顾名思义，C# 使用 struct 关键字来定义值类型，而 Class 使用 class 关键字来定义引用类型。在C#中，结构体中定义的变量存储在堆栈中或以给定的变量类型存储，其实例称为结构体变量。然而，对于“类”，实例被称为对象并存储在堆结构内存单元中。就构造函数和析构函数而言，C# struct 不能有析构函数，但 Class 可以有析构函数。 Class 中允许进行成员分类，例如抽象类型、虚拟类型和受保护类型。
以下是 C# 结构体与类之间的 14 个最大差异。
C# 结构体和类之间的一些主要区别如下：
代码：
using System;
namespace structAndClass
{
//creating structure
public struct Demo
{
public int x, y;
//parameterized constructor
public Demo(int x, int y)
{
this.x = x;
this.y = y;
}
}
public class StructDemo
{
public static void Main(string[] args)
{
Demo a = new Demo(50, 50);
Demo b = a;
a.x = 100;
Console.WriteLine("Value of a.x = "+a.x);
Console.WriteLine("Value of b.x = "+b.x);
}
}
}输出：
代码：
using System;
namespace structAndClass
{
public class Demo
{
public int x, y;
public Demo(int x, int y)
{
this.x = x;
this.y = y;
}
}
public class StructDemo
{
public static void Main(string[] args)
{
Demo a = new Demo(50, 50);
Demo b = a;
a.x = 100;
Console.WriteLine("Value of a.x = "+a.x);
Console.WriteLine("Value of b.x = "+b.x);
}
}
}输出：
让我们通过一个比较表来看看 C# Struct 与 Class 之间的更多区别，以便清楚地理解：
| Parameter | C# Struct | Class |
| Data type | The structure is a value type of data type. | Class is a reference type data type. |
| Keyword | The structure can be defined using the ‘struct’ keyword. | The class can be defined using the ‘class’ keyword. |
| Storage area | The structure variable is stored either in stack or inline in containing type. | The object of the class is stored in heap. |
| Instance creation | The instance of a struct can be created with or without a ‘new’ keyword. | The instance of the class is created using a ‘new’ keyword. |
| Assignment | If we make an assignment to a variable of struct type then it creates a copy of the value being assigned. Thus, each variable instructs has its copy of data. | If we make an assignment to a variable of class type then it copies the reference. Thus, two or more variables in class can refer to the same object. |
| Constructor | The structure does not contain a parameterless instance constructor. | The class contains a parameterless instance constructor, if not defined explicitly by the user. |
| Destructor | It cannot have a destructor. | It can have a destructor. |
| Inheritance | The structure cannot inherit from another class or structure.
The structure cannot be used as a base for another structure or class. |
The class can inherit from another class. The class can be a base class for another class. |
| Data members | Members of a struct cannot be abstract, virtual or protected. | Members of a class can be abstract, virtual or protected. |
| Instance | The instance of the structure is called the structure variable. | The instance of the class is called an object. |
| Default access specifier | Members of the structure are public by default. | Members of the class are private by default. |
| Usage | The structure can be used for small data structures. | Class is used for the complex data structure. |
| Garbage collection | The instance of a struct cannot be garbage collected. | The instance of the class can be garbage collected. |
| Variable initializing | Including variable initializer is not allowed while making instance field declarations instruct. | Including variable initializer is allowed while making instance field declarations in a class. |
类和结构体都用来保存相关的数据项。对于大量数据我们可以使用类，对于小数据我们可以使用结构。类是引用类型，存储在堆中，而结构是值类型，存储在堆栈中。
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