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.
45 questions
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Sorting and filtering using dynamic parameters
I have this code which I am upgrading to .NET 8.
The intention is to sort and filter the resultset using the parameters. Right now it has a lot of if else and redundant code inside the blocks.
I would ...
- 155
3
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1
answer
889
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Recursively load all navigation properties of an entity
I have a table representing a class hierarchy using the TPH model.
Some of those sub classes have navigation properties (collections and/or references).
I'm trying to preload them as I know I will ...
- 195
2
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0
answers
48
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Efficient code to move a node under another while keeping all HierarchyId's as integers and sequential
I'm playing around with an app that will need to read Hierarchy trees quickly but will seldom modify them once created. I've chosen to use HierarchyIds with Entity Framework to model the hierarchy. I ...
- 21
0
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1
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624
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Mapping Entity Database Table to Model
I am not sure of the correct way to do this.
I want to separate my Entity database model from the model I use throughout my application, as it will have fields in it that I may not want added to the ...
- 103
2
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0
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4k
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Optimizing a EF Core "upsert" operation
I'm trying to "optimize" the command below. In other words, to make it suit my needs using best practices. I found a lot of posts regarding the "upsert" operation and there were a ...
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91
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EF Core code-first "many-to-many-to-many" (Books with many credits with many people)
Let's say you have a book. A book can have an author, an editor, a proof reader, or several other credits. Which credits are available should be dynamic (someone might not want to have the "proof ...
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2
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1
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2k
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.Net Core 6.0 : Entity Framework - Either Or / Neither Nor / Both in Where clause
I am building a .Net Core 6.0 application that uses Entity Framework.
I have situation where I need to apply the filter(Where clause) based on two properties (eg: Guid? skillType, string skillName). ...
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1
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Is it optimal way to filter records from table using Entity Framework?
I have the SQL Products table migrated from MongoDb and I use ASP Core + MediatR. The filtering data comes from frontend ...
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-1
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2
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158
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Using default implementations to superpower flags enums with C# [closed]
I would like to share this post with the community since at first glance it is very promising. Storing flags in the database is something that I have been interested in doing for a while since it ...
- 199
3
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2
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233
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RawSqlQuery minimizing risk of field name confusion
Is there a way to make the following code more maintainable?
...
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3
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1
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371
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EFCore Monitor Interceptor with logging queries
I created a SqlMonitorInterceptor that will check the execution time of queries and log errors. The main idea is to log queries in such a way that they can be easily copied into SQL Server Management ...
- 889
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148
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Get a list of the 25 most popular items on an E-Commerce site
I have a few lines where I am trying to get a list of the 25 most popular Items sold on an E-Commerce web site. The code works but I would like hints on how to optimize it.
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- 527
1
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2
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163
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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 ...
- 527
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2
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760
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0
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1
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158
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How do I optimize my GetChildren method
UPDATED
I have a POCO class that is populated with _context.Categories.Load():
...
- 527
-3
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1
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290
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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.
...
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1
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2
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191
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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 ...
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1
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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 ...
- 188
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2
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2k
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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 ...
- 201
2
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1
answer
1k
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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 ...
- 33
1
vote
1
answer
137
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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 ...
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2
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4k
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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 ...
1
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1
answer
991
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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, ...
5
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2
answers
187
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Many-To-Many movie director system
I have the following relationship in EF Core 3.1.1 (Many-To-Many):
...
- 192
1
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1
answer
1k
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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 seed ...
- 113
5
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1
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217
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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 ...
- 304
3
votes
1
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527
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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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6
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2
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328
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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 ...
- 1,145
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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:
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- 682
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86
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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:
<...
7
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1
answer
353
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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 ...
- 11.4k
-1
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173
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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. ...
- 101
4
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3
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322
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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 ...
- 309
8
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1
answer
230
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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" ...
- 183
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2
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4k
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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 ...
- 227
7
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1
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5k
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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 ...
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1
answer
4k
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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
votes
1
answer
1k
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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.
...
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1
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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 ...
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1
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10k
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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 ...
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0
answers
2k
views
1
vote
1
answer
1k
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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?
...
- 113
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0
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958
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BaseRepository for EntityFrameworkCode
I want to create some BaseRepository for EntityFrameworkCode and I've tried construct this Repository based on code from ...
- 111
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1
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1k
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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 ...
- 141
2
votes
1
answer
355
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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 ...
- 123