BitArray.Set(Int32, Boolean) Method

Reference

Definition

Namespace:: System.Collections

Assembly:: System.Collections.dll

Assembly:: mscorlib.dll

Assembly:: netstandard.dll

Source:: BitArray.cs

Source:: BitArray.cs

Source:: BitArray.cs

Important

Some information relates to prerelease product that may be substantially modified before it’s released. Microsoft makes no warranties, express or implied, with respect to the information provided here.

Sets the bit at a specific position in the BitArray to the specified value.

public:
 void Set(int index, bool value);

public void Set (int index, bool value);

member this.Set : int * bool -> unit

Public Sub Set (index As Integer, value As Boolean)

Parameters

index: Int32

The zero-based index of the bit to set.

value: Boolean

The Boolean value to assign to the bit.

Exceptions

ArgumentOutOfRangeException

index is less than zero.

-or-

index is greater than or equal to the number of elements in the BitArray.

Examples

The following code example shows how to set and get specific elements in a BitArray.

using namespace System;
using namespace System::Collections;
void PrintIndexAndValues( IEnumerable^ myCol );
int main()
{
   
   // Creates and initializes a BitArray.
   BitArray^ myBA = gcnew BitArray( 5 );
   
   // Displays the properties and values of the BitArray.
   Console::WriteLine( "myBA values:" );
   PrintIndexAndValues( myBA );
   
   // Sets all the elements to true.
   myBA->SetAll( true );
   
   // Displays the properties and values of the BitArray.
   Console::WriteLine( "After setting all elements to true," );
   PrintIndexAndValues( myBA );
   
   // Sets the last index to false.
   myBA->Set( myBA->Count - 1, false );
   
   // Displays the properties and values of the BitArray.
   Console::WriteLine( "After setting the last element to false," );
   PrintIndexAndValues( myBA );
   
   // Gets the value of the last two elements.
   Console::WriteLine( "The last two elements are: " );
   Console::WriteLine( "    at index {0} : {1}", myBA->Count - 2, myBA->Get( myBA->Count - 2 ) );
   Console::WriteLine( "    at index {0} : {1}", myBA->Count - 1, myBA->Get( myBA->Count - 1 ) );
}

void PrintIndexAndValues( IEnumerable^ myCol )
{
   int i = 0;
   IEnumerator^ myEnum = myCol->GetEnumerator();
   while ( myEnum->MoveNext() )
   {
      Object^ obj = safe_cast<Object^>(myEnum->Current);
      Console::WriteLine( "    [{0}]:    {1}", i++, obj );
   }

   Console::WriteLine();
}

/* 
 This code produces the following output.
 
 myBA values:
     [0]:    False
     [1]:    False
     [2]:    False
     [3]:    False
     [4]:    False

 After setting all elements to true,
     [0]:    True
     [1]:    True
     [2]:    True
     [3]:    True
     [4]:    True

 After setting the last element to false,
     [0]:    True
     [1]:    True
     [2]:    True
     [3]:    True
     [4]:    False

 The last two elements are:
     at index 3 : True
     at index 4 : False

 */

using System;
using System.Collections;
public class SamplesBitArray  {

   public static void Main()  {

      // Creates and initializes a BitArray.
      BitArray myBA = new BitArray( 5 );

      // Displays the properties and values of the BitArray.
      Console.WriteLine( "myBA values:" );
      PrintIndexAndValues( myBA );

      // Sets all the elements to true.
      myBA.SetAll( true );

      // Displays the properties and values of the BitArray.
      Console.WriteLine( "After setting all elements to true," );
      PrintIndexAndValues( myBA );

      // Sets the last index to false.
      myBA.Set( myBA.Count - 1, false );

      // Displays the properties and values of the BitArray.
      Console.WriteLine( "After setting the last element to false," );
      PrintIndexAndValues( myBA );

      // Gets the value of the last two elements.
      Console.WriteLine( "The last two elements are: " );
      Console.WriteLine( "    at index {0} : {1}", myBA.Count - 2, myBA.Get( myBA.Count - 2 ) );
      Console.WriteLine( "    at index {0} : {1}", myBA.Count - 1, myBA.Get( myBA.Count - 1 ) );
   }

   public static void PrintIndexAndValues( IEnumerable myCol )  {
      int i = 0;
      foreach ( Object obj in myCol ) {
         Console.WriteLine( "    [{0}]:    {1}", i++, obj );
      }
      Console.WriteLine();
   }
}
/*
This code produces the following output.

myBA values:
    [0]:    False
    [1]:    False
    [2]:    False
    [3]:    False
    [4]:    False

After setting all elements to true,
    [0]:    True
    [1]:    True
    [2]:    True
    [3]:    True
    [4]:    True

After setting the last element to false,
    [0]:    True
    [1]:    True
    [2]:    True
    [3]:    True
    [4]:    False

The last two elements are:
    at index 3 : True
    at index 4 : False

*/

Imports System.Collections

Public Class SamplesBitArray    
    
    Public Shared Sub Main()
        
        ' Creates and initializes a BitArray.
        Dim myBA As New BitArray(5)
        
        ' Displays the properties and values of the BitArray.
        Console.WriteLine("myBA values:")
        PrintIndexAndValues(myBA)
        
        ' Sets all the elements to true.
        myBA.SetAll(True)
        
        ' Displays the properties and values of the BitArray.
        Console.WriteLine("After setting all elements to true,")
        PrintIndexAndValues(myBA)
        
        ' Sets the last index to false.
        myBA.Set(myBA.Count - 1, False)
        
        ' Displays the properties and values of the BitArray.
        Console.WriteLine("After setting the last element to false,")
        PrintIndexAndValues(myBA)
        
        ' Gets the value of the last two elements.
        Console.WriteLine("The last two elements are: ")
        Console.WriteLine("    at index {0} : {1}", _
           myBA.Count - 2, myBA.Get(myBA.Count - 2))
        Console.WriteLine("    at index {0} : {1}", _
           myBA.Count - 1, myBA.Get(myBA.Count - 1))
    End Sub

    Public Shared Sub PrintIndexAndValues(myCol As IEnumerable)
        Dim i As Integer
        Dim obj As Object
        i = 0
        For Each obj In  myCol
            Console.WriteLine("    [{0}]:    {1}", i, obj)
            i = i + 1
        Next obj
        Console.WriteLine()
    End Sub

End Class

' This code produces the following output.
' 
' myBA values:
'     [0]:    False
'     [1]:    False
'     [2]:    False
'     [3]:    False
'     [4]:    False
' 
' After setting all elements to true,
'     [0]:    True
'     [1]:    True
'     [2]:    True
'     [3]:    True
'     [4]:    True
' 
' After setting the last element to false,
'     [0]:    True
'     [1]:    True
'     [2]:    True
'     [3]:    True
'     [4]:    False
' 
' The last two elements are:
'     at index 3 : True
'     at index 4 : False

Remarks

This method is an O(1) operation.

Applies to

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