GenericRepository | SEE README ) This little project contains

I am using .NET 5 and I want to run a background task using IHostedService classess as you can see:

I am trying to implement the GenericRepository pattern for a Cosmos DB Gremlin Graph API Datasource. So I have:

1. Added and verified a working Gremlin.Linq library that interfaces w/my Cosmos Graph Database.
2. Know that in the Generic Repository it implements TEntity where TEntity is a class. I have done the same.
3. I am now implementing my Generic Repository and want to use a Generic Extension with a clause for a new() so I'm getting the error. What should I do?

Error The type 'typename' must be a non-abstract type with a public parameterless constructor in order to use it as parameter 'parameter' in the generic type or method 'generic'

In ASP.NET Core-6 Entity Framework, I am using Generic Repository:

I discovered one problem while creating my project. If someone refer to the issue I will be grateful. In my project I use a layered model. The repository layer (data access layer) that communicates with the database (DB) and the service layer (business logic layer) in which services and objects are implemented (data transfer object).

As a result, there is a problem with the dbSet.Update method. When object (obj) comes into Update method as parameter, during the method call of the _db.Entry(dbSet.Local.FirstOrDefault(i => i.Id == obj.Id) ?? obj).State = EntityState.Modified or _db.Update(dbSet.Local.FirstOrDefault(i => i.Id == obj.Id) ?? obj) in the case of the first user's update (like from "view.xaml") obj is update and changes saving in the database (because dbSet.Local.FirstOrDefault(i => i.Id == obj.Id) returns null and obviously my obj gets into the _db.Update method). In case of a repeated user's update (in the "view.xaml" view) object obj -- when it gets into the _db.Update(dbSet.Local.FirstOrDefault(i => i.Id == obj.Id) ?? obj) method, it isn't take account, as the data context already tracks it and in the _db.Update method gets an object from dbSet.Local.FirstOrDefault(i => i.Id == obj.Id). Everything would be fine if this object in dbSet.Local was updated according to the type that comes from the user. However, this is not the case, it is tracked but not changed when the user edits its properties. It is not tracked properly rather due to the fact that I use services and, accordingly, data transfer object entities.

In view of the foregoing, I have a question. How to make to update entity (by a new modified object) that are tracked, or how to manually assign the necessary object in dbSet.Local to replace the one stored there? or how to make Microsoft.EntityFrameworkCore.ChangeTracking not track changes to my objects in any way?

In order to make changes not tracked I used the QueryTrackingBehavior.NoTracking parameter for the DbContextOptionsBuilder entity, but this only helps on the first load, and tracking is still used when the data is updated further. I also used the dbSet.Local.Clear() methods, but this is a bad idea, as data updating due to the deletion of the previous data from the database (like delete 20 rows from table and add one updated).

I added odata to startup and model builder and I wanted to test if it works and return an OData so I updated the controller and changed it to "ODataController" and I make a simple HttpGet test the result but the URL: Text returns 404 not found Text return 404 not found and Text return a simple Array with json objects

This is my code

Startup.cs

I can list and create records, but can't update the records. When I run my project and click the Edit button on listed records, form page appears, but if I click Submit after completing the form, I get page not found error in same URL.

I can list and create records, but can't update the records. When I run my project and click the Edit button on listed records, form page appears, but if I click Submit after completing the form, I get page not found error in same URL.

CustomerAddressModel

I created a .Net Core 5 API having 2 types of models:

• Entities (used by Entity Framework Core)
• DTOs (Data Transfer Objects for requests and responses, replacing "{Property}Id" properties from Entity with "{Property}Code" in DTO)

I have a service responsible of mapping Entities types to Dtos types added as singleton in ConfigureServices:

services.AddSingleton(typeof(IEntityDtoMappingProvider), typeof(EntityDtoMappingProvider));

The service EntityDtoMappingProvider has a method which returns the mapping between Entities and Dtos for an assembly through reflection described by this interface:

I am making an app which has two separate domains, which contain models which represent different concepts:

Now, I want to create generic repository which would allow me to make operations on data sets, and I want it to be used by both DataAccess projects, because DRY. The problem is, I would write these repositories in a way that they would use id of entity, so I need base type or at least interface which will allow me for operating on those. I would create generic repository using BaseEntity which contains ID like that:

I implemented an api and I used EF core.

I have a complex structure that its core entity is an entity that I called it Project. i should say that i used EF Core as DB First. Then I created my database at first and after that I used "Scaffold-Database" to create my Model in code.

The Project's model is: