My standard is always PascalCase, also spell out the full word. I don’t like abbreviations as they can have multiple meanings. So, in your PascalCase scenario, I would spell out the ‘Calc’ word to be the following: public static int Factorial(int n) { return CalculateFactorial(n); int CalculateFactorial(int number) => (number < 2) ? 1 : … Read more
I couldn’t find any good tutorial yet. But you can look at the compiler unittests which create such task-like types (look for “[AsyncMethodBuilder”). The starting point is to create a type and mark it as task-like with an attribute like [AsyncMethodBuilder(typeof(MyTaskBuilder))]. Then you need to define your own MyTaskBuilder type. It must implement a certain … Read more
The type pattern in its various forms: x is T y, case T y etc, always fails to match when x is null. This is because null doesn’t have a type, so asking “is this null of this type?” is a meaningless question. Therefore t is int? i or t is Nullable<int> i makes no … Read more
Look at tuple as bags of variables and, as such, the convention is to use camel case.
Local functions in C# are clever in terms of their capturing – at least in the Roslyn implementation. When the compiler is able to guarantee that you aren’t creating a delegate from the local function (or doing something else that will prolong the lifetime of the variable) it can use a ref parameter with all … Read more
It works for me, create a tuple first and convert it to a ValueTuple： var post = iPostService.GetAll(). Select(x => new Tuple<string, string>(x.Title, x.Author).ToValueTuple())
Of course, by creating the tuple from your LINQ expression: public (int id, string name) GetSomeInfo() { var obj = Query<SomeType>() .Select(o => (o.Id,o.Name)) .First(); return obj; } According to another answer regarding pre-C# 7 tuples, you can use AsEnumerable() to prevent EF to mix things up. (I have not much experience with EF, but … Read more
You need to update nuget package named “Microsoft.Net.Compilers” to the latest version. Most likely you have version 1.3.2 installed in your project but you need 2.0.1 to use C# 7 features. Alternatively – you can remove this package at all (together with packages that depend on it) – then it will also work, because it … Read more
As explained by Neal Gafter from Microsoft: The reason it doesn’t work is that there is no conversion (explicit or implicit) defined from T to KeepalivePacket. Pattern matching requires such a conversion to exist, as it is defined in terms of the cast operator, which requires a conversion exist. The language specification and compiler agree … Read more
You are looking for a syntax like this: List<(int, string)> list = new List<(int, string)>(); list.Add((3, “first”)); list.Add((6, “second”)); You can use like that in your case: List<(int, string)> Method() => new List<(int, string)> { (3, “first”), (6, “second”) }; You can also name the values before returning: List<(int Foo, string Bar)> Method() => … … Read more