SortedList.TrimToSize Methode
Definitie
Belangrijk
Bepaalde informatie heeft betrekking op een voorlopige productversie die aanzienlijk kan worden gewijzigd voordat deze wordt uitgebracht. Microsoft biedt geen enkele expliciete of impliciete garanties met betrekking tot de informatie die hier wordt verstrekt.
Hiermee stelt u de capaciteit in op het werkelijke aantal elementen in een SortedList object.
public:
virtual void TrimToSize();public virtual void TrimToSize();abstract member TrimToSize : unit -> unit
override this.TrimToSize : unit -> unitPublic Overridable Sub TrimToSize ()Uitzonderingen
Voorbeelden
In het volgende codevoorbeeld ziet u hoe u de ongebruikte gedeelten van een SortedList object kunt knippen en hoe u de waarden kunt wissen.
using System;
using System.Collections;
public class SamplesSortedList {
public static void Main() {
// Creates and initializes a new SortedList.
SortedList mySL = new SortedList();
mySL.Add( "one", "The" );
mySL.Add( "two", "quick" );
mySL.Add( "three", "brown" );
mySL.Add( "four", "fox" );
mySL.Add( "five", "jumps" );
// Displays the count, capacity and values of the SortedList.
Console.WriteLine( "Initially," );
Console.WriteLine( " Count : {0}", mySL.Count );
Console.WriteLine( " Capacity : {0}", mySL.Capacity );
Console.WriteLine( " Values:" );
PrintKeysAndValues( mySL );
// Trims the SortedList.
mySL.TrimToSize();
// Displays the count, capacity and values of the SortedList.
Console.WriteLine( "After TrimToSize," );
Console.WriteLine( " Count : {0}", mySL.Count );
Console.WriteLine( " Capacity : {0}", mySL.Capacity );
Console.WriteLine( " Values:" );
PrintKeysAndValues( mySL );
// Clears the SortedList.
mySL.Clear();
// Displays the count, capacity and values of the SortedList.
Console.WriteLine( "After Clear," );
Console.WriteLine( " Count : {0}", mySL.Count );
Console.WriteLine( " Capacity : {0}", mySL.Capacity );
Console.WriteLine( " Values:" );
PrintKeysAndValues( mySL );
// Trims the SortedList again.
mySL.TrimToSize();
// Displays the count, capacity and values of the SortedList.
Console.WriteLine( "After the second TrimToSize," );
Console.WriteLine( " Count : {0}", mySL.Count );
Console.WriteLine( " Capacity : {0}", mySL.Capacity );
Console.WriteLine( " Values:" );
PrintKeysAndValues( mySL );
}
public static void PrintKeysAndValues( SortedList myList ) {
Console.WriteLine( "\t-KEY-\t-VALUE-" );
for ( int i = 0; i < myList.Count; i++ ) {
Console.WriteLine( "\t{0}:\t{1}", myList.GetKey(i), myList.GetByIndex(i) );
}
Console.WriteLine();
}
}
/*
This code produces the following output.
Initially,
Count : 5
Capacity : 16
Values:
-KEY- -VALUE-
five: jumps
four: fox
one: The
three: brown
two: quick
After TrimToSize,
Count : 5
Capacity : 5
Values:
-KEY- -VALUE-
five: jumps
four: fox
one: The
three: brown
two: quick
After Clear,
Count : 0
Capacity : 16
Values:
-KEY- -VALUE-
After the second TrimToSize,
Count : 0
Capacity : 16
Values:
-KEY- -VALUE-
*/
Imports System.Collections
Public Class SamplesSortedList
Public Shared Sub Main()
' Creates and initializes a new SortedList.
Dim mySL As New SortedList()
mySL.Add("one", "The")
mySL.Add("two", "quick")
mySL.Add("three", "brown")
mySL.Add("four", "fox")
mySL.Add("five", "jumps")
' Displays the count, capacity and values of the SortedList.
Console.WriteLine("Initially,")
Console.WriteLine(" Count : {0}", mySL.Count)
Console.WriteLine(" Capacity : {0}", mySL.Capacity)
Console.WriteLine(" Values:")
PrintKeysAndValues(mySL)
' Trims the SortedList.
mySL.TrimToSize()
' Displays the count, capacity and values of the SortedList.
Console.WriteLine("After TrimToSize,")
Console.WriteLine(" Count : {0}", mySL.Count)
Console.WriteLine(" Capacity : {0}", mySL.Capacity)
Console.WriteLine(" Values:")
PrintKeysAndValues(mySL)
' Clears the SortedList.
mySL.Clear()
' Displays the count, capacity and values of the SortedList.
Console.WriteLine("After Clear,")
Console.WriteLine(" Count : {0}", mySL.Count)
Console.WriteLine(" Capacity : {0}", mySL.Capacity)
Console.WriteLine(" Values:")
PrintKeysAndValues(mySL)
' Trims the SortedList again.
mySL.TrimToSize()
' Displays the count, capacity and values of the SortedList.
Console.WriteLine("After the second TrimToSize,")
Console.WriteLine(" Count : {0}", mySL.Count)
Console.WriteLine(" Capacity : {0}", mySL.Capacity)
Console.WriteLine(" Values:")
PrintKeysAndValues(mySL)
End Sub
Public Shared Sub PrintKeysAndValues(myList As SortedList)
Console.WriteLine(ControlChars.Tab & "-KEY-" & ControlChars.Tab & _
"-VALUE-")
Dim i As Integer
For i = 0 To myList.Count - 1
Console.WriteLine(ControlChars.Tab & "{0}:" & ControlChars.Tab & _
"{1}", myList.GetKey(i), myList.GetByIndex(i))
Next i
Console.WriteLine()
End Sub
End Class
' This code produces the following output.
'
' Initially,
' Count : 5
' Capacity : 16
' Values:
' -KEY- -VALUE-
' five: jumps
' four: fox
' one: The
' three: brown
' two: quick
'
' After TrimToSize,
' Count : 5
' Capacity : 5
' Values:
' -KEY- -VALUE-
' five: jumps
' four: fox
' one: The
' three: brown
' two: quick
'
' After Clear,
' Count : 0
' Capacity : 16
' Values:
' -KEY- -VALUE-
'
'
' After the second TrimToSize,
' Count : 0
' Capacity : 16
' Values:
' -KEY- -VALUE-
Opmerkingen
Deze methode kan worden gebruikt om de geheugenoverhead van een verzameling te minimaliseren als er geen nieuwe elementen aan de verzameling worden toegevoegd.
Als u een SortedList object opnieuw wilt instellen in de oorspronkelijke status, roept u de Clear methode aan voordat u het aanroept TrimToSize. Als u een lege SortedList functie bijwerkt, wordt de capaciteit van de SortedList standaardcapaciteit ingesteld.
Deze methode is een O(n) bewerking, waarbij n .Count