How do you iterate over a Dictionary?

Q: How do you iterate over a Dictionary ?

Short answer: Use a foreach loop with KeyValuePair : foreach (KeyValuePair pair in dictionary) Example code { Console.WriteLine($"Key: {pair.Key}, Value: {pair.Value}"); } Or use deconstruction (C# 7+): foreach (var (key, value) in dictionary) { Console.WriteLine($"{key} = {value}"); } Real-world example (ShopNest) ShopNest caches product prices in a Dictionary keyed by SKU so checkout can look up a price in O(1) instead of scanning a list. Say this in the interview Define — one clear sentence (the short answer above). Example — relate it to a project like ShopNest or your real work. Trade-off — when you would not use it.

Question

How do you iterate over a Dictionary<TKey, TValue>?

Accepted Answer

Short answer: Use a foreach loop with KeyValuePair: foreach (KeyValuePair pair in dictionary) Example code { Console.WriteLine($"Key: {pair.Key}, Value: {pair.Value}"); } Or use deconstruction (C# 7+): foreach (var (key, value) in dictionary) { Console.WriteLine($"{key} = {value}"); } Real-world example (ShopNest) ShopNest caches product prices in a Dictionary keyed by SKU so checkout can look up a price in O(1) instead of scanning a list. Say this in the interview Define — one clear sentence (the short answer above). Example — relate it to a project like ShopNest or your real work. Trade-off — when you would not use it.