Arrays C#

Arrays

Simple Arrays
Multidimensional Arrays
Jagged Arrays
The Array class
yield Statement

Simple Arrays
 An array is a data structure that contains a number
of elements of the same type.
 Array Declaration
 Syntax:
 datatype[] myArray;

 Array Initialization
 Syntax:
 datatype[] myArray=new datatype[size];// size is a integer
value

Simple Arrays
 With this declaration and initialization, the variable
myArray references four integer values that are
allocated on the managed heap.

Multidimensional Arrays
 One dimensional arrays are indexed by a single integer,
A multidimensional array is indexed by two or more
integers.
 Syntax:
 datatype[,] twodim=new datatype[size1,size2];
 Ex:
 int [,] twodim={{1,2,3},{4,5,6},{7,8,9}};

Jagged Arrays
 A two-dimensional array has a rectangular
size(Ex: 3X3).
 A jagged array is more flexible in sizing the array,
With jagged array every row can have different
Size.

Jagged Arrays
 A jagged array is an array whose elements are arrays.
The elements of a jagged array can be of different
dimensions and sizes. A jagged array is sometimes
called an "array of arrays."
 Syntax:
 datatype[][] jagged =new datatype[size][];
 Jagged[0]=new datatype[2]{//values};
 ..

The Array Class
 Array Class provides methods for creating,
manipulating, searching, and sorting arrays, thereby
serving as the base class for all arrays in the common
language runtime.
 Declaring an array with brackets is C# notation using
Array Class.
 Creating Array using Array class
 Array arr1=Array.CreateInstance(typeof(datatype),size);

 Copying Arrays
 The Clone() method that is defined with ICloneable creates a
shallow copy of the array.
 Array class implements the interface ICloneable.
 Ex:
 int[] arr1={1,2};
 int [] arr2=(int[])arr1.Clone();

IEnumerator<T> Interface
 Supports a simple iteration over a generic collection.
 Syntax:
 public interface IEnumerator<out T> : IDisposable, IEnumerator
 out T
 The type of objects to enumerate.
 This type parameter is covariant. That is, you can use either the type
you specified or any type that is more derived.
 Properties
 Current  Gets the element in the collection at the current position of
the enumerator.
 Methods
 Dispose Performs application-defined tasks associated with freeing,
releasing, or resetting unmanaged resources.
 MoveNext Advances the enumerator to the next element of the
collection.
 Reset Sets the enumerator to its initial position, which is before the
first element in the collection.

foreach Statement
 The foreach statement repeats a group of embedded
statements for each element in an array or an object
collection that implements the
System.Collections.IEnumerable or
System.Collections.Generic.IEnumerable<T> interface.
int[] array1 = new int[] { 0, 1, 2, 3, 5, 8, 13 };
foreach (int i in array1)
{
System.Console.WriteLine(i);
}

yield Statement
 C# 2.0 added the yield statement for creating
enumerations easily.
 Used in an iterator block to provide a value to the
enumerator object or to signal the end of iteration. It
takes one of the following forms:
yield return <expression>;
yield break;
 yield return statement returns one element of a
collection and moves the position to the next element,
and yield break stops the iteration.

Tuples
 The release of .NET Framework 4.0 adds Tuples to
the base class library.
 Tuples have the origin in functional programming
languages like F#.
 .NET 4 defines eight Tuple classes and one static
Tuple class that act as a factory of tuples.

Creating a Tuple
 Example 1:
public static Tuple<int,int> Divide(int divd, int divs)
{int res=divd/divs;
int rem=divd%divs;
return Tuple.Create<int, int>(res, rem);
}
var res=Divide(5,2);
Console.Write(res.Item1+”t”+res.Item2);
 Example 2:
var tuple=Tuple.Create<string, string, string, int, int, int>(
“Hello”, ”Welcome To”, ”KMIT”,1,5,78);
 You can have Tuple type itself as parameter.
 Ex:
var tuple=Tuple.Create<string, string, string, int, int, int,Tuple<int,int>>
(“Hello”, ”Welcome To”, ”KMIT”,1,5,78,Tuple.Create<int,
int>(52,59));

Arrays C#

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Arrays C#