You were very close. Just write your method like this: [return: MaybeNull] public T Get<T>(string key) { var wrapper = cacheService.Get(key); return wrapper.HasValue ? Deserialize<T>(wrapper) : default!; } You have to use the default! to get rid of the warning. But you can tell the compiler with [return: MaybeNull] that it should check for null … 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
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