ArrayList.InsertRange(Int32, ICollection) Metoda
Definicja
Ważne
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Wstawia elementy kolekcji do ArrayList określonego indeksu.
public:
virtual void InsertRange(int index, System::Collections::ICollection ^ c);
public virtual void InsertRange (int index, System.Collections.ICollection c);
abstract member InsertRange : int * System.Collections.ICollection -> unit
override this.InsertRange : int * System.Collections.ICollection -> unit
Public Overridable Sub InsertRange (index As Integer, c As ICollection)
Parametry
- index
- Int32
Indeks oparty na zera, w którym należy wstawić nowe elementy.
Których ICollection elementy należy wstawić do elementu ArrayList. Sama kolekcja nie może być null
wartością , ale może zawierać elementy, które są null
.
Wyjątki
c
to null
.
Przykłady
Poniższy przykład kodu pokazuje, jak wstawić elementy do elementu ArrayList.
using namespace System;
using namespace System::Collections;
void PrintValues( IEnumerable^ myList );
int main()
{
// Creates and initializes a new ArrayList using Insert instead of Add.
ArrayList^ myAL = gcnew ArrayList;
myAL->Insert( 0, "The" );
myAL->Insert( 1, "fox" );
myAL->Insert( 2, "jumps" );
myAL->Insert( 3, "over" );
myAL->Insert( 4, "the" );
myAL->Insert( 5, "dog" );
// Creates and initializes a new Queue.
Queue^ myQueue = gcnew Queue;
myQueue->Enqueue( "quick" );
myQueue->Enqueue( "brown" );
// Displays the ArrayList and the Queue.
Console::WriteLine( "The ArrayList initially contains the following:" );
PrintValues( myAL );
Console::WriteLine( "The Queue initially contains the following:" );
PrintValues( myQueue );
// Copies the Queue elements to the ArrayList at index 1.
myAL->InsertRange( 1, myQueue );
// Displays the ArrayList.
Console::WriteLine( "After adding the Queue, the ArrayList now contains:" );
PrintValues( myAL );
// Search for "dog" and add "lazy" before it.
myAL->Insert( myAL->IndexOf( "dog" ), "lazy" );
// Displays the ArrayList.
Console::WriteLine( "After adding \"lazy\", the ArrayList now contains:" );
PrintValues( myAL );
// Add "!!!" at the end.
myAL->Insert( myAL->Count, "!!!" );
// Displays the ArrayList.
Console::WriteLine( "After adding \"!!!\", the ArrayList now contains:" );
PrintValues( myAL );
// Inserting an element beyond Count throws an exception.
try
{
myAL->Insert( myAL->Count + 1, "anystring" );
}
catch ( Exception^ myException )
{
Console::WriteLine( "Exception: {0}", myException );
}
}
void PrintValues( IEnumerable^ myList )
{
IEnumerator^ myEnum = myList->GetEnumerator();
while ( myEnum->MoveNext() )
{
Object^ obj = safe_cast<Object^>(myEnum->Current);
Console::Write( " {0}", obj );
}
Console::WriteLine();
}
/*
This code produces the following output.
The ArrayList initially contains the following:
The fox jumps over the dog
The Queue initially contains the following:
quick brown
After adding the Queue, the ArrayList now contains:
The quick brown fox jumps over the dog
After adding "lazy", the ArrayList now contains:
The quick brown fox jumps over the lazy dog
After adding "!!!", the ArrayList now contains:
The quick brown fox jumps over the lazy dog !!!
Exception: System.ArgumentOutOfRangeException: Insertion index was out of range. Must be non-negative and less than or equal to size.
Parameter name: index
at System.Collections.ArrayList.Insert(Int32 index, Object value)
at SamplesArrayList.Main()
*/
using System;
using System.Collections;
public class SamplesArrayList {
public static void Main() {
// Creates and initializes a new ArrayList using Insert instead of Add.
ArrayList myAL = new ArrayList();
myAL.Insert( 0, "The" );
myAL.Insert( 1, "fox" );
myAL.Insert( 2, "jumps" );
myAL.Insert( 3, "over" );
myAL.Insert( 4, "the" );
myAL.Insert( 5, "dog" );
// Creates and initializes a new Queue.
Queue myQueue = new Queue();
myQueue.Enqueue( "quick" );
myQueue.Enqueue( "brown" );
// Displays the ArrayList and the Queue.
Console.WriteLine( "The ArrayList initially contains the following:" );
PrintValues( myAL );
Console.WriteLine( "The Queue initially contains the following:" );
PrintValues( myQueue );
// Copies the Queue elements to the ArrayList at index 1.
myAL.InsertRange( 1, myQueue );
// Displays the ArrayList.
Console.WriteLine( "After adding the Queue, the ArrayList now contains:" );
PrintValues( myAL );
// Search for "dog" and add "lazy" before it.
myAL.Insert( myAL.IndexOf( "dog" ), "lazy" );
// Displays the ArrayList.
Console.WriteLine( "After adding \"lazy\", the ArrayList now contains:" );
PrintValues( myAL );
// Add "!!!" at the end.
myAL.Insert( myAL.Count, "!!!" );
// Displays the ArrayList.
Console.WriteLine( "After adding \"!!!\", the ArrayList now contains:" );
PrintValues( myAL );
// Inserting an element beyond Count throws an exception.
try {
myAL.Insert( myAL.Count+1, "anystring" );
} catch ( Exception myException ) {
Console.WriteLine("Exception: " + myException.ToString());
}
}
public static void PrintValues( IEnumerable myList ) {
foreach ( Object obj in myList )
Console.Write( " {0}", obj );
Console.WriteLine();
}
}
/*
This code produces the following output.
The ArrayList initially contains the following:
The fox jumps over the dog
The Queue initially contains the following:
quick brown
After adding the Queue, the ArrayList now contains:
The quick brown fox jumps over the dog
After adding "lazy", the ArrayList now contains:
The quick brown fox jumps over the lazy dog
After adding "!!!", the ArrayList now contains:
The quick brown fox jumps over the lazy dog !!!
Exception: System.ArgumentOutOfRangeException: Insertion index was out of range. Must be non-negative and less than or equal to size.
Parameter name: index
at System.Collections.ArrayList.Insert(int index, Object value)
at SamplesArrayList.Main()
*/
Imports System.Collections
Public Class SamplesArrayList
Public Shared Sub Main()
' Creates and initializes a new ArrayList using Insert instead of Add.
Dim myAL As New ArrayList()
myAL.Insert(0, "The")
myAL.Insert(1, "fox")
myAL.Insert(2, "jumps")
myAL.Insert(3, "over")
myAL.Insert(4, "the")
myAL.Insert(5, "dog")
' Creates and initializes a new Queue.
Dim myQueue As New Queue()
myQueue.Enqueue("quick")
myQueue.Enqueue("brown")
' Displays the ArrayList and the Queue.
Console.WriteLine("The ArrayList initially contains the following:")
PrintValues(myAL)
Console.WriteLine("The Queue initially contains the following:")
PrintValues(myQueue)
' Copies the Queue elements to the ArrayList at index 1.
myAL.InsertRange(1, myQueue)
' Displays the ArrayList.
Console.WriteLine("After adding the Queue, the ArrayList now contains:")
PrintValues(myAL)
' Search for "dog" and add "lazy" before it.
myAL.Insert(myAL.IndexOf("dog"), "lazy")
' Displays the ArrayList.
Console.WriteLine("After adding ""lazy"", the ArrayList now contains:")
PrintValues(myAL)
' Add "!!!" at the end.
myAL.Insert(myAL.Count, "!!!")
' Displays the ArrayList.
Console.WriteLine("After adding ""!!!"", the ArrayList now contains:")
PrintValues(myAL)
' Inserting an element beyond Count throws an exception.
Try
myAL.Insert(myAL.Count + 1, "anystring")
Catch myException As Exception
Console.WriteLine("Exception: " + myException.ToString())
End Try
End Sub
Public Shared Sub PrintValues(myList As IEnumerable)
Dim obj As [Object]
For Each obj In myList
Console.Write(" {0}", obj)
Next obj
Console.WriteLine()
End Sub
End Class
' This code produces the following output.
'
' The ArrayList initially contains the following:
' The fox jumps over the dog
' The Queue initially contains the following:
' quick brown
' After adding the Queue, the ArrayList now contains:
' The quick brown fox jumps over the dog
' After adding "lazy", the ArrayList now contains:
' The quick brown fox jumps over the lazy dog
' After adding "!!!", the ArrayList now contains:
' The quick brown fox jumps over the lazy dog !!!
' Exception: System.ArgumentOutOfRangeException: Insertion index was out of range. Must be non-negative and less than or equal to size.
' Parameter name: index
' at System.Collections.ArrayList.Insert(Int32 index, Object value)
' at SamplesArrayList.Main()
Uwagi
ArrayListnull
akceptuje jako prawidłową wartość i zezwala na zduplikowane elementy.
Jeśli nowy Count (bieżący Count plus rozmiar kolekcji) będzie większy niż Capacity, pojemność ArrayList obiektu zostanie zwiększona przez automatyczne cofnięcie przydziału tablicy wewnętrznej w celu uwzględnienia nowych elementów, a istniejące elementy zostaną skopiowane do nowej tablicy przed dodaniu nowych elementów.
Jeśli index
wartość jest równa Count, elementy są dodawane na końcu elementu ArrayList.
Kolejność elementów w elemecie ICollection jest zachowywana w elemecie ArrayList.
W kolekcjach elementów sąsiadujących, takich jak listy, elementy umieszczone po punkcie wstawienia przesuwają się w dół, aby zwolnić miejsce na nowy element. Jeśli kolekcja jest indeksowana, indeksy przeniesionych elementów również są aktualizowane. To zachowanie nie dotyczy kolekcji, w których elementy są pod względem koncepcyjnym pogrupowane w przedziały, np. tablic skrótów.
Ta metoda jest operacją O(n + m)
, gdzie n
jest liczbą elementów do dodania i m
jest Count.