Why in C# do I get a compiler warning CS8618 on init properties

I have this code With the following compiler warning: > [CS8618] Non-nullable property 'SomeProperty' must contain a non-null value when exiting constructor. Consider declaring the property as nullabl...

My System.CommandLine app won't build! It can't find a CommandHandler. Do I need to write it?

I am using VS 2022, .Net 6.0, and trying to build my first app using `System.CommandLine`. Problem: when I build it, I get an error > The name 'CommandHandler' does not exist in the current context Th...

18 Dec at 06:53

ServiceStack OrmLite SelectMulti same table

This is a bit related to this question: [Joining same table multiple times in ServiceStack.OrmLite](https://stackoverflow.com/questions/53436421/joining-same-table-multiple-times-in-servicestack-ormli...

16 Dec at 04:26

Does the Log4j security violation vulnerability affect log4net?

I have recently read about the [zero-day](https://en.wikipedia.org/wiki/Zero-day_(computing)) issue in Log4J. I work with a few applications, written with .NET, that use the [log4net](https://logging....

4 Jan at 22:59

How to change default port no of my .NET core 6 API

I am trying to change default port from properties section of project but I am not able to see any options. I am using visual studio 2022 with .NET core 6.

13 Dec at 10:42

Visual Studio 2022 build failed - but showing no errors

The only strange thing is a warning on the projects, but without any indication of what it is: [](https://i.stack.imgur.com/UvHoz.png) [](https://i.stack.imgur.com/DSaaZ.png) [](https://i.stack.imgur....

11 Dec at 17:43

Foreign key created in shadow and appending random 1 to column name - ASP:NET EF Core

When I migrate my new models and data I get the following error for multiple foreign keys: >The foreign key property 'InsurancePolicy.InsuranceSubjectID1' was created in shadow state because a conflic...

5 May at 16:47

Satisfy() in Fluent Assertions does not work with collections of class objects

I have a class: and a collection of objects of this class: I'd like to assert that each object's `CampusId` equals 38: But the assertion fails with the following message: Expected collection to satisf...

6 May at 07:15

ServiceStack Axios URL special charaters

What is the best way to deal with special characters in URL's with ServiceStack and a Javascript Axios client, or any other client. Example: URL Path: /MasterItems/{Code} - Code can have any character...

8 Dec at 14:36

'Unable to resolve service for type ¨Microsoft.entityFrameworkCore.DbContextOptions¨1[LibraryData.LibraryContext] while attempting to activate

I've run into a problem i cannot solve on my own, so I'm asking for help. I've recently began learning ASP .net core, and wanted to build a library where i have to have a database, login system and ad...

13 Feb at 09:46

NuGet System.Drawing.Common .NET 6 CA1416 This call site is reachable on all platforms. 'Image.FromStream(Stream)' is only supported on: 'windows'

Upgrading NuGet `System.Drawing.Common` to 6.0.0 causes the following error: > CA1416 This call site is reachable on all platforms. 'Image.FromStream(Stream)' is only supported on: 'windows'. [https:/...

15 Dec at 08:42

How do I access the Response Headers using ServiceStack

I'm using react with Redux toolkit but I'm unbale to access the Response headers ``` return await client .get(new Users()) .then((data) => { // how to I access the Response Header here? console.log...

7 Dec at 15:21

error NETSDK1031: It is not supported to build or publish a self-contained application without specifying a RuntimeIdentifier

I am running following command to publish .NET CORE 5.0 web api project using command line on . ``` c:\test\Service>dotnet publish -c release Emp.sln --framework net5.0 /p:DebugType=None /p:DebugSymbo...

Microsoft.Extensions.Hosting.HostFactoryResolver+HostingListener+StopTheHostException

I'm using Asp.Net Core Web Api 6 I'm facing an error when migrating my DbContext and when updating the database The Error ``` [17:07:29 INF] Application Is Starting [17:07:29 FTL] Application terimnat...

Get Configuration value from IHostBuilder in Net 6

I am creating a Worker application using Net 6 and I have in Program.cs: ``` IHostBuilder builder = Host.CreateDefaultBuilder(args); builder.ConfigureHostConfiguration(x => { x.AddJsonFile("setting...

4 Dec at 10:47

How to upgrade from RijndaelManaged to AES?

I have a working solution for crypt/decrypt data in my code (below) but when I have upgraded the project to `DOTNET6`, RijndaelManaged becomes obsolete: > Warning SYSLIB0022 'RijndaelManaged' is obs...

10 Feb at 17:47

.NET 6.0 C# "new console template" - how to read CLI arguments?

Now that .NET 6.0 is out, what appears to have be a radical update to the default CLI project template is the absence of the familiar boilerplate being reduced to the following: ``` // See https://aka...

Minimal API in .NET 6 using multiple files

In .NET 6 it is possible to create minimal APIs: ``` var builder = WebApplication.CreateBuilder(args); var app = builder.Build(); app.MapGet("/products/{id}", (int id) => { return Results.Ok(); }) ap...

.NET 6 IntersectBy and ExceptBy examples

Could someone provide me a small example on how to Use the .NET 6 LINQ `IntersectBy` and `ExceptBy` methods? MSDN hasn't got any examples and the one I tried doesn't compile due to CS0411 error. The e...

27 Nov at 14:22

Sudden - 'The certificate chain was issued by an authority that is not trusted in Microsoft.Data.SqlClient' in working project

I have an ASP.Net Webforms website running in IIS on a Windows Server. Also on this server is the SQL server. Everything has been working fine with the site but now I am seeing issues with using a Dat...

25 Nov at 14:12

DateOnly Json Conversion in .net6 api

How can I add the DateOnly JsonConverter to the application configuration of a .net6 web api? I have an object with DateOnly properties on it and I'm returning it from the controller. When I make my ...

3 Nov at 20:0

Publish .net MAUI Application as windows executable

How can I publish a .net MAUI Application to a Single executable? Is this even possible? I Have an application which I want my friends to use on their Windows PC. Is there any way without using the co...

24 Nov at 14:19

Ping Tasks will not complete

I am working on a "heartbeat" application that pings hundreds of IP addresses every minute via a loop. The IP addresses are stored in a list of a class `Machines`. I have a loop that creates a `Task<M...

30 Nov at 13:11

Integration test and hosting ASP.NET Core 6.0 without Startup class

To setup unit tests in previous versions of .Net Core, I could host my WebApp or WebAPI in a test project the following way: ``` IHost host = Host.CreateDefaultBuilder() .ConfigureWebHostD...

24 Nov at 18:27

Run EF migrations on Startup in asp.net core 6 application

How can I run ef migrations on startup in asp.net 6 application. This is my Program.cs ``` var builder = WebApplication.CreateBuilder(args); var connectionString = builder.Configuration.GetConnectionS...