Collection<T>.Remove(T) is used to remove the first occurrence of a specific object from the Collection<T>.
Syntax:
public bool Remove (T item);
Here, item is the object to remove from the Collection<T>. The value can be null for reference types.
Return Value: True if item is successfully removed, otherwise, False. This method also returns False if item was not found in the original Collection<T>.
Below given are some examples to understand the implementation in a better way:
Example 1:
// C# code to remove the first // occurrence of a specific object // from the Collection using System;
using System.Collections.Generic;
using System.Collections.ObjectModel;
class GFG {
// Driver code
public static void Main()
{
// Creating a collection of strings
Collection< string > myColl = new Collection< string >();
// Adding elements in Collection myColl
myColl.Add( "A" );
myColl.Add( "B" );
myColl.Add( "C" );
myColl.Add( "D" );
myColl.Add( "E" );
// Displaying the number of elements in myColl
Console.WriteLine( "Count : " + myColl.Count);
// Displaying the elements in myColl
foreach ( string str in myColl)
{
Console.WriteLine(str);
}
// Removing the first occurrence of
// a specific object from the Collection
myColl.Remove( "C" );
// Displaying the number of elements in myColl
Console.WriteLine( "Count : " + myColl.Count);
// Displaying the elements in myColl
foreach ( string str in myColl)
{
Console.WriteLine(str);
}
}
} |
Output:
Count : 5 A B C D E Count : 4 A B D E
Example 2:
// C# code to remove the first // occurrence of a specific object // from the Collection using System;
using System.Collections.Generic;
using System.Collections.ObjectModel;
class GFG {
// Driver code
public static void Main()
{
// Creating a collection of ints
Collection< int > myColl = new Collection< int >();
// Adding elements in Collection myColl
myColl.Add(2);
myColl.Add(3);
myColl.Add(4);
myColl.Add(4);
myColl.Add(5);
// Displaying the number of elements in myColl
Console.WriteLine( "Count : " + myColl.Count);
// Displaying the elements in myColl
foreach ( int i in myColl)
{
Console.WriteLine(i);
}
// Removing the first occurrence of
// a specific object from the Collection
myColl.Remove(4);
// Displaying the number of elements in myColl
Console.WriteLine( "Count : " + myColl.Count);
// Displaying the elements in myColl
foreach ( int i in myColl)
{
Console.WriteLine(i);
}
}
} |
Output:
Count : 5 2 3 4 4 5 Count : 4 2 3 4 5
Note: This method performs a linear search. Therefore this method is an O(n) operation, where n is Count.
Reference: