Tag: NETCore3

What in tarnation (and tarnation accessories)

Fixing unexpected Microsoft.AspNetCore package errors after a dependency update

This was a fun one! Suddenly, while running or debugging my ASP.NET Core 3.1 application, I started getting errors about missing assemblies, along the lines of “FileNotFoundException: Could not load file or assembly Microsoft.AspNetCore.Components.Forms“. These DLL files were not required a minute earlier – nor did requiring them really make much sense in my mind – but there was a nonsensical, easy fix, so in the end it was all good! But let’s go through this thing in order. What was the problem now? Problem…Continue reading Fixing unexpected Microsoft.AspNetCore package errors after a dependency update

.NET Core fundamentals in one picture.

How to disable “Register” action in ASP.NET Core?

Sometimes you’ll need the default identity for your ASP.NET Core application, but want to disable the registration of new users. Sounds pretty basic, right? However, there’s actually no easy switch you can just flip to enable or disable said functionality. I went through a lot of different articles and ideas by other people. Most of them involved fiddling with IdentityController, creating new scaffolded pages, adding new Actions with redirection code, and who knows what else… But who wants to fiddle with Identity? It’s glitchy and…Continue reading How to disable “Register” action in ASP.NET Core?

Debugging. Yeah, that's roughly what the process looks like. With all those tiny symbols and all. Debug/Trace/Whatever.

Adding Debug listeners to your console application fails in .NET Core

Every now and then comes the need to write your console output to a log file. There’s a simple way to do this in .NET Framework, and quite a few online articles detailing a borderline one-liner on how to do achieve it: Adding a log file listener(s) by calling Debug.Listeners – something like this: TextWriterTraceListener tr1 = new TextWriterTraceListener(System.Console.Out); Debug.Listeners.Add(tr1); TextWriterTraceListener tr2 = new TextWriterTraceListener(System.IO.File.CreateText(“Output.txt”)); Debug.Listeners.Add(tr2); Source However, this doesn’t work in .NET Core anymore. Problem: Everything changes in .NET Core Using the code offered…Continue reading Adding Debug listeners to your console application fails in .NET Core

An accurate depiction of a NuGet package factory

Solving: ‘DbContextOptionsBuilder’ does not contain a definition for ‘UseSqlServer’

This is another, kind of a classic and simple solution to a fairly simple problem: How to fix it, when your DbContextOptionsBuilder fails to take in your connection string and complains about UseSqlServer missing or whatever? Okay – let’s take a step back. How did we end up here? So, let’s set the scene. You’re building your DbContext (called ApplicationDbContext in the example below) in a .NET Core application of some sorts. You’ll do this like shown below: using Microsoft.EntityFrameworkCore; using System; namespace YourNamespace {…Continue reading Solving: ‘DbContextOptionsBuilder’ does not contain a definition for ‘UseSqlServer’

Internet Explorer working like Internet Explorer usually does - not working. But this time it's Blazor's fault!

IE11 fails to load a (server-side) Blazor web app

Welp – this was not a fun issue to run into! While nobody in this day and age should use Internet Explorer for any normal usage (occasional legacy scenarios aside), there are still some luddites who do (or whose IT department makes them to). This means it’s still useful, and sometimes even required, for a web application to work even in Internet Explorer. Description of the issue So, like shown in the article’s image, when trying to access your web application using IE11, the page…Continue reading IE11 fails to load a (server-side) Blazor web app

Entity Framework Core logo

How to create a DbContext from just a connection string?

When you’re in your .NET Core project, it’s always easy: you just register your DbContext in ConfigureServices, and then inject it into whichever Page, View or Controller you might need it in. However, when you have another project or solution you’re working on and you’d still like to use the same DbContext and your entity classes in it, you have to find another way to do it! What should we do, then? Description Let’s first take a look at the use cases and tech stack.…Continue reading How to create a DbContext from just a connection string?

Blazor blazing away some geeks.

How to fix “The type or namespace name ‘Services’ does not exist in the namespace ‘Microsoft.AspNetCore.Components’ (are you missing an assembly reference?)”

Just resolved a random issue that’s difficult enough to google, that I think it’s worth documenting! These seem to be popping up whenever you work with anything that’s fairly fresh out of oven… This particular case revolves around Visual Studio being incredibly obnoxious, and starting to throw a ton of errors on code that worked five minutes prior. In my case, the error happened after updates to Visual Studio. Always fun. Symptoms The errors started popping up in Visual Studio. Basically, I just started getting…Continue reading How to fix “The type or namespace name ‘Services’ does not exist in the namespace ‘Microsoft.AspNetCore.Components’ (are you missing an assembly reference?)”

.NET Core fundamentals in one picture.

How to use UriHelper or NavigationManager in .NET Core 3.0 & Blazor?

Just a quick piece of documentation, as this piece of code has changed in different versions of .NET Core 3.0 so far a few times. Need to have things like this written down somewhere! UriHelper / NavigationManager with .NET Core 3.0 Both of these helper libraries do essentially the same thing: navigate/browse/redirect the user to a different address, component, page or view in or by your web app. What you normally use this library for is exactly the same in all versions I’ve worked with,…Continue reading How to use UriHelper or NavigationManager in .NET Core 3.0 & Blazor?

A simple graphical explanation of Blazor's effect on the web development landscape.

HttpClient in Blazor

Blazor is a new (ish) framework for building web UIs with C#. It either uses SignalR to manage connections between your client-side and server-side code, or even compiles directly to WebAssembly, in both cases cutting out the need to write any pesky JavaScript yourself – pretty neat, if you ask me! However, developing your web apps with Blazor is a bit different from using ASP.NET MVC, for example. Other people have written great introductions to the tech, so I’ll stick to the problem at hand:…Continue reading HttpClient in Blazor

SOLVE ALL THE ERRORS!

‘__generated__Index.OnInitAsync()’: no suitable method found to override

Welp – just ran into this one, and as I expect others to encounter the same issue, better document in right away! So in Blazor, I was crafting a simple component that’d display some data in a nice way. Being lazy and crafty, I thought I’d copy-paste some similar code from an earlier POC I had built, since I knew it worked. The component was overriding a method called “OnInitAsync”, and it just nicely fetched data after initialized. But alas, it didn’t. Not anymore. I…Continue reading ‘__generated__Index.OnInitAsync()’: no suitable method found to override

GitHub thread about the error - and long and winding discussion about the topic.

How to resolve build failing with .NET Core 3 and Microsoft.AspNetCore.Mvc.Versioning

Building a proof-of-concept on .NET Core 3.0 preview 7 I ran into issues when developing web APIs. This release is production-ready (according to Microsoft -see below), but every now and then you run into really unintuitive and sometimes surprising issues. Go LiveNET Core 3.0 Preview 7 is supported by Microsoft and can be used in production. We strongly recommend that you test your app running on Preview 7 before deploying Preview 7 into production. If you find an issue with .NET Core 3.0, please file…Continue reading How to resolve build failing with .NET Core 3 and Microsoft.AspNetCore.Mvc.Versioning