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				|  |  | +// See CSHARP-README.txt for information and build instructions.
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				|  |  | +
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				|  |  | +using System;
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				|  |  | +using System.IO;
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				|  |  | +using Tutorial;
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				|  |  | +
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				|  |  | +class AddPerson {
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				|  |  | +    // This function fills in a Person message based on user input.
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				|  |  | +    static Person PromptForAddress(TextReader input, TextWriter output) {
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				|  |  | +        Person.Builder person = Person.CreateBuilder();
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				|  |  | +
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				|  |  | +        output.Write("Enter person ID: ");
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				|  |  | +        person.Id = int.Parse(input.ReadLine());
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				|  |  | +        
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				|  |  | +        output.Write("Enter name: ");
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				|  |  | +        person.Name = input.ReadLine();
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				|  |  | +        
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				|  |  | +        output.Write("Enter email address (blank for none): ");
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				|  |  | +        string email = input.ReadLine();
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				|  |  | +        if (email.Length > 0) {
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				|  |  | +            person.Email = email;
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				|  |  | +        }
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				|  |  | +
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				|  |  | +        while (true) {
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				|  |  | +            output.Write("Enter a phone number (or leave blank to finish): ");
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				|  |  | +            string number = input.ReadLine();
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				|  |  | +            if (number.Length == 0) {
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				|  |  | +                break;
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				|  |  | +            }
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				|  |  | +
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				|  |  | +            Person.Types.PhoneNumber.Builder phoneNumber = 
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				|  |  | +                Person.Types.PhoneNumber.CreateBuilder().SetNumber(number);
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				|  |  | +
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				|  |  | +            output.Write("Is this a mobile, home, or work phone? ");
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				|  |  | +            String type = input.ReadLine();
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				|  |  | +            switch (type) {
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				|  |  | +                case "mobile":
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				|  |  | +                    phoneNumber.Type = Person.Types.PhoneType.MOBILE;
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				|  |  | +                    break;
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				|  |  | +                case "home":
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				|  |  | +                    phoneNumber.Type = Person.Types.PhoneType.HOME;
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				|  |  | +                    break;
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				|  |  | +                case "work":
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				|  |  | +                    phoneNumber.Type = Person.Types.PhoneType.WORK;
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				|  |  | +                    break;
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				|  |  | +                default:
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				|  |  | +                    Console.WriteLine("Unknown phone type. Using default.");
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				|  |  | +                    break;
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				|  |  | +            }
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				|  |  | +            
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				|  |  | +            person.AddPhone(phoneNumber);
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				|  |  | +        }        
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				|  |  | +        return person.Build();
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				|  |  | +    }
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				|  |  | +    
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				|  |  | +    // Main function:  Reads the entire address book from a file,
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				|  |  | +    // adds one person based on user input, then writes it back out to the same
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				|  |  | +    // file.
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				|  |  | +    public static int Main(string[] args) {
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				|  |  | +        if (args.Length != 1) {
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				|  |  | +            Console.Error.WriteLine("Usage:  AddPerson ADDRESS_BOOK_FILE");
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				|  |  | +            return -1;
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				|  |  | +        }
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				|  |  | +        
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				|  |  | +        AddressBook.Builder addressBook = AddressBook.CreateBuilder();
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				|  |  | +        
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				|  |  | +        if (File.Exists(args[0])) {
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				|  |  | +            using (Stream file = File.OpenRead(args[0])) {
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				|  |  | +                addressBook.MergeFrom(file);
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				|  |  | +            }
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				|  |  | +        } else {
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				|  |  | +            Console.WriteLine("{0}: File not found. Creating a new file.", args[0]);
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				|  |  | +        }
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				|  |  | +                       
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				|  |  | +        // Add an address.
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				|  |  | +        addressBook.AddPerson(PromptForAddress(Console.In, Console.Out));
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				|  |  | +
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				|  |  | +        // Write the new address book back to disk.
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				|  |  | +        using (Stream output = File.OpenWrite(args[0])) {
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				|  |  | +            addressBook.Build().WriteTo(output);
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				|  |  | +        }
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				|  |  | +        return 0;
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				|  |  | +    }
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				|  |  | +}
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