Questions tagged [entity-framework]
The ADO.NET Entity Framework is a set of ORM (Object-Relational-Mapping) tools for the .NET Framework, since version 3.5 SP1.
391
questions
-1
votes
0answers
27 views
Entity Framework 6 using Repository and Unit Of Work Patterns
I have the following method that contains the logic for saving Nunit tests to a mysql database:
...
1
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0answers
55 views
Entity Framework optimization when using transactions
I want to save NUnit local tests in a mysql database hosted in Amazon RDS, and
I'm wrapping up everything in a transaction like so :
...
2
votes
0answers
43 views
Sharing model for different ORM's
I am building a MySQL to Realmdb converter app.
I use Entity Framework to deal with MySQL, so below is the code of one of my model classes. I don't want to have multiple classes representing the same ...
2
votes
0answers
18 views
Web API wrapper design and sharing EF database context
I'm trying to keep my sanity while working with a legacy winforms application that uses an web api, both maintained by my team.
In the past we have multiple cases of methods using wrong api endpoints,...
11
votes
3answers
13k 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.
...
9
votes
2answers
5k views
Query Builder pattern with use of FluentApi
Recently, I've come up with an idea of building a custom query builder combine with FluentApi.
Expected usage:
...
1
vote
0answers
39 views
Concurrent requests are not permitted in specific time period
In my web API, the client wants me to implement logic in order to control/block concurrent requests in a specific time period. I added RequestInterval which is 10 seconds in the appsettings of web ...
9
votes
3answers
404 views
Creating a round robin MySQL connection manager
Background
I am working on an e-commerce website, my web server is written in ASP.NET MVC (C#, EF6) and I am using 3 instances of MySQL DB. These DBs are in a cluster (Galera Cluster) and they are ...
3
votes
1answer
263 views
C# Windows Forms App: Adding An Element To The BindingSource And Save These Changes To The DB [closed]
I have build a C# Windows Forms app that used Entity Framework(DB first model). For the data I am using a .mdf database file.
The data view of dbo.students:
GUI:
The Form1 class:
...
1
vote
1answer
49 views
ASP.NET EF seed one to many relation
I am creating a simple model relation in ASP.Net core. My model relations are like this:
A user can have many posts
A post can have many comments
A user can have many comments
Now I am trying to ...
0
votes
3answers
75 views
Multiple conditions for same table in EF
I am getting products using given parameters (name of real entity and columns changed for illustration purposes),
...
1
vote
1answer
76 views
Exposing includes to client over webservice for database queries
I am using a CQRS type patter for querying data in my application. I am currently using entity framework to connect to the database.
...
1
vote
1answer
63 views
Entity Framework invoice queries
I have these queries written in Entity Framework where I try to get:
Name of the customer
Most Recent Invoice Ref
Most Recent Invoice Amount (£)
Number of outstanding invoices (#)
Total of all ...
4
votes
1answer
201 views
Initializing entity framework context in constructor
We use the architecture shown in the code below to initialize the DB context for our MVC 5 project using entity framework 6
We have the following questions related to it:
Is it safe to initialize ...
1
vote
1answer
45 views
Using nullable properties in a base class for record selection in Table per Hierarchy
I want to be able to list every Transaction associated with a Client in date order.
...
13
votes
4answers
20k views
Storing Enum values as Strings in DB
I have a Data First Migration and have been struggling a little with storing an enum value as a string.
(Im aware that enums should be stored as ints but, personally I have never liked this, yes ...
1
vote
1answer
34 views
Calculate sum of an attribute across multiple repositories
I have multiple repositories that contain userId, paidDate and amount attributes like ...
1
vote
1answer
78 views
ASP.NET MVC 5, EF 6 filter performance
I'm creating a filter with Linq in an ASP.NET MVC application. I was hoping I could get some tips on performance enhancements, aside from any possible performance enhancements.
I have a few questions:...
5
votes
1answer
4k views
Generic repository and generic service
I use the Repository/Service design pattern in my projects. I have doubts whether it is worth using common services
BaseEntity:
...
1
vote
1answer
843 views
5
votes
3answers
149 views
Collect reporting data for each possible combination of filter properties
Basically I'm looking for a way to improve my code, and avoid making a lot of if statements and parameter combination manually, 'cause I need to return a query result depending in the parameters that ...
1
vote
0answers
25 views
Console app to get XML from API and save to database
I am making a small console app to get XML from an API and then save the data to a database. While this project was not created via test-driven-development, I have tried to make it such that tests can ...
3
votes
1answer
114 views
Small application for manipulating users and their activities
I made a small application using C#, SQL Database, entity framework , and windows forms to manipulate users (...
0
votes
0answers
74 views
Entity Framework C# updating an entity list generic solution
I have an entity which has a list of other entities in it.
for example:
class Library
{
public virtual List<Book> Books{get;set;}
}
And I would like to ...
6
votes
1answer
650 views
IQueryable Extensions working on expression for collection property
Followup to Repository searching code duplication
My goal currently is to make the current implementation of my repository's IQueryable filtering less duplicative. First, I looked into passing ...
2
votes
2answers
43 views
LINQ queries to generate a report on accrued work time on projects
The following code fetches data from a MySql database to generate a simple report on accrued work time on projects.
I've been away from Entity Framework for a while and looking at this code you can ...
1
vote
1answer
73 views
Authorization using Entity Framework in ASP.NET MVC
1. Backstory
I recently starting programming and I found out that Entity Framework works perfect for my small-sized applications due its simplicity.
I've made my custom authorize attribute for MVC ...
2
votes
1answer
341 views
Generic UnitOfWork
I am trying to create a Repository & UnitOfWork for Data Access Layer. In my current implementation I have to modify my UnitOfWork everytime I create a new repository. I would like to avoid that ...
11
votes
1answer
2k views
Efficient way to deal with maintaining Many:Many relationships in EF Code-First
I've got this all working, but it seems to be quite long-winded, and I thought I'd post here and see if I'm doing it wrong...
I have a M:M relationship between an Installer and a MasterInstance. The ...
3
votes
2answers
874 views
Optimize OrderBy Generic Method
Here is my OrderBy method which includes concatenated column names.
Can this be achieved more efficiently?
...
3
votes
1answer
934 views
Dynamic AuthorizeAttribute with database
I want to create a AuthorizeAttribute that gets the current ActionMethod RouteData and ...
8
votes
1answer
3k views
GroupBy(params string[] fields)
Linq to Object GroupBy extension method allows grouping by projection:
...
-1
votes
1answer
99 views
Handling Entity Framework in connected mode within Windows Forms [closed]
I know the difference between the Entity Framework connected mode vs disconnected mode. In connected mode we do all the stuff inside one single DbContext instance. ...
1
vote
2answers
874 views
Using IQueryable.GroupBy to count related database entities
Given a DbSet<Client> from an Entity Framework 6 DbContext, I need to count the number of related ...
1
vote
1answer
58 views
Repository to update flights
I have the Repository below, but I have noticed that there is a recurrent pattern try / catch which does not seem to be that ...
1
vote
0answers
2k views
Transaction integrity in asp.net core with entity framework and generic repository
I am not very experienced in Entity Framework, I previously used ADO.Net and Dapper for data persistence. For now, I only read Microsoft docs and watched a few video tutorials. I tried to stick to ...
5
votes
2answers
40k views
Class to DataTable or Datatable to class mapper
My code goes from a class to DataTable, and back again. It populates the class's public properties, or creates DataColumns whose ...
2
votes
0answers
2k views
Using Entity Framework to Call an Oracle Stored Procedure with Multiple Cursors
I wrote the following code to use Entity Framework 6 and Managed Oracle Providers to call an Oracle stored procedure that returns multiple cursors.
Would like some input about the code I used to ...
1
vote
1answer
19k views
Entity Framework - Add or Update Parent Entity with Children
This code saves an DomainEntityRecord (parent) and DomainEntityDetailRecords (child), and it works. It feels odd that I get the ...
2
votes
1answer
1k views
Navigation properties with sql/dapper
I want to have the same experiance with slq/dapper for my navigation properties just like in Entity Framework.
But I'm not sure which sql query i should use.
As you see, every single Resource entity ...
5
votes
2answers
10k views
Proper way to work with stored procedures in Entity Framework Core
I need to work with stored procedures, with the help of Entity Framework Core. This is my function:
...
8
votes
1answer
12k views
MVC 5 & EF 6 - Repository & Unit of Work Pattern
I have been looking through Code Review on the subject of Unit of Work and Repository patterns and realised that my implementation appears to provide very similar functionality but in reverse class ...
3
votes
1answer
55 views
Registering an event participant, using Entity Framework and several associated models
I have a method that is responsible for receiving an object and perform the information saved with Entity Framwork, using the Repository pattern. The issue is that this object is, basically, a DTO. ...
9
votes
4answers
21k 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
...
5
votes
2answers
4k views
Repository pattern along with EF and Unit of work
I'm new to this Repository pattern and have seen lot of repository pattern + UoW implementations all over the internet and I'm not able to reach to a conclusion as to which of them is correct . After ...
3
votes
1answer
5k views
Injecting a DbContext with an async constructor dependency
The goal is to construct a DbContext with a connection that uses an access token. The access token is acquired with ADAL (Active Directory Authentication Library).
...
2
votes
0answers
124 views
How to optimize code to only pull separate table rows that are necessary
I have a Company Class, and separate normalized Address Class. I did this because the Address table will hold more than just Company Addresses, so I don't want "CompanyAddress", "EmployeeAddress", "...
2
votes
1answer
3k views
Adding or updating Company entity
Here I am trying to post a company view-model and update and insert according. But I feel I am writing it in wrong way or maybe there's a better approach.
Here's my code
...
0
votes
1answer
247 views
Filtering DbContext data dynamically by user input in WPF applications
I need to filter database data based on filters available to the end user in the form of search term text box, select boxes etc.
I have put together this code and need feedback if this is a good way ...
2
votes
0answers
43 views
Correct Way to Retrieve Header Records With Filtered Detail Records [closed]
I wrote this in LinqPad. It works. The whole point was to retrieve header records, and only include some detail records. I'm looking for possible improvements to this, specifically around the ...
