Saturday, July 10, 2010

Implicitly Typed Array C#

C# 4.0 in a Nutshell: The Definitive Reference
Implicitly typed array is a feature introduced with C# 3.0

that allows compiler to deduce the type of array.

private void Window_Loaded(object sender, RoutedEventArgs e)
//1. An implicitly typed array of string
var friends = new[] { "Praseed", "Biju" };

//2.  An implicitly typed array
var points = new[] { 90, 95, 966 };
MessageBox.Show (points.GetType().ToString());

//3. An array of doubles
var price = new[] { 10.40, 10, 60 };
MessageBox.Show (price.GetType().ToString());

In this example instead of I giving a type to the arrays

I am expecting the compiler to deduce the type. Compiler no doubt is a smarter guy than me.

The first two examples are self explanatory in nature.

The first example will produce an output of System.String[].

Second example will produce and output of System.Int32[].

In the third case where I am providing multiple types, the compiler will deduce the type that all other given types can be conveted to. In this case it will be producing an array of double.