Arrays (C# Programming Guide)

You can store multiple variables of the same type in an array data structure. You declare an array by specifying the type of its elements.

type[] arrayName;

The following examples create single-dimensional, multidimensional, and jagged arrays:

class LINQQueryExpressions
{
    static void Main()
    {
        
        // Specify the data source.
        int[] scores = new int[] { 97, 92, 81, 60 };

        // Define the query expression.
        IEnumerable<int> scoreQuery =
            from score in scores
            where score > 80
            select score;

        // Execute the query.
        foreach (int i in scoreQuery)
        {
            Console.Write(i + " ");
        }            
    }
}
// Output: 97 92 81

Array Overview

An array has the following properties:

  • An array can be Single-Dimensional, Multidimensional or Jagged.

  • The number of dimensions and the length of each dimension are established when the array instance is created. These values can't be changed during the lifetime of the instance.

  • The default values of numeric array elements are set to zero, and reference elements are set to null.

  • A jagged array is an array of arrays, and therefore its elements are reference types and are initialized to null.

  • Arrays are zero indexed: an array with n elements is indexed from 0 to n-1.

  • Array elements can be of any type, including an array type.

  • Array types are reference types derived from the abstract base type Array. Since this type implements IEnumerable and IEnumerable<T>, you can use foreach iteration on all arrays in C#.

C# Language Specification

For more information, see the C# Language Specification. The language specification is the definitive source for C# syntax and usage.

See Also

C# Programming Guide
Collections
Array Collection Type