struct
suggest changeA struct
type is a value type that is typically used to encapsulate small groups of related variables, such as the coordinates of a rectangle or the characteristics of an item in an inventory.
Classes are reference types, structs are value types.
using static System.Console;
namespace ConsoleApplication1
{
struct Point
{
public int X;
public int Y;
public override string ToString()
{
return $"X = {X}, Y = {Y}";
}
public void Display(string name)
{
WriteLine(name + ": " + ToString());
}
}
class Program
{
static void Main()
{
var point1 = new Point {X = 10, Y = 20};
// it's not a reference but value type
var point2 = point1;
point2.X = 777;
point2.Y = 888;
point1.Display(nameof(point1)); // point1: X = 10, Y = 20
point2.Display(nameof(point2)); // point2: X = 777, Y = 888
ReadKey();
}
}
}
Structs can also contain constructors, constants, fields, methods, properties, indexers, operators, events, and nested types, although if several such members are required, you should consider making your type a class instead.
Some suggestions from MS on when to use struct and when to use class:
CONSIDER
defining a struct instead of a class if instances of the type are small and commonly short-lived or are commonly embedded in other objects.
AVOID
defining a struct unless the type has all of the following characteristics:
- It logically represents a single value, similar to primitive types (int, double, etc.)
- It has an instance size under 16 bytes.
- It is immutable.
- It will not have to be boxed frequently.
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