Array.Clear(Array, Int32, Int32) Array.Clear(Array, Int32, Int32) Array.Clear(Array, Int32, Int32) Method

Definición

Establece un intervalo de elementos de una matriz en el valor predeterminado de cada tipo de elemento.Sets a range of elements in an array to the default value of each element type.

public:
 static void Clear(Array ^ array, int index, int length);
public static void Clear (Array array, int index, int length);
static member Clear : Array * int * int -> unit

Parámetros

array
Array Array Array

La matriz cuyos elementos deben borrarse.The array whose elements need to be cleared.

index
Int32 Int32 Int32

Índice inicial del intervalo de elementos que se va a borrar.The starting index of the range of elements to clear.

length
Int32 Int32 Int32

Número de elementos que se van a borrar.The number of elements to clear.

Excepciones

index es menor que el límite inferior de array.index is less than the lower bound of array.

O bien-or- length es menor que cero.length is less than zero.

O bien-or- La suma de index y length es mayor que el tamaño de array.The sum of index and length is greater than the size of array.

Ejemplos

En el ejemplo siguiente se Clear usa el método para restablecer valores enteros en una matriz unidimensional, bidimensional y tridimensional.The following example uses the Clear method to reset integer values in a one-dimensional, two-dimensional, and three-dimensional array.

using System;

class Example
{
    public static void Main()
    {
        Console.WriteLine("One dimension (Rank=1):");
        int[] numbers1 = { 1, 2, 3, 4, 5, 6, 7, 8, 9 };

        for (int i = 0; i < 9; i++)
        {
            Console.Write("{0} ", numbers1[i]);
        }
        Console.WriteLine();
        Console.WriteLine();

        Console.WriteLine("Array.Clear(numbers1, 2, 5)");
        Array.Clear(numbers1, 2, 5);

        for (int i = 0; i < 9; i++)
        {
            Console.Write("{0} ", numbers1[i]);
        }
        Console.WriteLine();
        Console.WriteLine();

        Console.WriteLine("Two dimensions (Rank=2):");
        int[,] numbers2 = { { 1, 2, 3 }, { 4, 5, 6 }, { 7, 8, 9 } };

        for (int i = 0; i < 3; i++)
        {
            for (int j = 0; j < 3; j++)
            {
                Console.Write("{0} ", numbers2[i, j]);
            }
            Console.WriteLine();
        }

        Console.WriteLine();
        Console.WriteLine("Array.Clear(numbers2, 2, 5)");
        Array.Clear(numbers2, 2, 5);

        for (int i = 0; i < 3; i++)
        {
            for (int j = 0; j < 3; j++)
            {
                Console.Write("{0} ", numbers2[i, j]);
            }
            Console.WriteLine();
        }

        Console.WriteLine("Three dimensions (Rank=3):");
        int[, ,] numbers3 = {{{1, 2}, {3, 4}},
                             {{5, 6}, {7, 8}},
                             {{9, 10}, {11, 12}}};

        for (int i = 0; i < 2; i++)
        {
            for (int j = 0; j < 2; j++)
            {
                for (int k = 0; k < 2; k++)
                {
                    Console.Write("{0} ", numbers3[i, j, k]);
                }
                Console.WriteLine();
            }
            Console.WriteLine();
        }

        Console.WriteLine("Array.Clear(numbers3, 2, 5)");
        Array.Clear(numbers3, 2, 5);

        for (int i = 0; i < 2; i++)
        {
            for (int j = 0; j < 2; j++)
            {
                for (int k = 0; k < 2; k++)
                {
                    Console.Write("{0} ", numbers3[i, j, k]);
                }
                Console.WriteLine();
            }
            Console.WriteLine();
        }
    }
}
/*  This code example produces the following output:
 * 
 * One dimension (Rank=1):
 * 1 2 3 4 5 6 7 8 9
 * 
 * Array.Clear(numbers1, 2, 5)
 * 1 2 0 0 0 0 0 8 9
 * 
 * Two dimensions (Rank=2):
 * 1 2 3
 * 4 5 6
 * 7 8 9
 * 
 * Array.Clear(numbers2, 2, 5)
 * 1 2 0
 * 0 0 0
 * 0 8 9
 * 
 * Three dimensions (Rank=3):
 * 1 2
 * 3 4
 * 
 * 5 6
 * 7 8
 * 
 * Array.Clear(numbers3, 2, 5)
 * 1 2
 * 0 0
 * 
 * 0 0
 * 0 8
 */
Module Example
    Sub Main()
        Console.WriteLine(vbLf & "One dimension (Rank=1):")
        Dim numbers1() As Integer = {1, 2, 3, 4, 5, 6, 7, 8, 9}

        For i As Integer = 0 To 8
            Console.Write("{0} ", numbers1(i))
        Next 
        Console.WriteLine()

        Console.WriteLine(vbLf & "Array.Clear(numbers1, 2, 5)")
        Array.Clear(numbers1, 2, 5)

        For i As Integer = 0 To 8
            Console.Write("{0} ", numbers1(i))
        Next 
        Console.WriteLine()


        Console.WriteLine(vbLf & "Two dimensions (Rank=2):")
        Dim numbers2(,) As Integer = {{ 1, 2, 3 }, { 4, 5, 6 }, { 7, 8, 9 }}

        For i As Integer = 0 To 2
            For j As Integer = 0 To 2
                Console.Write("{0} ", numbers2(i, j))
            Next 
            Console.WriteLine()
        Next 

        Console.WriteLine(vbLf & "Array.Clear(numbers2, 2, 5)")
        Array.Clear(numbers2, 2, 5)

        For i As Integer = 0 To 2
            For j As Integer = 0 To 2
                Console.Write("{0} ", numbers2(i, j))
            Next 
            Console.WriteLine()
        Next 


        Console.WriteLine(vbLf & "Three dimensions (Rank=3):")
        Dim numbers3(,,) As Integer = {{{ 1, 2 }, { 3, 4 }}, _
                                       {{ 5, 6 }, { 7, 8 }}, _
                                       {{ 9, 10 }, { 11, 12 }}}

        For i As Integer = 0 To 1
            For j As Integer = 0 To 1
                For k As Integer = 0 To 1
                    Console.Write("{0} ", numbers3(i, j, k))
                Next 
                Console.WriteLine()
            Next 
            Console.WriteLine()
        Next 
        Console.WriteLine()
        
        Console.WriteLine("Array.Clear(numbers3, 2, 5)")
        Array.Clear(numbers3, 2, 5)

        For i As Integer = 0 To 1
            For j As Integer = 0 To 1
                For k As Integer = 0 To 1
                    Console.Write("{0} ", numbers3(i, j, k))
                Next 
                Console.WriteLine()
            Next 
            Console.WriteLine()
        Next 
    End Sub
End Module
' The example displays the following output:
'       One dimension (Rank=1):
'       1 2 3 4 5 6 7 8 9
'       
'       Array.Clear(numbers1, 2, 5)
'       1 2 0 0 0 0 0 8 9
'       
'       Two dimensions (Rank=2):
'       1 2 3
'       4 5 6
'       7 8 9
'       
'       Array.Clear(numbers2, 2, 5)
'       1 2 0
'       0 0 0
'       0 8 9
'       
'       Three dimensions (Rank=3):
'       1 2
'       3 4
'
'       5 6
'       7 8
'       
'       Array.Clear(numbers3, 2, 5)
'       1 2
'       0 0
'       
'       0 0
'       0 8

En el ejemplo siguiente se TimeZoneTime define una estructura que TimeZoneInfo incluye un campo DateTimeOffset y un campo.The following example defines a TimeZoneTime structure that includes a TimeZoneInfo field and a DateTimeOffset field. A continuación, llama Clear al método para borrar un elemento en una matriz de valores de TimeZoneTime dos elementos.It then calls the Clear method to clear one element in a two-element array of TimeZoneTime values. El método establece el valor del elemento borrado en el valor predeterminado de un TimeZoneInfo objeto, que es nully el valor predeterminado de un DateTimeOffset objeto, que es DateTimeOffset.MinValue.The method sets the value of the cleared element to the default value of a TimeZoneInfo object, which is null, and the default value of a DateTimeOffset object, which is DateTimeOffset.MinValue.

using System;

public struct TimeZoneTime
{
   private DateTimeOffset dt;
   private TimeZoneInfo tz;
   
   public TimeZoneTime(DateTimeOffset dateTime, TimeZoneInfo timeZone)
   {
      dt = dateTime;
      tz = timeZone;
   }

   public DateTimeOffset DateTime 
   { get { return dt; } }
   
   public TimeZoneInfo TimeZone 
   { get { return tz; } }
}

public class Example
{
   public static void Main()
   {
      // Declare an array with two elements.
      TimeZoneTime[] timeZoneTimes = { new TimeZoneTime(DateTime.Now, TimeZoneInfo.Local),
                                       new TimeZoneTime(DateTime.Now, TimeZoneInfo.Utc) };   
      foreach (var timeZoneTime in timeZoneTimes)
         Console.WriteLine("{0}: {1:G}", 
                           timeZoneTime.TimeZone == null ? "<null>" : timeZoneTime.TimeZone.ToString(), 
                           timeZoneTime.DateTime);
      Console.WriteLine();
      
      Array.Clear(timeZoneTimes, 1, 1);
      foreach (var timeZoneTime in timeZoneTimes)
         Console.WriteLine("{0}: {1:G}", 
                           timeZoneTime.TimeZone == null ? "<null>" : timeZoneTime.TimeZone.ToString(), 
                           timeZoneTime.DateTime);
   }
}
// The example displays the following output:
//       (UTC-08:00) Pacific Time (US & Canada): 1/20/2014 12:11:00 PM
//       UTC: 1/20/2014 12:11:00 PM
//       
//       (UTC-08:00) Pacific Time (US & Canada): 1/20/2014 12:11:00 PM
//       <null>: 1/1/0001 12:00:00 AM
Public Structure TimeZoneTime
   Private dt As DateTimeOffset
   Private tz As TimeZoneInfo
   
   Public Sub New(dateTime As DateTimeOffset, timeZone As TimeZoneInfo)
      dt = dateTime
      tz = timeZone
   End Sub

   Public ReadOnly Property DateTime As DateTimeOffset
      Get
         Return dt
      End Get
   End Property
   
   Public ReadOnly Property TimeZone As TimeZoneInfo
      Get
         Return tz
      End Get
   End Property 
End Structure

Module Example
   Public Sub Main()
      ' Declare an array with two elements.
      Dim timeZoneTimes() As TimeZoneTime = { New TimeZoneTime(Date.Now, TimeZoneInfo.Local),
                                              New TimeZoneTime(Date.Now, TimeZoneInfo.Utc) }   
      For Each timeZoneTime In timeZoneTimes
         Console.WriteLine("{0}: {1:G}", 
                           If(timeZoneTime.TimeZone Is Nothing, "<null>", timeZoneTime.TimeZone), 
                           timeZoneTime.DateTime)
      Next
      Console.WriteLine()
      
      Array.Clear(timeZoneTimes, 1, 1)
      For Each timeZoneTime In timeZoneTimes
         Console.WriteLine("{0}: {1:G}", 
                           If(timeZoneTime.TimeZone Is Nothing, "<null>", timeZoneTime.TimeZone), 
                           timeZoneTime.DateTime)
      Next
   End Sub
End Module
' The example displays output like the following:
'       (UTC-08:00) Pacific Time (US & Canada): 1/20/2014 12:11:00 PM
'       UTC: 1/20/2014 12:11:00 PM
'       
'       (UTC-08:00) Pacific Time (US & Canada): 1/20/2014 12:11:00 PM
'       <null>: 1/1/0001 12:00:00 AM

Comentarios

Este método restablece cada elemento de una matriz en el valor predeterminado del tipo de elemento.This method resets each element in an array to the element type's default value. Establece los elementos de los tipos de referencia String (incluidos los nullelementos) en y establece los elementos de tipos de valor en los valores predeterminados que se muestran en la tabla siguiente.It sets elements of reference types (including String elements) to null, and sets elements of value types to the default values shown in the following table.

TipoType ValorValue
Boolean false
Todos los tipos numéricos enteros y de punto flotanteAll integral and floating point numeric types 0 (cero)0 (zero)
DateTime DateTime.MinValue
Otros tipos de valorOther value types Valor predeterminado de los campos del tipo.Default value of the type's fields

El intervalo de elementos borrados se ajusta de fila a fila en una matriz multidimensional.The range of cleared elements wrap from row to row in a multi-dimensional array.

Este método solo borra los valores de los elementos; no elimina los propios elementos.This method only clears the values of the elements; it does not delete the elements themselves. Una matriz tiene un tamaño fijo; por lo tanto, no se pueden agregar ni quitar elementos.An array has a fixed size; therefore, elements cannot be added or removed.

Este método es una operación On(), donde n es length.This method is an O(n) operation, where n is length.

Se aplica a