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Using DisplayName attribute for model validation output in ASP.NET MVC Core

Returning DisplayName attribute value in model validation response in MVC Core
Model validation is an important part of request life-cycle and pipeline in MVC Core regardless whether you are building Web API project or ASP.NET MVC web application. Both project templates rely on the common ASP.NET Core platform therefore validation is pretty much the same in both type of projects. Because Web API and micro services are more popular nowadays, I am going to use Web API sample project to demonstrate how to modify validation response in MVC Web API Core project. ...read more

Dependency injection with custom MVC filter attributes in ASP.NET Core

Using dependency injection with custom ExceptionFilterAttribute in ASP.NET Core
Apart from adding your own middleware to the ASP.NET MVC Core application pipeline, you can control the response using custom MVC filter attributes and selectively apply them to either whole controller or controller actions. One of the commonly used MVC filter in ASP.NET Core is ExceptionFilterAttribute for handling error response in Wep API applications. It is easy to implement and I also wrote an article about Error handling in ASP.NET Core Web API few months ago...read more

Install multiple packages from Visual Studio package manager console

Adding multiple nuget packages to the project from package manager console
If you are using Visual Studio 2017 as your main IDE, than you are probably familiar and used at least once NuGet package manager console. You may know or maybe not, but NuGet Package Manager relies on PowerShell script and Package Manager Console is basically hosted PowerShell command line inside Visual Studio. This means, apart from NuGet commands, you can also execute PowerShell commands. ...read more

Adding healthchecks just got a lot easier in ASP.NET Core 2.2

Setting up and using healthcheck endpoints in ASP.NET Core 2.2
Health checks or health probes are the crucial part for orchestrating micro services. If you are using Kubernetes for orchestrating containerized application instances or you just have multiple ServiceApps or VMS behind the load balancer, you need to define health checks in order for the orchestrator or load balancer to know to which instance to send the traffic and to which not...read more

Mocking IConfiguration GetValue<T> extension methods in Unit Test

How to mock extension methods for IConfiguration in .NET Core
Now here is a trouble that was bugging me for some time and I guess who ever is using IConfigration injected in the constructor and using extension methods to access configuration values reached whan trying to write Unit Tests. IConfiguration interface is a great way to easily replace your configuration layer in application, but it has it's drawbacks. The way interface envorces configuration reading is by exposing GetSection method which return IConfigurationSection...read more

Handling data concurrency in EF Core and ASP.NET Core WebAPI

Data concurrency in Entity Framework Core
Entity Framework Core implements optimistic concurrency strategy which is opposite to pessimistic concurrency strategy. Lets's first clear out what are main differences between these two approaches in concurrency control. Optimistic concurrency control allows multiple processes to access and modify data without any explicit lock on the data...read more

Setting up Swagger to support versioned API endpoints in ASP.NET Core

Adding Swagger support for versioned REST Web API endpoints
Versioning of your endpoints is important especially if you have 3rd party dependent clients of your REST API service. Any change in your endpoint, for example in data structure may impact clients even if it is backward compatible, clients may process your endpoint data in different ways, so even adding one additional property to your model may also impact functionality of the client which is consuming your endpoint. Prerequisites ...read more

HTML5 localStorage with expiry with vanilla JavaScript

Using HTML5 localStorage with expiry
HTML5 comes with a lot of handy features which can really improve user experience of your web application significantly if you use them wisely. Caching cold data on the client, such as lookups can significantly save the amount of traffic, page load time and even you backed services load. One of the HTML5 features that can help you do this are sessionStorage and localStorage...read more

Extending Serilog with additional values to log

Adding additional information to log in .NET Core application with Serilog
If you are building .NET Core application your choice for logger library is most likely Serilog. It is really powerful and easy to use library which allows you easy logging in all levels in your application. One of the best features it has is easy extending of the data you want to have in your logs...read more

Using custom request and response serializers in ASP.NET Core

Configuring input and output serailzer/deserialier in ASP.NET Core pipeline
This is not a new subject and the support for handling WebApi input and output was introduced in .NET Core 2.0 and it's been there since then. There are couple of useful pages out there and it is even well documented on Microsoft official page Custom formatters in ASP.NET Core Web API...read more

Setting up .NET Core development environment on Ubuntu Linux

A quick guide for switching from Windows based Visual Studio 2017 to Visual Studio Code
With growing popularity of dotnet Core, Git and Docker, developers who used to work mainly on Windows are now getting used to CLI environment and obviously Linux. Windows is still a development environment platform of choice, bit since Microsoft already developed and published Visual Studio Code as a cross platform IDE for Windows, Linux and Mac. Although it is still not mature as Visual Studio 2017, it is a decent tool for .NET Core applications development...read more

Reloading the cache automatically once expired is ASP.NET MVC

Load values to in memory cache as soon as they expire in ASP.NET MVC
In memory caching is not a bullet proof way of caching data in an application, especially if this application is distributed. The lack of synchronization between nodes can cause you application to misbehave showing wrong data or even throwing exceptions and crashing. This is one of the main reasons why distributed caching is the best way of doing the caching in your web application. But not all applications you might be developing need to run as distributed on multiple machines...read more


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