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Tagged articles - ASP.NET Core

Found 56 articles tagged with ASP.NET Core

Using interceptors with dependency injection in Entity Framework Core
EF Core interceptors via dependency injection in ASP.NET 5
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I while ago I wrote an article on how to Access multiple databases from the same DbContext in EF Core which relies on interceptors to mutate the SQL query diring execution. This code works just fine and it updates the command prior to it's execution, but it lacks in option to inject registered services to it's constructor as i used new keyword to initialize class instances. Adding interceptor without dependency injection ...read more
Implementing soft delete in EF Core using triggers
Entity soft delete implementation in EF Core
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Implementation approach for soft delete is more-less straight forward thing. Instead of deleting data record, you introduce a flag which will mark the record as deleted and you can simply filter out on it and not show the data with the flag set. This way you do not loose data, but you restrict the end user to see it. This way of "deleting" data records, or better said marking them as deleted applies for certain types of applications, but sometime this requirement may come later as a new feature while the actual delete is in place...read more
Handling file upload in ASP.NET Core 5 with Swagger UI
Generating proper file upload in Swagger UI for file upload in ASP.NET Core 5
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In 2019 I worked on a REST API service which accepts files and stores them. Back then in .NET Core 2.2 I wrote custom Swagger operation filter which I described in article Handling file uploads in Swagger UI with ASP.NET Core...read more
Generic type controller methods in ASP.NET Core
Using generic type controller methods in ASP.NET Core with Swagger
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Generic types are great way to re-use methods and apply the same logic to different types. However, they come with some limitations, especially in ASP.NET realm...read more
Mocking view mapped DbSets with XUnit in EF Core
Writing unit tests for view bounded entities in EF Core
 
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Using in-memory DbContext is a great way to mock your actual DbContext in unit tests. You basically initialize the instance of your DbContext and seed some random data before you assert the result of your repository method. Now the problem occurs if you are mapping database view to an entity...read more
Setting up SQL Server IDistributedCache with migration in ASP.NET Core
Embedding SQL Server caching in a project with EFCore migration
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Caching data using Microsoft SQL Server may not be the most popular way of caching data because of the performance comparing to caching data to Redis, but it is maybe the most convenient way to keep your state of the application outside the process itself. Beside, if you are already using SQL Server database, you can just move the caching infrastructure to a separate schema inside the same database and keep using it until requirements are met for cache storage of better performance (like Redis for example). This makes infrastructure not so complex and less dependent, again until the requirements for something faster are met. ...read more
Representing available string values for parameters as list in Swagger ASP.NET Core
Valid values as list in Swagger UI in ASP.NET Core
 
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Swagger is a great way do describe your RESTful API. In ASP.NET it is pretty easy to wire up your OpenAPI documentation with your service facade with Swashbuckle NuGet package...read more
Running multiple queries at the same time in EF Core
Overcoming the limitation of EF Core query execution
 
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Since the time of ADO in .NET one of the limitations was that one connection can execute single command at the time. Same limitation Entity Framework inherited and you can execute single command at the time per instance of your DbContext. Typical dependency injection lifetime of DbContext is scoped, which means you can execute one command at the time as the DbContext is instantiated per HTTP request in ASP.NET Core application. ...read more
Accessing multiple databases from the same DbContext in EF Core
Multiple database access from the same DbContext in Entity Framework Core 5
 
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It is not uncommon to have a requirement to access tables or views in different databases in the same query. In order to be able to do your joins on tables or views in different databases you need to do it in the same connection instance which is bound to DbContext, therefore this access as to be accomplished from the same DbContext instance...read more
Seeding data in EF Core using SQL scripts
Another way of seeding data in EF Core
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Not so while ago I wrote an article on Seeding data with Entity Framework Core using migrations. This approach relies on EF Core migrations to ensure seeding of specific data is done only once using __EFMigrationsHistory table to track structural migrations as well as data seeding migrations. In large number of cases this approach works just fine and you do not need to do any adjustments or add any additional tables, just use migrations mechanism out of the box...read more
Basic authentication with Swagger and ASP.NET Core
Setting up basic authentication in ASP.NET Core Web API projects
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Basic authentication is not so popular authentication method nowadays. There is a valid reason for that and that is mainly the way credentials are used to authenticate to access the resources...read more
Seeding data with Entity Framework Core using migrations
Using EF Core migrations to seed the data
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As much as it is important for testing the functionality of the application, data seeding can also be used to pre-load some values like lookups not only to development and test environment but also to populate these values in production as well. Seeding of data can be done in several ways and in this article I will go through two ways of seeding data. Both of them have their pros and cons and it is up to you to pick the way you want to have your data pre-seeded in your application database. ...read more
Dealing with default API versions in Swagger UI
Fixing additional routes in Swagger API when using default versions
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Having your REST API versioned is important for evolving of the service over time. Especially if your service is exposed t multiple 3rd party clients...read more
Combining multiple Swagger API endpoints in a single UI
Multiple REST API microservices endpoints in a single Swagger UI
 
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Shifting from traditional monolithic application architecture to micorservices can solve bunch of problems and issues monolith application application design approach introduces, but on the other hand it has it's own drawbacks, although number of drawbacks compared to number of problems it solves is a lot greater so it makes sense to take a path in process of moving from monolithic to micorservices. On of the steps to move to micorservices is to physically have your services running as individual processes...read more
Mocking HttpClient in unit tests with Moq and Xunit when using IHttpClientFactory
Unit testing IHttpClientFactory by mocking HttpClient in .NET Core C#
 
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.NET Core has done a great job by introducing interface for most of classes which makes them easy to write unit tests around them. However, there are a lot of classes that re commonly used which are not refactored in .NET Core...read more

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