/*
* 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);
// Try to addd a contact a second time
addressBook.AddContact(sue);
}
catch
{
Console.WriteLine("Contact already exists in address book.");
}
//without try/catch, this error occurs:
//Unhandled Exception: System.ArgumentException: An item with the same key has already been added.
//Key: [email protected]
// 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
//without try/catch, this error occurs (line with contact.FullName):
//Unhandled Exception: System.NullReferenceException: Object reference not set to an instance of an object.
//from microsoft docs: a NullReferenceException is thrown when you try to access
//a member on a type whose value is null
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($"Address: {contact.Address}");
}
catch (System.NullReferenceException)
{
Console.WriteLine("Null problems sorry!");
}
}
}
/*
* 1. Add the required classes to make the following code compile.
* HINT: Use a Dictionary in the AddressBook class to store Contacts. The key should be the contact's email address.
*
* 2. Run the program and observe the exception.
*
* 3. Add try/catch blocks in the appropriate locations to prevent the program from crashing
* Print meaningful error messages in the catch blocks.
*/
static void Main(string[] args)
{
// Create a few contacts
Contact garrett = new Contact()
{
FirstName = "Garrett", LastName = "Kent",
Email = "*****@*****.**",
Address = "100 Bro Ln, Broville, TN 11111"
};
Contact keith = new Contact()
{
FirstName = "Keith", LastName = "Rutkowski",
Email = "*****@*****.**",
Address = "666 Bitch St, Bitchville, TN 00000"
};
Contact jon = new Contact()
{
FirstName = "Jon", LastName = "Riley",
Email = "*****@*****.**",
Address = "100 Precedence Way, Squadville, TN 11111"
};
// Create an AddressBook and add some contacts to it
AddressBook addressBook = new AddressBook();
addressBook.AddContact(garrett);
addressBook.AddContact(keith);
addressBook.AddContact(jon);
// Try to addd a contact a second time
addressBook.AddContact(keith);
// Create a list of emails that match our Contacts
List <string> emails = new List <string> ()
{
"*****@*****.**",
"*****@*****.**",
"*****@*****.**",
};
// Insert an email that does NOT match a Contact
emails.Insert(1, "*****@*****.**");
// Search the AddressBook by email and print the information about each Contact
foreach (string email in emails)
{
try
{
Contact contact = addressBook.GetByEmail(email);
Console.WriteLine("----------------------------");
Console.WriteLine($"Name: {contact.FullName}");
Console.WriteLine($"Email: {contact.Email}");
Console.WriteLine($"Address: {contact.Address}");
}
catch (KeyNotFoundException)
{
Console.WriteLine("----------------------------");
Console.WriteLine("We live in a society!");
}
}
}
/*
* 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();
addressBook.AddContact(bob);
addressBook.AddContact(sue);
addressBook.AddContact(juan);
// Try to addd a contact a second time
try
{
addressBook.AddContact(sue);
}
catch (ArgumentException)
{
Console.WriteLine("This person already exists in address book");
}
// 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($"Address: {contact.Address}");
Console.WriteLine("----------------------------");
}
catch (KeyNotFoundException)
{
Console.WriteLine($"{email} could not be found.");
}
}
}
/*
* 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
Contacts bob = new Contacts()
{
FirstName = "Bob",
LastName = "Smith",
Email = "*****@*****.**",
Address = "100 Some Ln, Testville, TN 11111"
};
Contacts sue = new Contacts()
{
FirstName = "Sue",
LastName = "Jones",
Email = "*****@*****.**",
Address = "322 Hard Way, Testville, TN 11111"
};
Contacts juan = new Contacts()
{
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
try{
addressBook.AddContact(sue);
}
catch {
Console.WriteLine("uh oh, you made a mistake sir... or miss");
}
// 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
{
// List<string> emailIds = new List<string>() {0, 1, 2, 3};
{
Contacts Contacts = addressBook.GetByEmail(email);
Console.WriteLine("----------------------------");
Console.WriteLine($"Name: {Contacts.FullName}");
Console.WriteLine($"Email: {Contacts.Email}");
Console.WriteLine($"Address: {Contacts.Address}");
}
}
catch
(KeyNotFoundException)
{
Console.WriteLine("-----------------");
Console.WriteLine("Something went wrong!");
}
}
}
