static void Main(string[] args)
{
// Create Contacts for address book
Contact Abbey = new Contact()
{
FirstName = "Abbey", LastName = "Brown",
Email = "*****@*****.**",
Address = "1900 Lowlands, Nashville, TN 37216"
};
Contact Rupert = new Contact()
{
FirstName = "Rupert", LastName = "Jones",
Email = "*****@*****.**",
Address = "9832 Harding Place, Nashville, TN 37207"
};
Contact Katerina = new Contact()
{
FirstName = "Katerina", LastName = "Freeman",
Email = "*****@*****.**",
Address = "000 Who Knows, WhiteHouse, TN 37072"
};
// Create an AddressBook and add Contacts to it
AddressBook tacoAddressBook = new AddressBook();
tacoAddressBook.AddContact(Abbey);
tacoAddressBook.AddContact(Rupert);
tacoAddressBook.AddContact(Katerina);
// Try to add a contact a second time
tacoAddressBook.AddContact(Abbey);
// Create a list of emails that match our Contacts
List <string> emails = new List <string>()
{
"*****@*****.**",
"*****@*****.**",
"*****@*****.**",
};
// Insert an email that does NOT match a Contact (insert method)
//Takes the argument of index you want to insert and the list item value
emails.Insert(3, "*****@*****.**");
// Search AddressBook by email and print the information about each Contact
foreach (string email in emails)
{
try
{
Contact contact = tacoAddressBook.GetByEmail(email);
Console.WriteLine("----------------------------");
Console.WriteLine($"Name: {contact.FullName}");
Console.WriteLine($"Email: {contact.Email}");
Console.WriteLine($"Address: {contact.Address}");
}
catch (KeyNotFoundException ex)
{
Console.WriteLine($@"
----------------------------
Unable to find {email} in Address Book.
----------------------------
Developer ERROR Message: {ex.Message}
"
);
}
}
}
/*
* 1. Add the required classes to make the following code compile.
* HINT: Use a Dictionary in the AddressBook class to store Contacts. The key should be the contact's email address.
*
* 2. Run the program and observe the exception.
*
* 3. Add try/catch blocks in the appropriate locations to prevent the program from crashing
* Print meaningful error messages in the catch blocks.
*/
static void Main(string[] args)
{
// Create a few contacts
Contact bob = new Contact()
{
FirstName = "Bob",
LastName = "Smith",
Email = "*****@*****.**",
Address = "100 Some Ln, Testville, TN 11111"
};
Contact sue = new Contact()
{
FirstName = "Sue",
LastName = "Jones",
Email = "*****@*****.**",
Address = "322 Hard Way, Testville, TN 11111"
};
Contact juan = new Contact()
{
FirstName = "Juan",
LastName = "Lopez",
Email = "*****@*****.**",
Address = "888 Easy St, Testville, TN 11111"
};
// Create an AddressBook and add some contacts to it
AddressBook addressBook = new AddressBook();
try
{
addressBook.AddContact(bob);
addressBook.AddContact(sue);
addressBook.AddContact(juan);
addressBook.AddContact(sue);
}
catch
{
Console.WriteLine("You've already added this contact");
}
// Try to addd a contact a second time
// Create a list of emails that match our Contacts
List <string> emails = new List <string>()
{
"*****@*****.**",
"*****@*****.**",
"*****@*****.**",
};
// Insert an email that does NOT match a Contact
emails.Insert(1, "*****@*****.**");
// Search the AddressBook by email and print the information about each Contact
foreach (string email in emails)
{
try
{
Contact contact = addressBook.GetByEmail(email);
Console.WriteLine("----------------------------");
Console.WriteLine($"Name: {contact.FullName}");
Console.WriteLine($"Email: {contact.Email}");
Console.WriteLine($"Address: {contact.Address}");
}
catch (System.NullReferenceException)
{
Console.WriteLine("There is no contact");
}
}
}
/*
* 1. Add the required classes to make the following code compile.
* HINT: Use a Dictionary in the AddressBook class to store Contacts. The key should be the contact's email address.
*
* 2. Run the program and observe the exception.
*
* 3. Add try/catch blocks in the appropriate locations to prevent the program from crashing
* Print meaningful error messages in the catch blocks.
*
* // Focus on learning to read the error messages and be comfortable with it.
* System.NullReferenceException = most common C# error // Object Reference not set to an instance of an object.
* Stack trace - describes to you what part of the program stops running - the at
*/
static void Main(string[] args)
{
// Make it pretty
Console.Title = "Try Catch";
Console.ForegroundColor = ConsoleColor.Green;
// Create a few contacts
Contact bob = new Contact()
{
FirstName = "Bob",
LastName = "Smith",
Email = "*****@*****.**",
Address = "100 Some Ln, Testville, TN 11111"
};
Contact sue = new Contact()
{
FirstName = "Sue",
LastName = "Jones",
Email = "*****@*****.**",
Address = "322 Hard Way, Testville, TN 11111"
};
Contact juan = new Contact()
{
FirstName = "Juan",
LastName = "Lopez",
Email = "*****@*****.**",
Address = "888 Easy St, Testville, TN 11111"
};
// Create an AddressBook and add some contacts to it
AddressBook addressBook = new AddressBook();
addressBook.AddContact(bob);
addressBook.AddContact(sue);
addressBook.AddContact(juan);
// Try to addd a contact a second time
addressBook.AddContact(sue);
// Create a list of emails that match our Contacts
List <string> emails = new List <string>()
{
"*****@*****.**",
"*****@*****.**",
"*****@*****.**",
};
// Insert an email that does NOT match a Contact
// Indexes start at 0, so this throws an error
emails.Insert(1, "*****@*****.**");
// Search the AddressBook by email and print the information about each Contact
foreach (string email in emails)
{
// Instantiate contact - make it into a variable you can use again
Contact contact = addressBook.GetByEmail(email);
// If the contact returns null and none of those properties below return anything because contact is null
// Move on to the next contact
if (contact != null)
{
Console.WriteLine("----------------------------");
Console.WriteLine($"Name: {contact.FullName}");
Console.WriteLine($"Email: {contact.Email}");
Console.WriteLine($"Address: {contact.Address}");
}
// Don't need it, but it's good to specify what exactly is null
else
{
Console.WriteLine("----------------------------");
Console.WriteLine($"Contact is null for {email}");
}
}
}
