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public string Name { get; set; } public int Age { get; set; } public string City { get; set; } } class Listing 43 { static void Main(string[] args) { // create a new instance of Person and // provide values for the public properties Person person = new Person() { Name = "Adam Freeman", Age = 38, City = "London" }; // wait for input before exiting Console.WriteLine("Press enter to finish"); Console.ReadLine(); } } The Person class in Listing 9-43 uses the implicit default constructor feature, meaning that initial values for an instance of Person cannot be provided as constructor parameters. Instead, I have supplied the values for the public properties in a code block that follows the constructor. For each property, I made an assignment using the assignment operator (=), and each assignment is separated by a comma (,). In Listing 9-43, I have included the open and closed parentheses characters, but you can omit them if there are no constructor parameters, like this: Person person = new Person { Name = "Adam Freeman", Age = 38, City = "London" }; This is a nice feature, but it should be used with caution. In effect, you are relying on the person creating an instance of your class to ensure public fields are initialized with useful values. You should write your classes so that property setters check for valid values and your methods so that you check to ensure that values have been assigned. (You can use this feature with fields as well as properties, but it is generally better practice to use public properties to expose the value of your fields, as explained in 7.)

You can overload constructors just as you can regular methods. You can have as many constructors as you like in a class, as long as the sequence of parameters types is unique. Overloaded constructors are usually provided as a convenience to simplify creating new instances of a class. Listing 9-44 contains an example.

Direct mail Sent Cost for each Promotion cost Response rate Responses Pro t per response Pro ts Net pro ts Eight promotions per year Annual pro t per name 200,000 $0.50 $100,000 3.0% 6,000 $20.00 $120,000 $20,000 $160,000 $0.80 Email 200,000 $0.04 $8000 1.0% 2,000 $20.00 $40,000 $32,000 $256,000 $1.28

12 13 5 5 8 8 13 13 3 3 1

Listing 9-44. Overloading a Constructor class Person { public string Name { get; set; } public int Age { get; set; } public string City { get; set; } public Person(string name, int age, string city) { Name = name; Age = age; City = city; } public Person(string name, string age, string city) { Name = name; Age = int.Parse(age); City = city; } } The Person class in Listing 9-44 contains two constructors. The second constructor allows me to specify the age parameter as a string, rather than the int that is required by the first constructor. If the Person class is created at different places in a program, providing the second constructor means that I don t have to duplicate the code that parses the string to get an integer value, which is always a good thing, not least because I can change the way that the parsing is done in a single place.

In fact, the only difference between the two constructors in Listing 9-44 is the type of the age parameter. I can reduce the duplication in the Person class by having the second constructor make use of the first one. I do this with the this keyword. Listing 9-45 contains a demonstration. Listing 9-45. Calling One Constructor from Another class Person { public string Name { get; set; } public int Age { get; set; } public string City { get; set; } public Person(string name, int age, string city) { Name = name; Age = age; City = city; } public Person(string name, string age, string city) : this(name, int.Parse(age), city) { } }

static void printArrayContents(string[] arr) { for (int i = 0; i < arr.Length; i++) { Console.WriteLine("Array Item {0}: {1}", i, arr[i]); } } } The listing includes a printArrayContents method that uses the Length property in a for loop condition to enumerate the contents of arrays that are passed as method parameters. The Length property returns the capacity allocated to the array when it was defined, meaning that there may be default values for the array type in the array, including null for reference types.

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