NGWS SDK Documentation  

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-= 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 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).

Example

using System;
class Test {
   public static void Main() {
      int a = 5;
      a -= 6;
      Console.WriteLine(a);
   }
}

Output

-1

See Also

C# Operators | CLR 7.13 Assignment operators