|= Operator (C# Reference)


Updated: July 20, 2015

For the latest documentation on Visual Studio 2017 RC, see Visual Studio 2017 RC Documentation.

The OR assignment operator.

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 logical OR operation on integral operands and logical OR on bool operands.

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

    class MainClass7
        static void Main()
            int a = 0x0c;
            a |= 0x06;
            Console.WriteLine("0x{0:x8}", a);
            bool b = true;
            b |= false;

C# Reference
C# Programming Guide
C# Operators