Depth. NET and C # small car rental system framework

Preface: Before writing this small system, we should guess what knowledge points we may need to use.

So for this small system: the main use of the following knowledge:

Encapsulation, Collections (ArrayList and Hashtable) and generics and non-generic collections (generics:list<> and non-generic:dictioanry<>),

Constructors, method overloads, polymorphism (inheritance, Abstraction: Abstract classes and abstract methods)

：

The first step.

Create several classes

Vehicle: Tool class ( parent class, superclass, base class ), this class is abstract class

There are method overloads, constructors

This class is primarily responsible for providing the properties of the car class

Property:

   Public stringColor {Get;Set; }  Public Doubledailyrent {Get;Set; }  Public stringLicenseno {Get;Set; }  Public stringName {Get;Set; }  Public intrentdate {Get;Set; }  Public stringRentuser {Get;Set; }  Public intYearsofservice {Get;Set; }

02: Create a Car Class (car) (subclass)

Constructor, method overload.

03: Create a Truck Class (Truck) (subclass)

constructors, method overloads

Property:

public int Load

{

get {return load;}

set {load = value;}

}

04: Create a tool (Factory) class (Vehicleutil)

The second step.

Code implementation Ideas:

Vehicle: Tool, Parent class (*):

The code is as follows:

  PublicVehicle () {} PublicVehicle (stringColorDoubleDailyrent,stringLicenseno,stringNameintYearsofservice) {Color=color; Dailyrent=dailyrent; Licenseno=Licenseno; Name=name; Yearsofservice=Yearsofservice; }         Public Abstract DoubleCalcPrice ();

02: Automobile (CAR)

The code is as follows:

 PublicCar () {} PublicCar (stringLicenseno,stringNamestringColorintYearsofservice,Doubledailyrent) {Color=color; Dailyrent=dailyrent; Licenseno=Licenseno; Name=name; Yearsofservice=Yearsofservice; }         Public Override DoubleCalcPrice () {DoubleTotalprice =0; Totalprice= Rentdate *dailyrent; returnTotalprice; }

03: Truck Class (Truck)

The code is as follows:

   PublicTruck (stringLicenseno,stringNamestringColorintYearsofservice,DoubleDailyrent,intload) {Color=color; Dailyrent=dailyrent; Licenseno=Licenseno; Name=name; Yearsofservice=Yearsofservice; Load=load; }         Public Override DoubleCalcPrice () {DoubleTotalprice =0; Totalprice= Rentdate *dailyrent; returnTotalprice;}

04: Tool (Factory) class (Vehicleutil

The code is as follows:

  Public StaticVehicle Createvehicle (stringLicenseno,stringNamestringColorintYearsofservice,DoubleDailyrent,intLoadstringtype) {Vehicle Vehicle=NULL; Switch(type) { Case "Car": Vehicle=NewCar (Licenseno, name, color, Yearsofservice, dailyrent);  Break;  Case "Truck": Vehicle=NewTruck (Licenseno, name, color, Yearsofservice, dailyrent, load);  Break; default:                     Break; }            returnvehicle; }

The third step.

Rental Event: (Btnrent_click (object sender, EventArgs e))

The key code is as follows:

 if(Lvlist. Selecteditems.count = =0) {MessageBox.Show ("Please selectOne line"); return; }            if(Txtuser.text = ="") {MessageBox.Show ("Please enter the customer name! "); return; }            stringKey = Lvlist. selecteditems[0].            Text; Vehicle Vehicle=Vehicles[key]; Vehicles.            Remove (key); Rentvehicles.            ADD (key, vehicle);            Printvehicles (vehicles, lvlist); MessageBox.Show ("Rental Success!! ");//printvehicles bind data to the ListView         Public voidPrintvehicles (dictionary<string, vehicle>listprirnt, ListView lvinfo) {ListViewItem LV=NULL; Lvinfo.            Items.clear (); foreach(Vehicle Iteminchlistprirnt. Values) {if(item isCar) {LV=NewListViewItem (item.                    Licenseno); Lv. SubItems.Add (item.                    Name); Lv. SubItems.Add (item.                    Color.tostring ()); Lv. SubItems.Add (item.                    Yearsofservice.tostring ()); Lv. SubItems.Add (item.                    Dailyrent.tostring ()); Lvinfo.                Items.Add (LV); }               Else if(item isTruck) {LV=NewListViewItem (item.                    Licenseno); Lv. SubItems.Add (item.                    Name); Lv. SubItems.Add (item.                    Color.tostring ()); Lv. SubItems.Add (item.                    Yearsofservice.tostring ()); Lv. SubItems.Add (item.                    Dailyrent.tostring ()); Lv. SubItems.Add ((Truck) item).                    Load.tostring ()); Lvinfo.                Items.Add (LV); }

Fourth Step

and the car. Written in the Btngivemoney_click event

  if(Txtdaynum.text = =string. Empty) {MessageBox.Show ("Please enter the number of days! "); return; }            stringAddnum = lvlistgive.selecteditems[0].            Text; Vehicle vechile=Rentvehicles[addnum]; Rentvehicles.            Remove (Addnum); Vechile. Rentdate=Convert.ToInt32 (Txtdaynum.text); DoubleMoney =0; //call the Calculate price method Money=vechile.            CalcPrice (); MessageBox.Show ("you're going to be blessed ."+Money ); Vehicles.             ADD (Addnum, vechile); //Refreshprintvehicles (Rentvehicles, lvlistgive); MessageBox.Show ("Success!! ");

Fifth step.

Add a vehicle to write in the Btnincar_click event

if(Txtweight.text = =""|| Txtusetime.text = =""|| Txttype.text = =""|| Txtid.text = =""|| Txtdayrentmoney.text = =""|| Cbocolor.text = ="") {MessageBox.Show ("please fill in the complete! "); }            Else            {                stringLicon =Txtid.text; stringcolor =Cbocolor.text; DoubleMon =convert.todouble (Txtdayrentmoney.text); intTine =Convert.ToInt32 (Txtusetime.text); stringTy =Txttype.text; if(radjiaocar.checked) {Car CA=NewCar (licon, Ty, color, tine, mon); Vehicles.                ADD (Licon, CA); }               if(radkacar.checked) {intLoad =Convert.ToInt32 (Txtweight.text); Truck TR=NewTruck (licon, Ty, color, tine, Mon, load); Vehicles.                ADD (Licon, TR); } MessageBox.Show ("Add success! "); }

Note: This article has no code comment, because you want to look at the code under any circumstances,

can also read the meaning of the code.

Depth. NET and C # small car rental system framework