What's the benefit of var patterns in C#7?

Question

I don\'t understand the use case of var patterns in C#7. MSDN:

A pattern match with the var pattern always succeeds. Its syn

Answer 1

In most cases it is true, the var pattern benefit is not clear, and can even be a bad idea. However as a way of capturing anonymous types in temp variable it works great. Hopefully this example can illustrate this: Note below, adding a null case avoids var to ever be null, and no null check is required.

        var sample = new(int id, string name, int age)[] { 
                                                          (1, "jonas", 50),                                                                                                                            
                                                          (2, "frank", 48) };

        var f48 = from s in sample 
                  where s.age == 48 
                  select new { Name = s.name, Age = s.age };

        switch(f48.FirstOrDefault())
        {
            case var choosen when choosen.Name == "frank":
                WriteLine(choosen.Age);
                break;
            case null:
                WriteLine("not found");
                break;
        }