In object-oriented programming, a mixin is a type that contains methods for use by other classes without having to be the parent class of those other classes. C# does not natively support mixins, but developers have devised various ways to mimic this functionality.

Pros:

1. Code Reusability: Mixins can encapsulate behaviour that can be reused across different classes. It promotes the DRY (Don’t Repeat Yourself) principle.

2. Code Organization: Mixins allow us to separate different functionalities into different classes, making the code easier to read and maintain.

3. Flexibility: Unlike inheritance, where a class can only inherit from a single class, a class can mix in multiple other classes, providing more flexibility.

4. Avoiding Class Explosion: In languages or scenarios where multiple inheritances are not allowed or lead to complexity, mixins can add class functionality without creating new subclasses for every possible combination of behaviours.

I want to talk about one of the most exciting new features in C# 9. A way to generate the source code you want and access it instantly in your editor. Stay tuned.

RabbitMQ is an open-source message-broker software that originally implemented the Advanced Message Queuing Protocol (AMQP) and has since been extended with a plug-in architecture to support Streaming Text Oriented Messaging Protocol, MQ Telemetry Transport, and other protocols.

A message broker acts as a middleman for various services (e.g. a web application, as in this example). They can be used to reduce loads and delivery times of web application servers by delegating tasks that would normally take up a lot of time or resources to a third party that has no other job.

RSS feeds provide an excellent mechanism for websites to publish their content for consumption by others.

ASP.NET Core supports uploading one or more files using buffered model binding for smaller files and unbuffered streaming for larger files.

Middleware is software that’s assembled into an app pipeline to handle requests and responses. Each component:

• Chooses whether to pass the request to the next component in the pipeline.
• Can perform work before and after the next component in the pipeline.

Request delegates are used to build the request pipeline. The request delegates handle each HTTP request.

Request delegates are configured using Run, Map, and Use extension methods. An individual request delegate can be specified in-line as an anonymous method (called in-line middleware), or it can be defined in a reusable class. These reusable classes and in-line anonymous methods are middleware, also called middleware components. Each middleware component in the request pipeline is responsible for invoking the next component in the pipeline or short-circuiting the pipeline. When a middleware short-circuits, it’s called a terminal middleware because it prevents further middleware from processing the request.

Controllers and Razor pages work with data that comes from HTTP requests. For example, route data may provide a record key, and posted form fields may provide values for the properties of the model. Writing code to retrieve each of these values and convert them from strings to .NET types would be tedious and error-prone. Model binding automates this process. The model binding system:

• Retrieves data from various sources such as route data, form fields, and query strings.
• Provides the data to controllers and Razor pages in method parameters and public properties.
• Converts string data to .NET types.
• Updates properties of complex types.

Caching is a technique of storing the frequently accessed/used data so that the future requests for those sets of data can be served much faster to the client.

In other terms, you take the most frequently used data, which is also least-modified, and copy it temporary storage so that it can be accessed much faster for the future calls from the client. This awesome technique can boost the performance of your application drastically by removing unnecessary and frequent requests to the data source.

It is important to note that applications should be designed in a way that they never depend directly on the cached memory. The Application should use the cache data only if it is available. If the cache data has expired or not available, the application would ideally request the original data source.

The .NET Core Feature Management libraries provide idiomatic support for implementing feature flags in a .NET or ASP.NET Core application. These libraries allow you to declaratively add feature flags to your code so that you don’t have to write all the if statements for them manually.

ASP.NET Core offers Health Checks Middleware and libraries for reporting the health of app infrastructure components.

Health checks are exposed by an app as HTTP endpoints. Health check endpoints can be configured for a variety of real-time monitoring scenarios:

• Health probes can be used by container orchestrators and load balancers to check an app’s status. For example, a container orchestrator may respond to a failing health check by halting a rolling deployment or restarting a container. A load balancer might react to an unhealthy app by routing traffic away from the failing instance to a healthy instance.
• Use of memory, disk, and other physical server resources can be monitored for healthy status.
• Health checks can test an app’s dependencies, such as databases and external service endpoints, to confirm availability and normal functioning.