Sharing my best software development tips and tricks. From quick tips to actual guides and solutions.
This article explains how to perform a very simple and lightweight database connection test for an existing database context. A while ago, I needed to develop a simple API that I can poll from a load balancer to see whether: An Azure service hosting it is up and It has a connection to its SQL database This simple API would be used for monitoring purposes – simple stuff, sure, but what’s the best way to implement this without causing any unnecessary load to the database,…Continue reading How to verify connection to database in Entity Framework Core?
This time, I’m happy to present you perhaps the simplest way of fixing an annoying and persistent issue with a misleading error message! Wait, does that sound familiar? It’s almost like that’s what half of my articles are about… Anyway, I was happily going my way about creating a couple of new fields to an entity and then scaffolding my changes to a new migration using Entity Framework Core’s Add-Migration, but this happened: Build started… Build failed. “Oh”, I thought. “I must have messed something…Continue reading How to resolve persistent “Build started… Build failed.” when trying to run Entity Framework Core commands?
This article offers yet another possible fix to an issue, where trying to call SaveChanges() in Entity Framework Core throws a pretty generic “An error occurred while updating the entries”-exception, and you’re left wondering what in tarnation is wrong this time. And admittedly, that’s a really generic error, so it could be pretty much whatever. But in this article, I’ll go through one possibility – hopefully it helps! Problem So I was just pushing in some new rows to an incredibly simple table in my…Continue reading How to resolve another “An error occurred while updating the entries” exception in Entity Framework Core
Recently, while building an app service to host a .NET Core API, I had to implement the logic for using both Read-Only and Read-Write Database Contexts for Entity Framework Core. In this particular case, it was the same database – just different contexts, because depending on the location of the app service the app was deployed in, read and write operations might actually go to different database instances, That’s really easy, right? Well… Yes and no. Essentially, it’s easy to spin up, but comes with…Continue reading How to implement multiple Connection Strings for one DbContext in EF Core?
This article describes a curious fix I found to an issue where Application Insights (seemingly) crashes your Azure App Service, leaving behind interesting and non-descriptive errors in the Application Event Logs. Problem Does your Application Insights look like this, too? Event logs full of “Production Breakpoints” with weird errors about named pipes? In my case, the errors were something like these below: IfFailRet(pNamedPipe->Read((BYTE*)&controlRequest, sizeof(SnapshotHolderControlStruct))) failed in function CSnapshotHolder::HandleNewPipeConnection: -2147024787 And: CNamedPipe::Read – Read from named pipe failed: 0x8007006D. These errors would always pop up at…Continue reading How to fix weird “Production Breakpoints” errors in an Azure App Service?
This article describes how to access and extract the connection strings from your Entity Framework (Core) database context objects. This is quite convenient if you need to display or log the connection string used for your current DbContext for some reason – or if you somehow form your DbContext objects dynamically, and need to verify which connection string you’re using. I’m sure there are other use cases, too. You probably have an interesting one, if you landed on this page! Problem A while ago, I…Continue reading How to get the EF Core Connection String?
This article will briefly explain the different NuGet package versioning schemes – both automatic and manual – available. Then we’ll take a look at how to implement a nifty, and quite frankly, downright elegant automatic versioning scheme for your NuGet packages. Okay – returning from quite a trip down another rabbit hole, I think it’s a good time to document some of my findings in regards to Azure DevOps NuGet package versioning! This seems to be another area, where the documentation certainly does exist, but…Continue reading Fun with Azure DevOps NuGet package versioning!
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
Every now and then you run into a situation, where you really need to run some SQL against your local development database. That database, at least in my case, is hosted on your local SQL Server Express. Connecting to a local SQL Server should be a walk in a park, right? Eh, well… While using a connection string to connect to said DB is easy, you can’t do that with the SQL Server Management Studio. I wish you could, but hey – it is what…Continue reading How to access local MSSQL server using SQL Server Management Studio?
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?
Ran into this one when trying to push my merge from upstream. I was adhering to my own instructions (see below for a link), but got the error (further below) that stopped me from using GitHub Desktop to push (sync) at all. Posts Related to “How to resolve “refusing to allow an integration to create or update .github/workflows/main.yml” on GitHub Desktop?”:Sync local repo with the original on GitHub (Git merge upstream)How to list your git stashes?Worx Landroid L2000 (WR155E) – an honest review
Ran into another interesting one when working with a .NET Core 3.0 project and Entity Framework Core – this time, RuntimeIdentifier configuration causing trouble. In short, running Update-Database (to apply code-first migrations to your local database) locally would return this, annoying error: Failed to load the dll from [runtimepath]\win-x86\hostpolicy.dll], HRESULT: 0x800700C1 An error occurred while loading required library hostpolicy.dll from [runtimepath]\win-x86\] I suspect this can happen with any x86 runtimeIdentifier, but the one I had specified in my .csproj-file was this: win-x86 This value (or…Continue reading EF Core fails to load hostpolicy.dll when RuntimeIdentifier is win-x86
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?)”
Okay – a quick piece of documentation that was a bit lackluster, so it’s again a good idea to log somewhere. How to package a simple DLL that’s a result of your Azure DevOps Pipeline? In my particular case, I have configured a post-build step to obfuscate the DLL, that’s first built by MSBuild. That works nicely. However, the default way to create a NuGet package, where you select a project (usually you pass the same variable to NuGet pack command that you used earlier…Continue reading Azure DevOps – how to package a single DLL?
This is a tip that should often be the first thing you do in your projects with database backend, no matter which technology you use: Add some basic info about modified and created times, and the user information – so that if something happens, everyone will know who to blame 😉 There’s a lot of great blog articles describing how to do this in .NET Framework, but not that many for .NET Core. It’s very similar, but not the same. I learned that by copy-pasting…Continue reading How to add creator/modified info to all of your EF models at once in .NET Core
This article describes how to fix a situation, where you can’t use any of the navigation properties of your Entity Framework Core entities, since they are all null, despite data being in the database for sure. So, another day, another error. This time I can’t blame SharePoint, since I just messed up with ASP.NET Core and Entity Framework Core. :) Symptoms No matter what I’d do, I was getting null values for my navigation properties on my entities. They’d would always be null during runtime…Continue reading EF Core returns null for a Navigation property
This post describes how you can modify your SPFx webparts to make them compatible with usage in Microsoft Teams. I’m also showing some basic ideas what you can do in the code to make the integration more useful! Why would we do this? Who wouldn’t want to just develop once and then run their code everywhere? Now with SPFx (SharePoint Framework) 1.8 being out (and 1.9 being out for a while before being pulled!), we’re getting one step closer to that, as we’re given an…Continue reading How to Teamsify an SPFx solution?
This article explains how to fix an issue where you’re just minding your own business, trying to access the Microsoft Teams context in your SPFx webpart’s WebPartContext via the built-in property microsoftTeams, but you run into an issue. Simple stuff, but it’s still easy to run into this one, so I think it’s worthwhile to document the solution somewhere. Problem Most likely, the line causing you issues looks something like this: this.context.microsoftTeams. Of like shown below in Visual Studio Code: This error will lead to…Continue reading How to solve the error “Property ‘microsoftTeams’ does not exist on type ‘WebPartContext’.”
Instead of being stuck on whatever version your SPFx project was originally created with, it’s possible and sometimes required to upgrade it afterwards to gain access to newer functionalities like integration with Microsoft Teams. This process, to me, is comparable to updating the .NET Framework version in your classic web application projects – while it’s sometimes a matter of simple configuration change and a rebuild, most of the time there’s a bunch of steps included and not all of them might be obvious or anywhere…Continue reading How to update SharePoint Framework for an SPFx webpart?
This is one of those “note to self” -kind of entries. This workflow is probably so natural to a lot of you all, that you won’t need to ever google it – but since I don’t do that much development with the full “fork – clone – branch – submit pull request” -process (whihc is really typical with GitHub and I guess Open Source in general), I always need to look up the instructions on how to add pull any changes from the original repository…Continue reading Sync local repo with the original on GitHub (Git merge upstream)