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Inglés

Método Array.AsReadOnly<T>(T[])

 

Devuelve un contenedor de solo lectura para la matriz especificada.

Espacio de nombres:   System
Ensamblado:  mscorlib (en mscorlib.dll)

public static ReadOnlyCollection<T> AsReadOnly<T>(
	T[] array
)

Parámetros

array
Type: T[]

Matriz unidimensional de base cero para ajustar en un contenedor ReadOnlyCollection<T> de solo lectura.

Valor devuelto

Type: System.Collections.ObjectModel.ReadOnlyCollection<T>

Contenedor ReadOnlyCollection<T> de solo lectura para la matriz especificada.

Parámetros de tipo

T

Tipo de los elementos de la matriz.

Exception Condition
ArgumentNullException

El valor de array es null.

To prevent any modifications to the array, expose the array only through this wrapper.

A collection that is read-only is simply a collection with a wrapper that prevents modifying the collection; therefore, if changes are made to the underlying collection, the read-only collection reflects those changes.

This method is an O(1) operation.

The following example wraps an array in a read-only T:System.Collections.ObjectModel.ReadOnlyCollection`1.

using System;
using System.Collections.Generic;

public class SamplesArray  {

   public static void Main()  {

      // Create and initialize a new string array.
      String[] myArr = { "The", "quick", "brown", "fox" };

      // Display the values of the array.
      Console.WriteLine( "The string array initially contains the following values:" );
      PrintIndexAndValues( myArr );

      // Create a read-only IList wrapper around the array.
      IList<String> myList = Array.AsReadOnly( myArr );

      // Display the values of the read-only IList.
      Console.WriteLine( "The read-only IList contains the following values:" );
      PrintIndexAndValues( myList );

      // Attempt to change a value through the wrapper.
      try  {
         myList[3] = "CAT";
      }
      catch ( NotSupportedException e )  {
         Console.WriteLine( "{0} - {1}", e.GetType(), e.Message );
         Console.WriteLine();
      }

      // Change a value in the original array.
      myArr[2] = "RED";

      // Display the values of the array.
      Console.WriteLine( "After changing the third element, the string array contains the following values:" );
      PrintIndexAndValues( myArr );

      // Display the values of the read-only IList.
      Console.WriteLine( "After changing the third element, the read-only IList contains the following values:" );
      PrintIndexAndValues( myList );

   }

   public static void PrintIndexAndValues( String[] myArr )  {
      for ( int i = 0; i < myArr.Length; i++ )  {
         Console.WriteLine( "   [{0}] : {1}", i, myArr[i] );
      }
      Console.WriteLine();
   }

   public static void PrintIndexAndValues( IList<String> myList )  {
      for ( int i = 0; i < myList.Count; i++ )  {
         Console.WriteLine( "   [{0}] : {1}", i, myList[i] );
      }
      Console.WriteLine();
   }

}


/* 
This code produces the following output.

The string array initially contains the following values:
   [0] : The
   [1] : quick
   [2] : brown
   [3] : fox

The read-only IList contains the following values:
   [0] : The
   [1] : quick
   [2] : brown
   [3] : fox

System.NotSupportedException - Collection is read-only.

After changing the third element, the string array contains the following values:
   [0] : The
   [1] : quick
   [2] : RED
   [3] : fox

After changing the third element, the read-only IList contains the following values:
   [0] : The
   [1] : quick
   [2] : RED
   [3] : fox

*/

.NET Framework
Disponible desde 2.0
Silverlight
Disponible desde 2.0
Windows Phone Silverlight
Disponible desde 7.0
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