Liero - Vyvojari blog

Liero

Scoped DbContext in ASP.NET Core: An antipattern?

💡It is Microsoft's recommended way, but be careful. It might become nightmare. Microsoft’s official guidance recommends registering your DbContext with a scoped lifetime in ASP.NET Core. On the surface, this makes sense: a single DbContext instance is tied to the lifetime of an HTTP request, but

Reactive Exensions: Auto-unsubscribing observables

Reactive Exensions: Auto-unsubscribing observables

💡Disposing subscription is mostly an antipattern. RX have completion of observables. In .NET we are used to manually dispose anything IDisposable. IObservable<T>.Subscribe(..) method returns IDisposable, so we should dispose it to unsubscribe from underlying source and avoid possible memory leak, right? Wrong. class MyComponent(IObservable<

Blazor - Take advantage of System.Reactive aka Observables - Part 2

In November 2020 I wrote an article about RX in Blazor [https://blog.vyvojari.dev/blazor-reactive-extensions/]: how to turn a property into Observable and perform async operations (e.g. loading) based on property values. In this blog I will show even simpler and more flexible way. Before we start, I

Blazor: An unopinionated library for toast notifications

GitHub - Liero/vNext.BlazorComponents.Toasts: A javascript free blazor library for toasts notificationsA javascript free blazor library for toasts notifications - GitHub - Liero/vNext.BlazorComponents.Toasts: A javascript free blazor library for toasts notificationsGitHubLiero [https://github.com/Liero/vNext.BlazorComponents.Toasts]I've created Toast Notifications UI

Advanced validation in Blazor using FluentValidation

You are probably familiar with the great FluentValidation [https://fluentvalidation.net/] validation library - defacto industry standard for any advanced validation scenarios in .NET. There has been a few attempt to integrate FluentValidation with Blazor Forms: Blazored.FluentValidation [https://github.com/Blazored/FluentValidation], Accelist.FluentValidation.Blazor [https://github.com/ryanelian/

Entity Framwork Core SQL Fiddle

Do you need to quickly examine and possibly tune the SQL queries generated by Entity Framework? There are numerous ways, such us logging, or attaching Visual Studio debugger, but it usually means you have to rerun you application each time you make a change. There's a quicker way.

Continuous Delivery to (on premise) VM inaccessible from internet

Did you know that automated deployment to environments hidden behind firewall, e.g. intranet web application in a VNET is surprisingly easy with Azure DevOps? Azure DevOps is the most productive CI/CD platform by large margin and it won't stop to surprise me how incredibly helpful and

Blazor - Take advantage of System.Reactive aka Observables

Blazor - Take advantage of System.Reactive aka Observables

Angular: Testing Routing Permissions

Angular: Testing Routing Permissions

When it comes to security, there is never enough testing. This blog provides you with a guide to testing your route's permissions. I especially appreciate tests that exactly cover user requirements or acceptance criteria of my user stories. *you can find entire code here: https://stackblitz.com/edit/