An expression using the -= assignment operator, such as
x -= y
is equivalent to
x = x - y
except that x
is only evaluated once. The meaning of the - operator is dependent on the types of x
and y
(subtraction for numeric operands, delegate removal for delegate operands, and so forth).
The -= operator cannot be overloaded directly, but user-defined types can overload the - operator (see operator).
using System; class Test { public static void Main() { int a = 5; a -= 6; Console.WriteLine(a); } }
-1
C# Operators | CLR 7.13 Assignment operators