I am new to nullable.
Is there a meaningful difference between the possible notations?
string?[] str
string[]? str
and even string?[]? str seems to all be valid

Is there a difference in the declaration of lambda expressions between the .NET Framework and .NET Core?
The following expressions compiles in .NET Core:
var lastShift = timeline.Appointments
...

Interestingly, when I go to the definition of IList<T> in the Visual Studio, it's not the same as the source code on GitHub.

IList<T>
public interface IList<T> : ICollection<T...

I encountered an incompatible problem while I was trying to upgrade my projects from .NET core 3.1 to the latest .NET 5.
My original code has a validation logic to check invalid file name character...

I'm following the Create a web API with ASP.NET Core and MongoDB Tutorial
And I'm missing something very basic, how to serialize a Json object that has a property that could be "multi-type&quo...

I have a project using .NET Standard 2.1 and .NET core 3.1 - so the C# version is 8.0
According to a few articles I found (e.g. one, two), it should be possible to define a record type using this s...

With C# 8 we got ranges to get "sub lists".
While this works:
var array = new string[] { "abc", "def", "ghi" };
var subArray = array[0..1]; // works

This do...

I know this might seem impossible at first and it seemed that way to me at first as well, but recently I have seen exactly this kind of code throw a NullReferenceException, so it is definitely poss...

I'm your classic OOP developer. However since I discovered purely functional programming languages I've been ever intrigued to the why since OOP seemed to solve most business cases in a reasonable ...

Why does double.IsNegative(double.NaN) unexpectedly return true whereas double.NaN < 0 returns false as expected?

I had an update for Visual Studio 2019 community. I am now on version 16.10.2. But now I can't open my solutions anymore. Existing projects aren't loading and the log says this:

==================...

Summary
I have found that inserting a class between an interface and another derived class results in the interface's default implementation being called rather than the derived implementation for ...

I want to define a dictionary of alphabets. In this dictionary, the characters are keys and there are assigned a value for each one.
I have written it in the simplest way and as you can see some keys

using System.ComponentModel.DataAnnotations;

public class User
{
[Required]
public string FirstName { get; set; }

[Required]
public string LastName { get; set; }
}

User user = ne...

This is how I would do it using Github:
jobs:
run-tests:

runs-on: ubuntu-latest

defaults:
run:
working-directory: ./MyApp

steps:
- uses: actions/checkout@v2
...

I have a class ScoreStrategy that describes how to calculate points for a quiz:
public class ScoreStrategy
{
public int Id { get; set; }

public int QuizId { get; set; }

[Required]

I have a dictionary of type
Dictionary<int, (float, float)>

when trying to read the value from it I can't use this way
if (myDict.TryGetValue(1, out (float tupleItem1, float tupleItem2))) { ...

I'm working on a library that allows users to instantiate some delegates.
I have a defined a delegate type that deals with a struct as one of its parameters, that we only need to read and not modif...

Id noticed that this is operator produces the same results and even compiles the same (see this gist) as the == operator. Is this a correct usage of the is operator given that I can only see things

I'm trying to implement JWT based authentication in my App that has an Angular 8 Frontend and .Net Core Backend. I have added
app.UseAuthentication();
app.UseAuthorization();

and
services.