Dictionary key-value collection in C Sharp (C#) - Mini Project: Build & Apply

Dictionary key-value collection

📖 Scenario: You are managing a small store's inventory. You want to keep track of product names and their quantities using a dictionary.

🎯 Goal: Create a dictionary to store product names as keys and their quantities as values. Then, update and display the inventory.

📋 What You'll Learn

Create a dictionary called inventory with exact product-quantity pairs

Add a new product quantity variable called newProductQuantity

Use a foreach loop with variables product and quantity to iterate over inventory

Print the product names and their quantities exactly as specified

💡 Why This Matters

🌍 Real World

Stores and businesses use dictionaries to keep track of products and their quantities efficiently.

💼 Career

Understanding dictionaries is essential for managing data collections in software development and database management.

1

Create the inventory dictionary

Create a dictionary called inventory with these exact entries: "Apples" with quantity 30, "Bananas" with quantity 15, and "Oranges" with quantity 25.

C Sharp (C#)

# Your code here

Need a hint?

Use new Dictionary<string, int>() and add the exact key-value pairs inside curly braces.

2

Add a new product quantity variable

Add an integer variable called newProductQuantity and set it to 20.

C Sharp (C#)

using System.Collections.Generic;

Dictionary inventory = new Dictionary()
{
    {"Apples", 30},
    {"Bananas", 15},
    {"Oranges", 25}
};

// Your code here

Need a hint?

Declare an integer variable with the exact name and value.

3

Iterate over the inventory dictionary

Use a foreach loop with variables product and quantity to iterate over inventory. Inside the loop, add newProductQuantity to each quantity and update the dictionary value.

C Sharp (C#)

using System.Collections.Generic;

Dictionary inventory = new Dictionary()
{
    {"Apples", 30},
    {"Bananas", 15},
    {"Oranges", 25}
};

int newProductQuantity = 20;

// Your code here

Need a hint?

Since you cannot change dictionary values while iterating keys directly, first copy keys to a list, then update values inside the loop.

4

Print the updated inventory

Use a foreach loop with variables product and quantity to iterate over inventory. Print each product and its quantity in the format: "Product: {product}, Quantity: {quantity}".

C Sharp (C#)

using System.Collections.Generic;

Dictionary inventory = new Dictionary()
{
    {"Apples", 30},
    {"Bananas", 15},
    {"Oranges", 25}
};

int newProductQuantity = 20;

List keys = new List(inventory.Keys);
foreach (string product in keys)
{
    inventory[product] += newProductQuantity;
}

// Your code here

Need a hint?

Use Console.WriteLine with string interpolation to print each product and quantity.