Page 97 - CSharp/C#

// Adding and changing data
people["John"] = 40; // Overwriting values this way is ok
people.Add("John", 40); // Throws ArgumentException since "John" already exists

// Iterating through contents
foreach(KeyValuePair<string, int> person in people)
{
Console.WriteLine("Name={0}, Age={1}", person.Key, person.Value);
}

foreach(string name in people.Keys)
{
Console.WriteLine("Name={0}", name);
}

foreach(int age in people.Values)
{
Console.WriteLine("Age={0}", age);
}

Duplicate key when using collection

initialization

var people = new Dictionary<string, int>
{
{ "John", 30 }, {"Mary", 35}, {"Jack", 40}, {"Jack", 40}
}; // throws ArgumentException since "Jack" already exists

Stack

// Initialize a stack object of integers
var stack = new Stack<int>();

// add some data
stack.Push(3);
stack.Push(5);
stack.Push(8);

// elements are stored with "first in, last out" order.
// stack from top to bottom is: 8, 5, 3

// We can use peek to see the top element of the stack.
Console.WriteLine(stack.Peek()); // prints 8

// Pop removes the top element of the stack and returns it.
Console.WriteLine(stack.Pop()); // prints 8
Console.WriteLine(stack.Pop()); // prints 5
Console.WriteLine(stack.Pop()); // prints 3

LinkedList

https://riptutorial.com/ 43