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This uses an Action delegate, with this signature:
public delegate void Action (T obj);
Here’s the first example rewritten with Array.ForEach:
Array.ForEach (new[] { 1, 2, 3 }, Console.WriteLine);
Length and Rank
Array provides the following methods and properties for querying length and rank:
public int GetLength (int dimension);
public long GetLongLength (int dimension);
public int Length { get; }
public long LongLength { get; }
public int GetLowerBound (int dimension);
public int GetUpperBound (int dimension);
public int Rank { get; } // Returns number of dimensions in array
GetLength and GetLongLength return the length for a given dimension (0 for a singledimensional
array), and Length and LongLength return the total number of elements
in the array—all dimensions included.
GetLowerBound and GetUpperBound are useful with nonzero indexed arrays.
GetUpperBound returns the same result as adding GetLowerBound to GetLength for any
given dimension.
Searching
The Array class provides a range of methods for finding elements within a onedimensional
array:
public static int BinarySearch (T[] array, object value);
public static int BinarySearch (T[] array, object value, IComparer
comparer);
public static int BinarySearch (Array array, object value);
public static int BinarySearch (Array array, object value, IComparer
comparer);
public static int IndexOf (T[] array, T value);
public static int IndexOf (Array array, object value);
public static int LastIndexOf (T[] array, T value);
public static int LastIndexOf (Array array, object value);
// Predicate-based searching:
public static T Find (T[] array, Predicate match);
public static T FindLast (T[] array, Predicate match);
public static T[] FindAll (T[] array, Predicate match);
public static bool Exists (T[] array, Predicate match);
public static bool TrueForAll (T[] array, Predicate match);
278 | Chapter 7: Collections