SortedList.Clear Metoda
Definice
Důležité
Některé informace platí pro předběžně vydaný produkt, který se může zásadně změnit, než ho výrobce nebo autor vydá. Microsoft neposkytuje žádné záruky, výslovné ani předpokládané, týkající se zde uváděných informací.
Odebere všechny prvky z objektu SortedList .
public:
virtual void Clear();public virtual void Clear ();abstract member Clear : unit -> unit
override this.Clear : unit -> unitPublic Overridable Sub Clear ()Implementuje
Výjimky
Příklady
Následující příklad kódu ukazuje, jak oříznout nepoužívané části objektu SortedList a jak vymazat hodnoty objektu SortedList.
#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-
Poznámky
Count je nastavená na nulu a uvolní se také odkazy na jiné objekty z prvků kolekce.
Capacity zůstává beze změny. Pokud chcete obnovit kapacitu objektu SortedList , zavolejte TrimToSize nebo nastavte Capacity vlastnost přímo. Oříznutí prázdné SortedList nastaví kapacitu objektu SortedList na výchozí kapacitu.
Tato metoda je O(n) operace, kde n je Count.
Platí pro
Viz také
Spolupracujte s námi na GitHubu
Zdroj tohoto obsahu najdete na GitHubu, kde můžete také vytvářet a kontrolovat problémy a žádosti o přijetí změn. Další informace najdete v našem průvodci pro přispěvatele.
