Questions tagged [entity-framework-core]
Entity Framework (EF) Core is a lightweight, extensible, and cross-platform version of the popular Entity Framework data access technology.
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questions
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Finding items involving a particular category
I have a Item Service that is Called from an Asp.Net Core API Controller. The query gets all items in a particular category for display on an eCommerce web site (reactjs). The controller only returns ...
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Decompose URL components and store into a database
I'm writing a web crawler, and want to store the parts of a URL to a database using Entity Framework.
Instead of trying to parse a URL into its component parts myself, I thought I could inherit from ...
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2answers
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0answers
60 views
Download File Service
This is my code for download file process. The codes is working fine but would like some code review. Any comment will be appreciated especially on exception handling part. Should I just need one try ...
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1answer
91 views
How do I optimize my GetChildren method
UPDATED
I have a POCO class that is populated with _context.Categories.Load():
...
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votes
1answer
50 views
Swagger doc and Entity Framework include not working [closed]
I tried to create a .Net core API using Microsoft Documentation but I ran into some issues.
The app is working but only for a "single" table. The includes are empty.
...
1
vote
2answers
99 views
Optimizing database access using LINQ [closed]
I have the following method that I am trying to optimize. Currently, the method works great, however, it takes a little over 3 hours to complete. I feel like, using some nifty LINQ joins, it should be ...
3
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1answer
890 views
A simple method to execute Entity Framework Core queries in parallel
As you might know, EF Core does not support executing multiple queries in parallel on the same context using something like Task.WhenAll.
So you have to write this ...
1
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0answers
85 views
How to flatten the nested try-catch block in F#?
How to flatten the nested try-catch block in F# for the following code? I am using EF Core with F#. The nested is required because I need to Rollback the transaction if there are errors in saving or ...
2
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2answers
240 views
Entity Framework Core verify SaveChanges count
I am using ASP.NET Core 3.1 and have been assigned a task to verify the count of changes done using SaveChanges().
It is expected that the developer should know how ...
2
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1answer
462 views
Entity Framework Core DbFunction for square root
I'm porting my site over from .NET Framework / MVC 5 / EF6 to .NET Core 3.1 MVC / EF Core. MSSQL Server for the database.
EF6 has SqlFunctions of which one method ...
1
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1answer
38 views
Many to Many Relationship using EF Core
I've implemented Many-To-Many relationship and wonder if this is the optimal way for it. Since I do not have extensive EF Core experience I would love if someone with more experience could check it ...
6
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2answers
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ASP.NET Core 3.1 AddHttpClient call that includes a call to the database
So, I have an ASP.NET Core 3.1 web site that makes occasional calls to a vendor's RESTful API. I use the HttpClient class to perform these calls.
Currently, the ...
asked Apr 17 '20 at 16:13
EJoshuaS - Reinstate Monica
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Handling disconnected entity scenario in Entity Framework Core
As some you you may know, handling disconnected entities in EF can be a bit of a headache. After a really long weekend, I managed to make it work for my use case and refactor the code to the best of ...
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1answer
86 views
Three-way join in Entity Framework Core to retrieve all roles that a user has
I'm very new to Entity Framework Core, so I'm concerned about whether I've done this query in the most efficient way possible.
The database I'm querying looks like this:
Basically, ...
asked Mar 4 '20 at 17:50
EJoshuaS - Reinstate Monica
8551 gold badge10 silver badges25 bronze badges
6
votes
2answers
121 views
Many-To-Many movie director system
I have the following relationship in EF Core 3.1.1 (Many-To-Many):
...
1
vote
1answer
187 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 ...
5
votes
1answer
81 views
Prepare and export data to MS Word file
The task of the code that is presented for review is to prepare all the data for the export of the selected contract and create a file on this basis.
This is one of the first experiences with a ...
3
votes
1answer
306 views
Bank ATM Mockup App
This is a follow-up on bank ATM mockup app in .NET Core framework and Entity Framework Core. I have 2 user interfaces: Console and Web.
Previously I have UOW and repository layer but I have removed ...
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0answers
360 views
Bank ATM App Mockup - Implementing Domain-Driven Design (DDD)
There is a follow-up on this question.
I have created this bank ATM app mockup which I believe implement some Domain-Design Design layered architecture, repository pattern and uow pattern, if not ...
6
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2answers
261 views
Asynchronous IBAN API with validation
I am working on an iban api which is about saving the iban of some members after (iban validation) in a database. The code is split between Domain (entities, behaviour for iban validation), Database ...
4
votes
1answer
13k views
Get all children recursively in Entity Framework Core
In Entity Framework Core we can have recursive entities. But we cannot do an "Include" for these recursives (can we?). So I wrote a Get-method that does it for me:
...
2
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0answers
64 views
Querying based on condition
I am using Entity Framework Core as ORM in my ASP.NET Core 2.1 project. I want to perform server-side pagination in Career Controller for getting list of careers. I have a model which looks like:
<...
1
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0answers
80 views
Persist payload containing multiple items using EF Core Performance Improvements
I have an .NET Core EF application, setup as Database first, that is supposed to take in a payload containing items to be persisted to my database. They payloads can be huge containing multiple "...
7
votes
1answer
134 views
Retrieving the IDs of entries to be deleted from a table
Business logic
It would take us too far to explain the whole business case behind this code, so I'll try to be as succinct as possible.
There are Persons,
and ...
-1
votes
1answer
105 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. ...
4
votes
3answers
195 views
Web-app for tracking containers
Nowadays I am learning Domain Driven Design intensively. I am reading the book called Domain Driven Design by Eric Evans, and at the same time I try to apply the knowledge on a real life project I ...
8
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1answer
133 views
Shopping cart purchase method in service layer
The following is a class in the service layer of an ASP.NET Core web application, which currently contains a single method: PurchaseCart. The intention is that an ID is passed in to a "shopping cart" ...
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2answers
3k views
Is it fine to use my domain model as DTO (Entity Framework Core)? [closed]
I was reading about anemic data models and rich domain models in DDD. I don't want to follow DDD completely but take rather pragmatic approach and just take some concepts out of it because clean ddd ...
7
votes
1answer
3k views
Preventing duplicate key errors in EF-Core InMemory provider through locking
I have a rest service on Azure AD that calls other rest services. They use AzureAd authentication and AuthContext with a custom TokenCache that stores each users ...
4
votes
1answer
3k views
Linked List implementation Entity Framework Core
I am trying to create a data model where there are Document entities, which need to be in a defined order to each other. Think of an article that has sections which ...
2
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1answer
1k views
Web Service that gets data from multiple tables in a database using EF Core Database-First approach
I have never created a web service before. I followed most of this Pluralsight tutorial to give me an idea of how to create one using ASP.NET MVC along with .NET Core 2.0 and Entity Framework Core.
...
1
vote
1answer
993 views
Configuring certificate signing for development and production environments
The below code works but there's a lot of duplication I wonder if I can get around.
I would like to be able to use .AddDeveloperSigningCredential(false) if in ...
1
vote
0answers
468 views
Selecting coins with alert count by using a subquery
I have a table called alerts and is related to a table called coin (coin can have many alerts). I would like to return a list of alerts but also return a subquery count of how many alerts that coin ...
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0answers
83 views
Loop through records, change property of records, send mail for each
I am trying to basically do the following
Get record from db.
Loop through records and send mail out for each record.
Update database records.
I would like to know what is the most optimal way to do ...
3
votes
1answer
8k views
EF entity, extended with partial classes for actions
Me colleague and I recently had a discussion on good practices in EF. So I showed one of mine.
He said it is a little bit muddler.
My practice consists of modifying the autogenerated class in a ...
2
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0answers
2k views
1
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1answer
921 views
EF Core Complex Query Method
The code is returning reviews based on users like status order. It seems it executes a lot of SQL queries, so do you think it can be simplified and can it be a headache to server performance?
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0answers
389 views
ASP.NET Core basic login implementation
I'm fairly new to ASP.NET Core, I've used webforms for years so I naturally want to cling to things I did with webforms. The following code works, but I'm wondering if it can be cleaned up with ...
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0answers
668 views
BaseRepository for EntityFrameworkCode
I want to create some BaseRepository for EntityFrameworkCode and I've tried construct this Repository based on code from ...
3
votes
1answer
1k views
Enum synced with Database
Our database has several tables that have a value that can be one of 4 things, so we made these columns instead have an id column with a foreign key to an enum table with an id and a value column to ...
2
votes
1answer
317 views
Applying EF core in Universal Windows Apps using a large database
I am building my UWP app and really stuck in the architecture. For the past few days, I have been reading MVVM, Entity Framework, SQLite, Code First, etc and I am confused how I will implement ...
