Class Library Delegate

1. C # source code files, including in their own projects

2, class library, suffix name is. dll

Advantages: You write a method that others do not see the implementation process, strong confidentiality

Cons: If you write a method with errors, others cannot change

Commissioned:
Pointers that can be understood as functions

Delegate-Defining keywords

declaring delegate types
public delegate int Firstdel (int aaa, int bbb);

Create delegate variable, assign value, function point to
Firstdel f1 = new Jiajian (). Jia;

int c = F1 (10, 20);

var: universal type

Object: base class for all types

As: type conversion, if the conversion is unsuccessful, does not error, but returns a null

is: Determines whether a variable/object is a certain type, returns a bool value

Generic collection: List<t>

A set of fixed-length, invariant types

List<jiajian>list=new list<jiajian> ();

Class Library Delegate