For anyone ending up here. You can put #nullable enable on top of the file for a file-by-file approach as suggested by @Marc in the comments. You can also use combinations of #nullable enable/disable to annotate just parts of the file class Program { static void Main(string[] args) { #nullable enable string? message = “Hello … Read more
Classic sync using Classic using calls the Dispose() method of an object implementing the IDisposable interface. using var disposable = new Disposable(); // Do Something… Is equivalent to IDisposable disposable = new Disposable(); try { // Do Something… } finally { disposable.Dispose(); } New async await using The new await using calls and await the … Read more
The key to understanding what null! means is understanding the ! operator. You may have used it before as the “not” operator. However, since C# 8.0 and its new “nullable-reference-types” feature, the operator got a second meaning. It can be used on a type to control Nullability, it is then called the “Null Forgiving Operator” … Read more
Official answer Here is a comment from Mads Torgersen explaining this design decision from the C# 8 blog post: We decided to follow Python when it comes to the from-beginning and from-end arithmetic. 0 designates the first element (as always), and ^0 the “length’th” element, i.e. the one right off the end. That way you get a simple relationship, … Read more
C# 9 supports the following: var switchValue = 3; var resultText = switchValue switch { 1 or 2 or 3 => “one, two, or three”, 4 => “four”, 5 => “five”, _ => “unknown”, }; Alternatively: var switchValue = 3; var resultText = switchValue switch { >= 1 and <= 3 => “one, two, or … Read more
Yes, C# 8 can be used with the .NET Framework and other targets older than .NET Core 3.0/.NET Standard 2.1 in Visual Studio 2019 (or older versions of Visual Studio if you install a NuGet package). The only thing required is to set language version to 8.0 in the csproj file. You can also do … Read more