In-depth C #

Value type: Duplicates the real value (stack) on the stack, mainly including data types (int,float,double and enumerations, etc.)

Value types originate from: System.ValueType

References to all types of reference types exist in the stack.

Reference type: The Real object property (heap) of real objects stored on the heap, mainly including (classes, interfaces, arrays)

Value types originate from: System.Object

Methods and Features:

public void Say () {

}

(1) Return value

(2) Access modifiers

(3) Method name

(4) Method body

(5) Parameters of the method

Definition of structure:

Access modifier struct struct name {

Structural body

}

You can have fields in the structure, or you can have methods

When defined, a field in a struct cannot be assigned a value

Packing and unpacking

The process of converting a value type to a reference type is called boxing, which is called unpacking

Unnecessary packing and unpacking should be minimized and the performance loss is greater.

Value parameter passing:

Reference parameter passing:

(Basic data types, such as, shape, float, character, bool, and struct are value types; arrays, interfaces and classes are reference types)

When a value type parameter is passed using a value method (without a ref decoration), the modification of the parameter in the method does not persist

When a reference type parameter is passed using a value method (without a ref decoration), the modification of the parameter in the method is preserved

When you pass a value type or reference type parameter by using a reference method (with ref decoration), the modification of the parameter in the method is preserved

In-depth C #