& Operator (C# Reference)
The & operator can function as either a unary or a binary operator.
Remarks
The unary & operator returns the address of its operand (requires unsafe context).
Binary & operators are predefined for the integral types and bool. For integral types, & computes the logical bitwise AND of its operands. For bool operands, & computes the logical AND of its operands; that is, the result is true if and only if both its operands are true.
The & operator evaluates both operators regardless of the first one's value. For example:
int i = 0;
if (false & ++i == 1)
{
// i is incremented, but the conditional
// expression evaluates to false, so
// this block does not execute.
}
User-defined types can overload the binary & operator (see operator). Operations on integral types are generally allowed on enumeration. When a binary operator is overloaded, the corresponding assignment operator, if any, is also implicitly overloaded.
Example
// cs_operator_ampersand.cs
using System;
class MainClass
{
static void Main()
{
Console.WriteLine(true & false); // logical and
Console.WriteLine(true & true); // logical and
Console.WriteLine("0x{0:x}", 0xf8 & 0x3f); // bitwise and
}
}
Output
False True 0x38