Exemplo n.º 1
0
        static void Main(string[] args)
        {
            Customer customer1 = new Customer()
            {
                ID     = 101,
                Name   = "Mark",
                Salary = 5000,
            };

            Customer customer2 = new Customer()
            {
                ID     = 110,
                Name   = "Pam",
                Salary = 6500,
            };

            Customer customer3 = new Customer()
            {
                ID     = 119,
                Name   = "John",
                Salary = 3500,
            };

            List <Customer> customers = new List <Customer>(2);

            customers.Add(customer1);
            customers.Add(customer2);
            customers.Add(customer3);



            Dictionary <int, Customer> dictionaryCustomer = new Dictionary <int, Customer>();

            dictionaryCustomer.Add(customer1.ID, customer1);
            dictionaryCustomer.Add(customer2.ID, customer2);
            dictionaryCustomer.Add(customer3.ID, customer3);

            // Vedio 73
            // TryGetValue() method
            // the return type is boolean
            Customer cust2;

            if (!dictionaryCustomer.TryGetValue(101, out cust2)) // out put value to cust
            {
                Console.WriteLine("ID = {0},Name = {1},Salary = {2},", cust2.ID, cust2.Name, cust2.Salary);
            }
            else
            {
                Console.WriteLine("Key is not available");
            }

            //Count() method
            Console.WriteLine("The total count of the dictionary is{0}", dictionaryCustomer.Count());
            // There are 2 overloaded version of this Count() method
            Console.WriteLine("The total count of the dictionary is{0}", dictionaryCustomer.Count(kvp => kvp.Value.Salary > 400));
            //

            // remove an item from dictionary
            dictionaryCustomer.Remove(109); // if the key does not exit, you would not get an exception.
                                            // remove all the items from the dictionary, you can use clear
                                            //dictionaryCustomer.Clear();

            // use linq expression
            Customer[] customer = new Customer[3];
            customer[0] = customer1;
            customer[1] = customer2;
            customer[2] = customer3;
            // key is the customer id, the value is the customer itself
            Dictionary <int, Customer> dic = customer.ToDictionary(cust => cust.ID, cust => cust);

            foreach (KeyValuePair <int, Customer> kvp in dic)
            {
                Console.WriteLine("key = {0},", kvp.Key);
                Customer cust = kvp.Value;
                Console.WriteLine("ID = {0}, Name = {1}, Salary = {2}", cust.ID, cust.Name, cust.Salary);
            }


            Customer customer119 = dictionaryCustomer[119];

            Console.WriteLine("ID = {0}, Name = {1}, Salary = {2}", customer119.ID, customer119.Name, customer119.Salary);

            // you can use var instead of KeyValuePair<>, but this is more clear
            foreach (KeyValuePair <int, Customer> customerKeyValuePair in dictionaryCustomer)
            {
                Console.WriteLine("ID = {0}", customerKeyValuePair.Key);
                Customer cust = customerKeyValuePair.Value;
                Console.WriteLine("ID = {0}, Name = {1}, Salary = {2}", cust.ID, cust.Name, cust.Salary);
                Console.WriteLine("--------------------------");
            }

            // the keys in the dictionary must be unique
            foreach (int key in dictionaryCustomer.Keys)
            {
                Console.WriteLine("The key in the dictionary is {0}", key);
                Console.WriteLine("**********");
            }

            if (!dictionaryCustomer.ContainsKey(customer1.ID))
            {
                dictionaryCustomer.Add(customer1.ID, customer1);
            }

            Console.ReadLine();
        }
Exemplo n.º 2
0
        static void Main(string[] args)
        {
            Customer c1 = new Customer
            {
                ID     = 101,
                Name   = "Mark",
                Salary = 500
            };
            Customer c2 = new Customer
            {
                ID     = 110,
                Name   = "Richard",
                Salary = 5000
            };

            Customer c3 = new Customer
            {
                ID     = 125,
                Name   = "Max",
                Salary = 500
            };

            Customer[] customers = new Customer[3];
            customers[0] = c1;
            customers[1] = c2;
            customers[2] = c3;
            Dictionary <int, Customer> dict = customers.ToDictionary(cust => cust.ID, cust => cust);

            foreach (KeyValuePair <int, Customer> kvp in dict)
            {
                Console.WriteLine("Key= {0}", kvp.Key);
                Customer cust = kvp.Value;
                Console.WriteLine("ID = {0} ,Name = {1} ,Salary = {2}", cust.ID, cust.Name, cust.Salary);
            }


            ////Creating the dictionary
            //Dictionary<int,Customer> dictionartCustomers = new Dictionary<int, Customer>();
            ////Adding data to dictionary
            //dictionartCustomers.Add(c1.ID,c1);
            //dictionartCustomers.Add(c2.ID, c2);
            //dictionartCustomers.Add(c3.ID, c3);

            ////TryGetValue added

            //Customer cust;
            //if (dictionartCustomers.TryGetValue(101, out cust))
            //{
            //    Console.WriteLine("ID= {0}, Name= {1} , Salary= {2}", cust.ID, cust.Name, cust.Salary);
            //}
            //else
            //{
            //    Console.WriteLine("The Key is not found");
            //}

            ////Count added
            //Console.WriteLine("Total Items = {0}",dictionartCustomers.Count(kvp =>kvp.Value.Salary>4000));

            ////Remove added
            //dictionartCustomers.Remove(110);

            ////Clear added
            //dictionartCustomers.Clear();

            //Customer customer101 = dictionartCustomers[101];

            //Console.WriteLine("Id = {0} , Name = {1} , salary = {2}",customer101.ID,customer101.Name,customer101.Salary);

            //foreach (KeyValuePair<int, Customer> customerKeyValuePair in dictionartCustomers)
            //{
            //    //printing the values
            //   Console.WriteLine("ID ={0}", customerKeyValuePair);
            //   Customer cust = customerKeyValuePair.Value;
            //   Console.WriteLine("ID = {0},Name={1} and salary = {2}",cust.ID,cust.Name,cust.Salary);
            //   Console.WriteLine("--------------------------------------------");
            //}
        }