Queue.Clear Method

public:
 virtual void Clear();

public virtual void Clear();

abstract member Clear : unit -> unit
override this.Clear : unit -> unit

Public Overridable Sub Clear ()

Examples

The following example shows how to clear the values of the Queue.

using System;
using System.Collections;
public class SamplesQueue {

 public static void Main() {

 // Creates and initializes a new Queue.
 Queue myQ = new Queue();
 myQ.Enqueue( "The" );
 myQ.Enqueue( "quick" );
 myQ.Enqueue( "brown" );
 myQ.Enqueue( "fox" );
 myQ.Enqueue( "jumps" );

 // Displays the count and values of the Queue.
 Console.WriteLine( "Initially," );
 Console.WriteLine( " Count : {0}", myQ.Count );
 Console.Write( " Values:" );
 PrintValues( myQ );

 // Clears the Queue.
 myQ.Clear();

 // Displays the count and values of the Queue.
 Console.WriteLine( "After Clear," );
 Console.WriteLine( " Count : {0}", myQ.Count );
 Console.Write( " Values:" );
 PrintValues( myQ );
 }

 public static void PrintValues( Queue myQ ) {
 foreach ( Object myObj in myQ ) {
 Console.Write( " {0}", myObj );
 }
 Console.WriteLine();
 }
}
/*
This code produces the following output.

Initially,
 Count : 5
 Values: The quick brown fox jumps
After Clear,
 Count : 0
 Values:

*/

Imports System.Collections

Public Class SamplesQueue 
 
 Public Shared Sub Main()
 
 ' Creates and initializes a new Queue.
 Dim myQ As New Queue()
 myQ.Enqueue("The")
 myQ.Enqueue("quick")
 myQ.Enqueue("brown")
 myQ.Enqueue("fox")
 myQ.Enqueue("jumps")
 
 ' Displays the count and values of the Queue.
 Console.WriteLine("Initially,")
 Console.WriteLine(" Count : {0}", myQ.Count)
 Console.Write(" Values:")
 PrintValues(myQ)
 
 ' Clears the Queue.
 myQ.Clear()
 
 ' Displays the count and values of the Queue.
 Console.WriteLine("After Clear,")
 Console.WriteLine(" Count : {0}", myQ.Count)
 Console.Write(" Values:")
 PrintValues(myQ)
 End Sub
 
 Public Shared Sub PrintValues(myQ As Queue)
 Dim myObj As [Object]
 For Each myObj In myQ
 Console.Write(" {0}", myObj)
 Next myObj
 Console.WriteLine()
 End Sub

End Class


' This code produces the following output.
' 
' Initially,
' Count : 5
' Values: The quick brown fox jumps
' After Clear,
' Count : 0
' Values:

Remarks

Count is set to zero, and references to other objects from elements of the collection are also released.

The capacity remains unchanged. To reset the capacity of the Queue, call TrimToSize. Trimming an empty Queue sets the capacity of the Queue to the default capacity.

This method is an O(n) operation, where n is Count.

See also

• TrimToSize()