Structure and class

In C + +, structs and classes are similar, and the members of structs default to public types, and the members of the classes default to private types. In C #, they are completely different types:

1: Type:

Structs are value types, and addresses are allocated on the stack, so assignments between structs can create new structures, while classes are reference types, and addresses are assigned on the heap, so assignments between classes are just replication references. The execution efficiency of the stack is more efficient than that of the heap, but the stack has limited resources and is not suitable for dealing with large logically complex objects, so the struct handles the small object treated as the base type, while the class handles a business logic.

2: Inheritance:

Structs cannot be inherited except that they are derived from System.ValueType. But structs can inherit interfaces, and methods and classes inherit interfaces. A class can be derived from a base class and can derive any number of interfaces.

3. Internal structure:

Structure:

Provides a parameterless default constructor and does not allow substitution, but you can add a parameter constructor.

No destructor

No virtual, abstract, and sealed (because it cannot be inherited)

Cannot have protected modifiers

Initializing an instance field in a struct is an error

Class:

There is a default constructor

There is a destructor

You can use virtural, abstract, and sealed

There are protected modifiers

Instance fields can be initialized

4: Structure can specify how fields are laid out in memory