The AND assignment operator.

lhs &= expr

Where:

lhs

A storage location, property, or indexer.

expr

An expression.

Remarks

An expression using the &= assignment operator, such as

x &= y

is equivalent to

x = x & y

except that x is only evaluated once. The & operator performs a bitwise AND operation on integral operands and logical AND on bool operands.

The &= operator cannot be overloaded directly, but user-defined types can overload the & operator (see operator).

Example

// cs_operator_and_assignment.cs
using System;
class Test 
{
   public static void Main() 
   {
      int a = 0x0c;
      a &= 0x06;
      Console.WriteLine("0x{0:x8}", a);
      bool b = true;
      b &= false;
      Console.WriteLine(b);
   }
}

Output

0x00000004
False

See Also

C# Operators | 7.13 Assignment operators