CreateMask Method (Int32)
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BitVector32.CreateMask Method (Int32)

Creates an additional mask following the specified mask in a series of masks that can be used to retrieve individual bits in a BitVector32 that is set up as bit flags.

Namespace:  System.Collections.Specialized
Assembly:  System (in System.dll)

public static int CreateMask(
	int previous


Type: System.Int32

The mask that indicates the previous bit flag.

Return Value

Type: System.Int32
A mask that isolates the bit flag following the one that previous points to in BitVector32.


previous indicates the last bit flag in the BitVector32.

Use CreateMask() to create the first mask in a series and CreateMask(int) for all subsequent masks.

Multiple masks can be created to refer to the same bit flag.

The resulting mask isolates only one bit flag in the BitVector32. You can combine masks using the bitwise OR operation to create a mask that isolates multiple bit flags in the BitVector32.

Using a mask on a BitVector32 that is set up as sections might cause unexpected results.

This method is an O(1) operation.

The following code example shows how to create and use masks.

using System;
using System.Collections.Specialized;

public class SamplesBitVector32  {

   public static void Main()  {

      // Creates and initializes a BitVector32 with all bit flags set to FALSE.
      BitVector32 myBV = new BitVector32( 0 );

      // Creates masks to isolate each of the first five bit flags. 
      int myBit1 = BitVector32.CreateMask();
      int myBit2 = BitVector32.CreateMask( myBit1 );
      int myBit3 = BitVector32.CreateMask( myBit2 );
      int myBit4 = BitVector32.CreateMask( myBit3 );
      int myBit5 = BitVector32.CreateMask( myBit4 );
      Console.WriteLine( "Initial:               \t{0}", myBV.ToString() );

      // Sets the third bit to TRUE.
      myBV[myBit3] = true;
      Console.WriteLine( "myBit3 = TRUE          \t{0}", myBV.ToString() );

      // Combines two masks to access multiple bits at a time.
      myBV[myBit4 + myBit5] = true;
      Console.WriteLine( "myBit4 + myBit5 = TRUE \t{0}", myBV.ToString() );
      myBV[myBit1 | myBit2] = true;
      Console.WriteLine( "myBit1 | myBit2 = TRUE \t{0}", myBV.ToString() );



This code produces the following output.

Initial:                BitVector32{00000000000000000000000000000000}
myBit3 = TRUE           BitVector32{00000000000000000000000000000100}
myBit4 + myBit5 = TRUE  BitVector32{00000000000000000000000000011100}
myBit1 | myBit2 = TRUE  BitVector32{00000000000000000000000000011111}


Windows 7, Windows Vista, Windows XP SP2, Windows XP Media Center Edition, Windows XP Professional x64 Edition, Windows XP Starter Edition, Windows Server 2008 R2, Windows Server 2008, Windows Server 2003, Windows Server 2000 SP4, Windows Millennium Edition, Windows 98, Windows CE, Windows Mobile for Smartphone, Windows Mobile for Pocket PC, Xbox 360, Zune

The .NET Framework and .NET Compact Framework do not support all versions of every platform. For a list of the supported versions, see .NET Framework System Requirements.

.NET Framework

Supported in: 3.5, 3.0, 2.0, 1.1, 1.0

.NET Compact Framework

Supported in: 3.5, 2.0, 1.0

XNA Framework

Supported in: 3.0, 2.0, 1.0

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