C # practice supermarket cash register system,

C # practice supermarket cash register system,
Class Design

Category 1: product class. The parent class is an abstract class;
Type 2: discount class. The parent class is also an abstract class.
The class diagram is as follows;

Use skill source code

Warehouse

Using System; using System. collections. generic; using System. linq; using System. text; using System. threading. tasks; // advantages of this program. When adding a cargo type, you do not need to modify the local code. You only need to call AddShelf to add a shelf. When adding a cargo, add an object based on the cargo name; the reflection mechanism is used when goods are added; namespace _ 33 _ supermarket cash register system {class Cangku {// goods are stored in the warehouse, which must meet the requirements of classification and sorting, therefore, shelves are required; public Dictionary <string, List <ProductFather> list = new Dictionary <string, List <ProductFather> (); // objects that can be operated on shelves, goods, operation Method: add or delete; // <summary> /// Add a shelf for the warehouse; /// </summary> /// <param name = "name"> name of the shelf to be added </param> /// <returns> If the shelf already exists, an error is returned., otherwise, the shelf is successfully added </returns> public bool AddShelf (string name) {if (list. containsKey (name) return false; list [name] = new List <ProductFather> (); return true ;}/// <summary> /// delete a shelf; /// </summary> /// <param name = "name"> name of the shelf to be deleted </param> /// <param name = "reason"> the value is successfully deleted, failure is the cause of failure returned, including the failure of the shelf and the failure of the goods that do not exist </para M> // <returns> indicates whether the deletion is successful </returns> public bool DelShelf (string name, out string reason) {if (list. containsKey (name) {if (list [name]. count = 0) {list. remove (name); reason = "deleted"; return true;} else {reason = "goods available on shelves"; return false ;}} else {reason = "this shelf does not exist"; return false ;}/// <summary> // Add count items of the proType to the shelf; /// </summary> /// <param name = "proType"> goods type. The constructor of the object is found through reflection of this string to implement the factory model. Formula </param> /// <param name = "count"> quantity of goods to be added </param> /// <param name = "price"> price of goods </param> // <returns> </returns> public bool AddProducts (string proType, int count, double price) {if (! List. containsKey (proType) {return false;} string str = "_ 33 _ supermarket cash register system. "+ proType; for (int I = 0; I <count; I ++) {// reflection mechanism is used here; list [proType]. add (ProductFather) Activator. createInstance (System. type. getType (str), price, proType, Guid. newGuid (). toString ();} return true;} // <summary> /// retrieve some items from the warehouse; /// </summary> /// <param name = "proType"> type of the product to be retrieved </param> /// <param name = "reqCount"> required amount removed </par Am> /// <param name = "getCount"> actual amount removed </param> /// <returns> returns the removed product array </returns> public ProductFather [] delProducts (string proType, int reqCount, out int getCount) {ProductFather [] pros = new ProductFather [reqCount]; // an array of determined sizes during runtime; if (! List. containsKey (proType) // There is no shelf for this cargo; {getCount = 0; return null;} for (int I = 0; I <reqCount; I ++) {if (list [proType]. count = 0) // If the goods have been obtained; {getCount = I; return pros;} pros [I] = list [proType] [0]; list [proType]. removeAt (0);} getCount = reqCount; return pros ;} /// <summary> /// obtain the product information in the warehouse /// </summary> /// <returns> returns a formatted string array with one product and one string, you can use the same protocol to parse public string [] GetInfo () {// store shelf information using formatted strings; string [] info = new string [list. count]; int I = 0; foreach (var item in list. keys) {info [I] = item. toString (); info [I] + = "|" + list [item]. count; info [I] + = "|" + list [item] [0]. price;} return info ;}}}

Commodities

Using System; using System. collections. generic; using System. linq; using System. text; using System. threading. tasks; namespace _ 33 _ supermarket cash register system {class ProductFather {public double Price {get; set;} public string Name {get; set;} public string ID {get; set ;} public ProductFather (double price, string name, string id) {this. price = price; this. name = name; this. ID = id ;}}}