Log4net

Reference address:

“C# log4net configuration”

“C# use log4net to record logs”

Project reference nuget package log4net

Add a reference to the App.config file

Add the fo

C # generics

Generic allows you to delay writing the specification of the data type of the programming element in the class or method until it is actually used in the program. In other words, generics allow you

C # data type (2)

String char a collection of string name = “John Doe”; Double quotes, char is a single quote
string is immutable, once it is initialized, it cannot be changed. Every time you use the existing string