Building e-Commerce Sites with the .NET Framework

Structs

Structs are similar to classes, except that classes are reference types and structs are value types. In other words, if an instance of a struct is passed to a method, a copy is made and passed. If an instance of a class is passed to a method, a reference to that object is passed. So, structs are useful for creating user-defined types that behave like built-in types. Listing A.5 shows a simple struct example.

Listing A.5. A Simple Point Struct Declaration

1: using System; 2: 3: struct Point{ 4: public double X; 5: public double Y; 6: 7: public void print(){ 8: Console.WriteLine("(" + X + ", " + Y + ")" ); 9: } 10: 11: } // End of Point struct 12: 13: public class PointStructTester{ 14: public static void Main(){ 15: Point p; 16: p.X = ...