C# List - c# - c# tutorial - c# net



What is C# list ?

  • C# List<T> class is used to store and fetch elements.
  • It can have duplicate elements. It is found in System.Collections.Generic namespace.
  • The List<T> collection is the same as an ArrayList except that List<T> is a generic collection whereas ArrayList is a non-generic collection.
 List

List

Syntax:

[SerializableAttribute]
public class List<T> : IList<T>, ICollection<T>, IEnumerable<T>, 
	IEnumerable, IList, ICollection, IReadOnlyList<T>, IReadOnlyCollection<T>
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  • List<T> includes more helper methods than IList<T> interface. The table shown below lists important properties and methods of List<T>, which are initialized using a List<T>:
Property Usage
Items Gets or sets the element at the specified index
Count Returns the total number of elements exists in the List<T>
Method Usage
Add Adds an element at the end of a List<T>.
AddRange Adds elements of the specified collection at the end of a List<T>.
BinarySearch Search the element and returns an index of the element.
Clear Removes all the elements from a List<T>.
Contains Checks whether the speciied element exists or not in a List<T>.
Find Finds the first element based on the specified predicate function.
Foreach Iterates through a List<T>.
Insert Inserts an element at the specified index in a List<T>.
InsertRange Inserts elements of another collection at the specified index.
Remove Removes the first occurence of the specified element.
RemoveAt Removes the element at the specified index.
RemoveRange Removes all the elements that match with the supplied predicate function.
Sort Sorts all the elements.
TrimExcess Sets the capacity to the actual number of elements.
TrueForAll Determines whether every element in theƂ List<T> matches the conditions defined by the specified predicate.

C# List example:

  • Let's see an example of generic List<T> class that stores elements using Add() method and iterates the list using for-each loop.
using System;  
using System.Collections.Generic;  
  
public class ListExample  
{  
    public static void Main(string[] args)  
    {  
        // Create a list of strings  
        var names = new List<string>();  
        names.Add("Sonoo Jaiswal");  
        names.Add("Ankit");  
        names.Add("Peter");  
        names.Add("Irfan");  
  
        // Iterate list element using foreach loop  
       foreach (var name in names)  
        {  
            Console.WriteLine(name);  
        }  
   }  
}  
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C# examples - Output :

Sonoo Jaiswal
Ankit
Peter
Irfan
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C# List<T> example using collection initializer:

using System;  
using System.Collections.Generic;  
  
public class ListExample  
{  
    public static void Main(string[] args)  
    {  
        // Create a list of strings using collection initializer  
        var names = new List<string>() {"Sonoo", "Vimal", "Ratan", "Love" };  
         
        // Iterate through the list.  
        foreach (var name in names)  
        {  
            Console.WriteLine(name);  
        }  
    }  
}  
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C# examples - Output :

Sonoo
Vimal
Ratan
Love
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learn csharp tutorial - c# collections - c# example programs

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learn csharp tutorial - csharp collections details - c# example programs



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