Declaring a struct C# with Example

public struct Vector 
{ 
public int X; 
public int Y; 
public int Z; 
} 
public struct Point 
{ 
public decimal x, y; 
public Point(decimal pointX, decimal pointY) 
{ 
x = pointX; 
y = pointY; 
} 
} 
struct instance fields can be set via a parametrized constructor or individually after struct construction. 
Private members can only be initialized by the constructor. 
struct defines a sealed type that implicitly inherits from System.ValueType. 
Structs cannot inherit from any other type, but they can implement interfaces. 
Structs are copied on assignment, meaning all data is copied to the new instance and changes to one of them 
are not reflected by the other. 
A struct cannot be null, although it can used as a nullable type: 
Vector v1 = null; //illegal 
Vector? v2 = null; //OK 
Nullable v3 = null // OK 
Structs can be instantiated with or without using the new operator. 
//Both of these are acceptable 
Vector v1 = new Vector(); 
v1.X = 1; 
v1.Y = 2; 
v1.Z = 3; 
Vector v2; 
v2.X = 1; 
v2.Y = 2; 
v2.Z = 3; 
However, the new operator must be used in order to use an initializer: 
Vector v1 = new MyStruct { X=1, Y=2, Z=3 }; // OK 
Vector v2 { X=1, Y=2, Z=3 }; // illegal 
 

A struct can declare everything a class can declare, with a few exceptions: 
A struct cannot declare a parameterless constructor. struct instance fields can be set via a parameterized 
constructor or individually after struct construction. Private members can only be initialized by the 
constructor. 
A struct cannot declare members as protected, since it is implicitly sealed. 
Struct fields can only be initialized if they are const or static.