Reference type Object

1. Modify the properties of an object within a method, and you can modify the object directly

usingSystem;usingSystem.Collections.Generic;usingSystem.Linq;usingSystem.Data;usingSystem.Text;usingSystem.Threading.Tasks;namespacetest{classProgram {Static voidMain (string[] args) {Attendance a=NewAttendance ("AAA");            AA (a);            Console.WriteLine (A.name);        Console.ReadLine (); }         Public Static  voidAA (attendance a) {//A = new attendance ("dddd");A.name ="Eee"; }    }     Public classAttendance { PublicAttendance (stringName) {             This. Name =Name; }         Public stringName {Get;Set; }  PublicDateTime Attendancedate {Get;Set; } }}

The result is the Eee

2. Assigning a similar instance to the object directly within the method will find that the object has not changed

  classProgram {Static voidMain (string[] args) {Attendance a=NewAttendance ("AAA");            AA (a);            Console.WriteLine (A.name);        Console.ReadLine (); }         Public Static  voidAA (attendance a) {a=NewAttendance ("dddd"); //a.name = "eee";        }    }

And the result is AAA.

 classProgram {Static voidMain (string[] args) {Attendance a=NewAttendance ("AAA");            AA (a);            Console.WriteLine (A.name);        Console.ReadLine (); }         Public Static  voidAA (attendance a) {a=NewAttendance ("dddd"); A.name="Eee"; }    }

or AAA?

 classProgram {Static voidMain (string[] args) {Attendance a=NewAttendance ("AAA");            AA (a);            Console.WriteLine (A.name);        Console.ReadLine (); }         Public Static  voidAA (attendance a) {A.name="Eee"; A=NewAttendance ("dddd"); }    }

The result is the Eee

3. To reassign an object within a method, you can use ref so that the object will be modified

 classProgram {Static voidMain (string[] args) {Attendance a=NewAttendance ("AAA"); AA (refa);            Console.WriteLine (A.name);        Console.ReadLine (); }         Public Static  voidAA (refattendance a) {A.name="Eee"; A=NewAttendance ("dddd"); }    }

The result is dddd.

Reference type Object