C# | Removing first occurrence of object from Collection<T>
Last Updated :
01 Feb, 2019
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:
using System;
using System.Collections.Generic;
using System.Collections.ObjectModel;
class GFG {
public static void Main()
{
Collection< string > myColl = new Collection< string >();
myColl.Add( "A" );
myColl.Add( "B" );
myColl.Add( "C" );
myColl.Add( "D" );
myColl.Add( "E" );
Console.WriteLine( "Count : " + myColl.Count);
foreach ( string str in myColl)
{
Console.WriteLine(str);
}
myColl.Remove( "C" );
Console.WriteLine( "Count : " + myColl.Count);
foreach ( string str in myColl)
{
Console.WriteLine(str);
}
}
}
|
Output:
Count : 5
A
B
C
D
E
Count : 4
A
B
D
E
Example 2:
using System;
using System.Collections.Generic;
using System.Collections.ObjectModel;
class GFG {
public static void Main()
{
Collection< int > myColl = new Collection< int >();
myColl.Add(2);
myColl.Add(3);
myColl.Add(4);
myColl.Add(4);
myColl.Add(5);
Console.WriteLine( "Count : " + myColl.Count);
foreach ( int i in myColl)
{
Console.WriteLine(i);
}
myColl.Remove(4);
Console.WriteLine( "Count : " + myColl.Count);
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:
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