Answers for "get param ? from a string"

get params js

// www.example.com/users?token=12345

let params = (new URL(document.location)).searchParams;
let token = params.get("token");
// 12345

params string

Actually, the params is just a syntactic sugar handled by the C# compiler, so that

this:

void Method(params string[] args) { /**/ }
Method("one", "two", "three");
becomes this:

void Method(params string[] args) { /**/ }
Method(new string[] { "one", "two", "three" })