes
2answers
108 views
Refactoring from .. in .. select to more compact one
Is it possible to write the two following lines of code in a more compact one?
IEnumerable<int> collection = from partnerNumbers in contract.Contact.PartnerNumbers select partnerNumbers.Pnr;
...
1
vote
2answers
111 views
How to optimize/refactor this method?
Here is my method:
public JsonResult ValidateAll(string toys)
{
Dictionary<string, object> res = new Dictionary<string, object>();
List<string> result_check = new ...
1
vote
1answer
174 views
How can I implement the generic repository pattern and improve the performance for the code below?
I've used EF-DB first approach and have written a simple app to retrieve the data from the database and show it in the view. The code is simple and ok for a beginner like me, but how can I implement ...
4
votes
1answer
1k views
Looping through columns in Entity Framework
Is there a cleaner/more efficient way to loop through the columns in EF implicitly than the way written below?
static void Main(string[] args) {
using (var db = new someDbContext()) {
var ...
3
votes
2answers
202 views
Code-First TPT, TPC, or incorrect inheritance?
My question is: based on the business need below, should I use Table-Per-Type, Table-Per-Class/Concrete-Type, or am I misusing inheritance in the first place? If TPT, will the query performance ...
2
votes
2answers
78 views
Optimizing a distinction code
List<int> types = new List<int>();
foreach (var d in myTableList)
{
if (!types.Contains((int)d.item_type))
types.Add((int)d.item_type);
}
I have a table in db called myTable. ...
3
votes
1answer
117 views
Optimization of code for searching in db
This is my code:
var test = (from x in myDb.myTable
where (x.name == tmp || x.name == tmp2 || x.name == tmp3) && x.unit == u
select x).FirstOrDefault();
if (test == ...
1
vote
0answers
57 views
AlwaysUpdate attribute for Entity Framework Code First POCO
The entity framework will only save properties it detects has changed via its proxy classes. I have a situation where I want a property to always be saved no matter if it changed or not.
I wrote a ...
1
vote
1answer
2k views
Entity Framework & Unit Of Work Design issue with Repository & DI, Please Help
I am facing a problem to save data using UnitOfWork. I mean I am unable to save data using UnitOFWork.Commit() from Controller class. My Implementation check bellow.
IUnitOfWork
public interface ...
1
vote
2answers
116 views
Is my code (clean code separation) is correct?
The code below is an approach of clean code separation, but I am confused if it is a right approach or wrong. Please suggest me.
public interface IRepository<T>
{
...
3
votes
0answers
1k views
Correct usage of EF's DBContext in ASP.NET MVC application with Castle Windsor
I am trying to use Entity Framework as simple as posible. Use UnitOfWork and Repository patterns seems to be overkill because whole web application will be pretty straightforward. I came with this ...
1
vote
1answer
127 views
Passing an entity to use it's fields to update method is ok to do?
I have two different ideas on how to handle this Update method in my MVC Model class "DataAccess" And I'm wondering if in the first, I'm handling my class incorrectly or ambiguously, because I'm using ...
0
votes
1answer
129 views
Products table or Products + attributes when using EF + MVC 4 [closed]
What I need to build is a web application that maintains and shows products. A product has a lot of attributes, some that will be changed or added during the next year. I have 2 options for designing ...
4
votes
4answers
425 views
Is this bad code? (Instantiating if null)
I often have static classes which uses the DataContext somehow, and they all make a new DataContext, but often i allready have one instantiated elsewhere, so why not use that?. And then i would do ...
2
votes
0answers
68 views
Does my design follow the single responsibility principle
I'm working on a site that has to do with movies. I am consuming the Rotten Tomatoes API to get my movie information and using EF5 with a code first approach to get that into the database. I'm using ...
10
votes
2answers
19k views
Entity Framework Generic Repository Pattern
Thought 1
public interface IRepository<T> : IDisposable where T : class
{
IQueryable<T> Fetch();
IEnumerable<T> GetAll();
...
4
votes
2answers
393 views
Trying to clearly seperate my logic in my program
My problem is I need to know
is my code in my CRUD functions structured well and effectively? I plan to implement CRUD for Locations entity too. hopefully without redundant code.
you see how one ...
0
votes
1answer
172 views
Making a Custom class less specialized but just as understandable?
In my C# program, I have a class defined as follows:
public class DbResult
{
public bool bSuccess { get; private set; }
public String Message { get; private set; }
private DbResult(bool ...
1
vote
1answer
235 views
Am I using too many functions in my DataAccess Class?
I am wondering if in particular the function called AssignDBStatusMessage and TryDataBaseAction are unnecessary. It seems to me that the logic is more cluttered if i do away with those functions. ...
6
votes
1answer
1k views
ListBox for a many to many relationship
I'm looking for a good and easy to use solution for creating MultiSelectLists in MVC for many to many relationships.
I have this following example code and it works fine, but it just takes a lot of ...
1
vote
2answers
289 views
How to organize this code and prepare more versatile CRUD functions?
I am using C# and the .net entity framework, and I'm also learning how to better use OOP concepts in my program. My code is all displayed below. I would like to ensure my logic is properly organized ...
0
votes
2answers
285 views
using 2D array to read datatable ok? or repeatedly call function that reads record by record?
I am asking this for coding style. I have a program class that calls a function(of a data access class) that reads from a table (using entity framework by the way), and I'm preparing to write the ...
6
votes
1answer
303 views
combining 4 CRUD functions into 1?
I have a console application that I'm trying to make with minimal redundant code.
I have 4 functions, Create, Read, Update, and Delete.
is it possible or practical to combine the four functions ...
6
votes
2answers
208 views
How to reduce my code length without changing concept?
There are three servers. I want to assign a job to a server which has least NotStarted jobs. I have achieved this, but my code is very lengthy. I don't know how to minimize my code without changing my ...
4
votes
0answers
381 views
Multiple repository calls or LINQ query
These two methods do the exact same thing (or at least they are supposed to!). They both pass a simple test based on a mock context. Neither has been exposed to any integrated testing yet.
Would ...
4
votes
2answers
1k views
Threadsafe DBContext in singleton
I found out the hardway that access to DbContext in .NET is not threadsafe. I have a singleton for logging things using a dbcontext. The original version uses something like
public Logger{
private ...
9
votes
2answers
4k views
Generic repository and unit of work code
I am writing a WPF application that needs to access information from a database (I am currently using Entity Framework code first, so data access is via DbContext).
My ViewModels directly ...
1
vote
1answer
214 views
Is it proper TPT Inheritance
I have following model and database created using Entity Framework. Is it proper TPT Inheritance?
Is it possible to make the base class as abstract?
Model
Database
CODE
namespace LijosEF
{
...
