ArrayList.ToArray Método
Definição
Sobrecargas
| ToArray() |
Copia os elementos do ArrayList em uma nova matriz Object.Copies the elements of the ArrayList to a new Object array. |
| ToArray(Type) |
Copia os elementos do ArrayList em uma nova matriz do tipo de elemento especificado.Copies the elements of the ArrayList to a new array of the specified element type. |
ToArray()
public:
virtual cli::array <System::Object ^> ^ ToArray();
public virtual object[] ToArray ();
public virtual object?[] ToArray ();
abstract member ToArray : unit -> obj[]
override this.ToArray : unit -> obj[]
Public Overridable Function ToArray () As Object()
Retornos
- Object[]
Uma matriz Object que contém cópias dos elementos do ArrayList.An Object array containing copies of the elements of the ArrayList.
Comentários
Os elementos são copiados usando Array.Copy , que é uma O(n) operação, onde n é Count .The elements are copied using Array.Copy, which is an O(n) operation, where n is Count.
Aplica-se a
ToArray(Type)
public:
virtual Array ^ ToArray(Type ^ type);
public virtual Array ToArray (Type type);
abstract member ToArray : Type -> Array
override this.ToArray : Type -> Array
Public Overridable Function ToArray (type As Type) As Array
Parâmetros
- type
- Type
O elemento Type da matriz de destino para criação e cópia dos elementos.The element Type of the destination array to create and copy elements to.
Retornos
Uma matriz do tipo de elemento especificado que contém cópias dos elementos do ArrayList.An array of the specified element type containing copies of the elements of the ArrayList.
Exceções
type é null.type is null.
O tipo do ArrayList de origem não pode ser convertido automaticamente no tipo especificado.The type of the source ArrayList cannot be cast automatically to the specified type.
Exemplos
O exemplo de cópia a seguir mostra como copiar os elementos de um ArrayList para uma matriz de cadeia de caracteres.The following copy example shows how to copy the elements of an ArrayList to a string array.
using namespace System;
using namespace System::Collections;
void PrintIndexAndValues( ArrayList^ myList );
void PrintIndexAndValues( array<String^>^myArr );
int main()
{
// Creates and initializes a new ArrayList.
ArrayList^ myAL = gcnew ArrayList;
myAL->Add( "The" );
myAL->Add( "quick" );
myAL->Add( "brown" );
myAL->Add( "fox" );
myAL->Add( "jumps" );
myAL->Add( "over" );
myAL->Add( "the" );
myAL->Add( "lazy" );
myAL->Add( "dog" );
// Displays the values of the ArrayList.
Console::WriteLine( "The ArrayList contains the following values:" );
PrintIndexAndValues( myAL );
// Copies the elements of the ArrayList to a string array.
array<String^>^myArr = reinterpret_cast<array<String^>^>(myAL->ToArray( String::typeid ));
// Displays the contents of the string array.
Console::WriteLine( "The string array contains the following values:" );
PrintIndexAndValues( myArr );
}
void PrintIndexAndValues( ArrayList^ myList )
{
int i = 0;
IEnumerator^ myEnum = myList->GetEnumerator();
while ( myEnum->MoveNext() )
{
Object^ o = safe_cast<Object^>(myEnum->Current);
Console::WriteLine( "\t[{0}]:\t{1}", i++, o );
}
Console::WriteLine();
}
void PrintIndexAndValues( array<String^>^myArr )
{
for ( int i = 0; i < myArr->Length; i++ )
Console::WriteLine( "\t[{0}]:\t{1}", i, myArr[ i ] );
Console::WriteLine();
}
/*
This code produces the following output.
The ArrayList contains the following values:
[0]: The
[1]: quick
[2]: brown
[3]: fox
[4]: jumps
[5]: over
[6]: the
[7]: lazy
[8]: dog
The string array contains the following values:
[0]: The
[1]: quick
[2]: brown
[3]: fox
[4]: jumps
[5]: over
[6]: the
[7]: lazy
[8]: dog
*/
using System;
using System.Collections;
public class SamplesArrayList {
public static void Main() {
// Creates and initializes a new ArrayList.
ArrayList myAL = new ArrayList();
myAL.Add( "The" );
myAL.Add( "quick" );
myAL.Add( "brown" );
myAL.Add( "fox" );
myAL.Add( "jumps" );
myAL.Add( "over" );
myAL.Add( "the" );
myAL.Add( "lazy" );
myAL.Add( "dog" );
// Displays the values of the ArrayList.
Console.WriteLine( "The ArrayList contains the following values:" );
PrintIndexAndValues( myAL );
// Copies the elements of the ArrayList to a string array.
String[] myArr = (String[]) myAL.ToArray( typeof( string ) );
// Displays the contents of the string array.
Console.WriteLine( "The string array contains the following values:" );
PrintIndexAndValues( myArr );
}
public static void PrintIndexAndValues( ArrayList myList ) {
int i = 0;
foreach ( Object o in myList )
Console.WriteLine( "\t[{0}]:\t{1}", i++, o );
Console.WriteLine();
}
public static void PrintIndexAndValues( String[] myArr ) {
for ( int i = 0; i < myArr.Length; i++ )
Console.WriteLine( "\t[{0}]:\t{1}", i, myArr[i] );
Console.WriteLine();
}
}
/*
This code produces the following output.
The ArrayList contains the following values:
[0]: The
[1]: quick
[2]: brown
[3]: fox
[4]: jumps
[5]: over
[6]: the
[7]: lazy
[8]: dog
The string array contains the following values:
[0]: The
[1]: quick
[2]: brown
[3]: fox
[4]: jumps
[5]: over
[6]: the
[7]: lazy
[8]: dog
*/
Imports System.Collections
Public Class SamplesArrayList
Public Shared Sub Main()
' Creates and initializes a new ArrayList.
Dim myAL As New ArrayList()
myAL.Add("The")
myAL.Add("quick")
myAL.Add("brown")
myAL.Add("fox")
myAL.Add("jumps")
myAL.Add("over")
myAL.Add("the")
myAL.Add("lazy")
myAL.Add("dog")
' Displays the values of the ArrayList.
Console.WriteLine("The ArrayList contains the following values:")
PrintIndexAndValues(myAL)
' Copies the elements of the ArrayList to a string array.
Dim myArr As String() = CType(myAL.ToArray(GetType(String)), String())
' Displays the contents of the string array.
Console.WriteLine("The string array contains the following values:")
PrintIndexAndValues(myArr)
End Sub
Overloads Public Shared Sub PrintIndexAndValues(myList As ArrayList)
Dim i As Integer = 0
Dim o As [Object]
For Each o In myList
Console.WriteLine(" [{0}]: {1}", i, o)
i = i + 1
Next o
Console.WriteLine()
End Sub
Overloads Public Shared Sub PrintIndexAndValues(myArr() As String)
Dim i As Integer
For i = 0 To myArr.Length - 1
Console.WriteLine(" [{0}]: {1}", i, myArr(i))
Next i
Console.WriteLine()
End Sub
End Class
'This code produces the following output.
'
'The ArrayList contains the following values:
' [0]: The
' [1]: quick
' [2]: brown
' [3]: fox
' [4]: jumps
' [5]: over
' [6]: the
' [7]: lazy
' [8]: dog
'
'The string array contains the following values:
' [0]: The
' [1]: quick
' [2]: brown
' [3]: fox
' [4]: jumps
' [5]: over
' [6]: the
' [7]: lazy
' [8]: dog
Comentários
Todos os objetos no ArrayList objeto serão convertidos para o Type especificado no type parâmetro.All of the objects in the ArrayList object will be cast to the Type specified in the type parameter.
Os elementos são copiados usando Array.Copy , que é uma O(n) operação, onde n é Count .The elements are copied using Array.Copy, which is an O(n) operation, where n is Count.