C# Program to Demonstrate the IList Interface
In C# IList interface is an interface that belongs to the collection module where we can access each element by index. Or we can say that it is a collection of objects that are used to access each element individually with the help of an index. It is of both generic and non-generic types. Its implementation is generally categorized into three parts that are:
- read-only: In which the IList cannot be modified.
- fixed-size: In which IList is not allowed to add or remove elements.
- variable size: In which IList is allowed to modify, add, or remove elements.
Syntax:
// For Non_generic IList
public interface IList : System.Collections.ICollection
// For Generic IList
public interface IList<T> : System.Collections.Generic.ICollection<T>,
System.Collections.Generic.IEnumerable<T>
Properties:
Some of the commonly used properties of the IList interface are:
Property Name |
Description |
Count |
This property will return the total number of items present in the ICollection. |
IsFixedSize |
This property will return a value that determines whether the IList has a fixed size or not. |
IsReadOnly |
This property will return a value that determines whether the IList is read-only or not. |
IsSynchronized |
This property will return a value that determines whether access to the ICollection is synchronized or not. |
Item[Int32] |
This property will gets or sets the item from the specified index. |
SyncRoot |
This property will get an object that can be used to synchronize access to the ICollection. |
Methods:
Some of the commonly used methods of the IList interface are:
Method Name |
Description |
Add(Object) |
This method is used to add an item to the IList. |
Clear() |
This method is used to remove or delete all items from the IList. |
Contains(Object) |
This method is used to check whether the IList contains a specific value or not. |
CopyTo(Array, Int32) |
This method is used to copy the elements of the ICollection to an array, starting from the given index. |
GetEnumerator() |
This method is used to get an enumerator that iterates through a collection. |
IndexOf(Object) |
This method is used to find the index of a specific item in the IList. |
Insert(Int32, Object) |
This method is used to insert an item to the IList at the given index. |
Remove(Object) |
This method is used to remove or eliminate the first occurrence of a given object from the IList. |
RemoveAt(Int32) |
This method is used to remove the IList item from the given index. |
Now we understand the working of IList interface with the help of an example. In the below example, we create a list with subjects and students and display the list. So to do this we have to follow the following approach:
Approach:
1. Create an array of subjects
{"os","cn","php","c/cpp","java/jsp","python/r"}
2. Create a list of student names and add names into it using Add() method.
List<string> data = new List<string>();
data.Add("sai");
data.Add("sravan");
data.Add("jyothika");
3. Define an IList Interface to display the students and subjects names.
static void Show(IList<string> list)
{
// Iterate through list
foreach (string str in list)
{
// Print
Console.WriteLine("\t" + str);
}
}
4. Call the Show() method to display the list of students and subjects.
Show(subjects);
Show(data);
Example:
C#
using System;
using System.Collections.Generic;
class GFG{
static void Show(IList< string > list)
{
foreach ( string str in list)
{
Console.WriteLine( "\t" + str);
}
}
static void Main()
{
string [] subjects = { "OS" , "CN" , "PHP" , "C/CPP" ,
"Java/Jsp" , "Python/R" };
List< string > data = new List< string >();
data.Add( "sai" );
data.Add( "sravan" );
data.Add( "jyothika" );
Console.WriteLine( "Subjects Name: " );
Show(subjects);
Console.WriteLine( "Students Name: " );
Show(data);
}
}
|
Output:
Subjects Name:
OS
CN
PHP
C/CPP
Java/Jsp
Python/R
Students Name:
sai
sravan
jyothika
Last Updated :
20 Dec, 2021
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