C# 8.0 non-nullable reference types and options pattern

Tl;dr: C# 8.0 introduces [Nullable Reference Types.](https://learn.microsoft.com/en-us/dotnet/csharp/nullable-references) I've found that using nullable reference types with the ASP.Net [Options Pa...

Serilog DI in ASP.NET Core, which ILogger interface to inject?

I've successfully configured Serilog in my ASP.NET Core application, only the DI part remains. Now I have two ILogger interfaces, one is `Serilog.ILogger` the other is `Microsoft.Extensions.Loggi...

ASP.NET Core- How to allow nullable [FromBody] object in controller method?

Let's say I have a simple controller with one POST method that accepts an object from its body. However, the presence of this object should be optional in the HTTP request body. I tried to implement t...

How to suppress Possible Null Reference warnings

I am playing with the nullable types in c# 8 and I found a problem that is bugging me. Suppose I have a method which takes a nullable parameter. When a parameter is null, I want to throw a specific Ex...

C# Convert ReadOnlyMemory<byte> to byte[]

Given [ReadOnlyMemory Struct](https://learn.microsoft.com/en-us/dotnet/api/system.readonlymemory-1?view=netcore-3.1) I want to convert the stream into a string I have the following code: ``` var bod...

19 Jun at 04:42

ERROR: Could not build wheels for scipy which use PEP 517 and cannot be installed directly

I'm trying to install scipy via pip on my 64 bit ARMV8 board. I have already installed openblas which is required by scipy. So, no issues with that. When i gave `pip3 install scipy --trusted-host pypi...

.NET Core 3.1 - Dependency resolution failed for component - AWS Mock Lambda Test Tools

I create a new AWS Lambda .NET Core 3.1 project, then run it using AWS Lambda Test Tools, then I get this page as expected: [](https://i.stack.imgur.com/Usst9.png) However, if I install one of these p...

20 Jun at 09:12

Error CS1503 - Cannot convert from Microsoft.Extensions.Configuration.IConfigurationSection to System.Action<>

I am getting an error: When I am using Configure with Bind(), it is working. ``` var bandConfig = new BandSettings(); Configuration.GetSection("BandSettings").Bind(bandConfig ); ``` But with t...

21 Apr at 20:31

Error message "DevTools failed to load SourceMap: Could not load content for chrome-extension://..."

I'm trying to display an image selected from the local machine and I need the location of that image for a JavaScript function. But I'm unable to get the location. To get the image location, I tried u...

31 Jan at 04:57

Rerun failed .NET unit test from PowerShell script or .NET

The [Visual Studio Test task in Azure Devops](https://learn.microsoft.com/en-us/azure/devops/pipelines/tasks/test/vstest?view=azure-devops) has a really cool feature, the ability to retry the failed u...

How can I exclude a controller from ASP.NET Core 3 Attribute Routing

I am using ASP.NET Core 3.1 for my web API. I have multiple controllers all using attribute-based routing and all is well. We want to be able to toggle one or more controllers with feature flags in ...

20 Apr at 14:20

Could not load file or assembly System.Numeric.Vectors in ML.NET

I created a new console application .net46, install the latest ML and tried a simple LDA. Got the error above. None of the fix that I found on the web seems to work. It is looking for a 4.1.3.0 versio...

15 Dec at 08:50

Missing Assemblies Tab in Reference Manager dialog box

I have the latest Visual Studio Community version 2019. I have been following this awesome free series by Bob Tabor. Sorry about the link to images, but rules are rules I guess, can't add images until...

19 Apr at 22:44

JsonServiceClient C# In Excel COM Add-In

We develop an Excel COM Add-In using add-in express. We have been using this add-in past 6 months and we don't have any issue. Past few weeks we start facing an issue in the add-in and after debugging...

19 Apr at 19:56

EF Core No tracking and Add() or Update()

I'm trying to make my DbContext to work without tracking. Also, after every Add(..) or Update(..) I remove the tracking of the new entity: The problem arises if I add (or update) a new entity that has...

java.lang.NoClassDefFoundError: Could not initialize class org.codehaus.groovy.vmplugin.v7.Java7

I am getting this exception `java.lang.NoClassDefFoundError: Could not initialize class org.codehaus.groovy.vmplugin.v7.Java7 and java.lang.NoClassDefFoundError: Could not initialize class org.codeha...

28 Aug at 11:56

Add JSON string directly to Azure Blob Storage Container using C#

I am trying to load a JSON string (serialized with Newtonsoft.Json) I am serializing object in runtime using JsonConvert.SerializeObject(obj,settings) which returns a string. Following Microsoft do...

17 Apr at 20:53

How to add a WCF service reference in a .NET Core 3.1 application?

I'm attempting to add a WCF service reference to a .Net Core 3.1 web API. I'm using Visual Studio 2019 in admin mode. I get the following error: ``` Importing web service metadata ... Number of servi...

17 Apr at 17:44

ServiceStack ServiceClient stores wrong cookies after authentication

i have a strange problem with Servicestack Authentication. I've developed an Asp .Net Core web app (.net core 3.1) in which is implemented a servicestack authentication with credentials auth provider...

How to map fallback in ASP .NET Core Web API so that Blazor WASM app only intercepts requests that are not to the API

I have a Blazor WebAssembly solution with a client project, server project and shared project, based on the default solution template from Microsoft. I'm editing and debugging in Visual Studio 2019 pr...

4 Nov at 19:0

ServiceStack service unable to return dynamic response object, both as Json and XML

I've built a service, that combines and returns a set of dynamic json data from an external service. Returning the data as json is fine - but XML... I've tried returning it as raw XML in a string-pro...

16 Apr at 17:10

Nullable reference types and constructor warnings

I'm trying to embrace C# 8's nullable references types in my project and make it smoothly work with EF Core. Following [this guide](https://learn.microsoft.com/en-us/ef/core/miscellaneous/nullable-re...

Angular 9 - NGCC fails with an unhandled exception

Building the application after having upgraded dependencies to Angular 9 (and having performed the necessary code changes) throws an error: > Compiling @angular/animations : es2015 as esm2015 Compil...

How to hide a property just in post request description of swagger using swashbuckle?

I am new to ASP.NET Core and this question looks simple but I couldn't find a proper solution online. So here's the problem. This is the structure of the class that I am using. ``` public class Alert...

Why does ServiceStack burden the DTOs with routing concerns?

I'm learning ServiceStack, and from reading [this page](https://docs.servicestack.net/your-first-webservice-explained), a couple of things aren't clear to me. So, considering this DTO pair: ``` [Rou...

14 Apr at 12:57