Usage of Var Pattern in C# 7

Question

I\'ve seen this example of var pattern in the new C# 7

if (o is var x) Console.WriteLine($\"it\'s a var pattern with the type {x?.GetType()?.Name}\");
         


        

Answer 1

As the question here asked by InBetween, explains one usage of var pattern is when is use switch statements as follows:

string s = null;
var collection = new string[] { "abb", "abd", "abc", null};
switch (s)
{
    case "xyz":
        Console.WriteLine("Is xyz");
        break;

    case var ss when (collection).Contains(s):
        Console.WriteLine("Is in list");
        break;

    default:
        Console.WriteLine("Failed!");
        break;

}

AS Aydin Adn said in his answer.