SortedList.TrimToSize Méthode
Important
Certaines informations portent sur la préversion du produit qui est susceptible d’être en grande partie modifiée avant sa publication. Microsoft exclut toute garantie, expresse ou implicite, concernant les informations fournies ici.
Affecte à la capacité le nombre réel d'éléments d'un objet SortedList.
public:
virtual void TrimToSize();
public virtual void TrimToSize ();
abstract member TrimToSize : unit -> unit
override this.TrimToSize : unit -> unit
Public Overridable Sub TrimToSize ()
L’exemple de code suivant montre comment découper les parties inutilisées d’un SortedList objet et comment effacer ses valeurs.
#using <system.dll>
using namespace System;
using namespace System::Collections;
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();
}
int main()
{
// Creates and initializes a new SortedList.
SortedList^ mySL = gcnew 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 );
}
/*
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-
*/
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-
Cette méthode peut être utilisée pour réduire la surcharge de mémoire d’une collection si aucun nouvel élément n’est ajouté à la collection.
Pour rétablir l’état initial d’un SortedList objet, appelez la Clear méthode avant d’appeler TrimToSize. La suppression d’un vide SortedList définit la capacité du sur SortedList la capacité par défaut.
Cette méthode est une O(n)
opération, où n
est Count.
Produit | Versions |
---|---|
.NET | Core 1.0, Core 1.1, Core 2.0, Core 2.1, Core 2.2, Core 3.0, Core 3.1, 5, 6, 7, 8, 9 |
.NET Framework | 1.1, 2.0, 3.0, 3.5, 4.0, 4.5, 4.5.1, 4.5.2, 4.6, 4.6.1, 4.6.2, 4.7, 4.7.1, 4.7.2, 4.8, 4.8.1 |
.NET Standard | 2.0, 2.1 |
UWP | 10.0 |
Commentaires sur .NET
.NET est un projet open source. Sélectionnez un lien pour fournir des commentaires :