keynotfoundexception – Tarik Billa

When KeyNotFoundException is thrown, how do I see which key wasn’t found?

August 24, 2023 by Tarik

Custom exception: class WellknownKeyNotFoundException : KeyNotFoundException { public WellknownKeyNotFoundException(object key, string message) : this(key, message, null) { } public WellknownKeyNotFoundException(object key, string message, Exception innerException) : base(message, innerException) { this.Key = key; } public object Key { get; private set; } } Handy extension method: public TValue GetValue<TKey, TValue>(this IDictionary<TKey, TValue> dictionary, TKey key) { … Read more

Best way to handle a KeyNotFoundException

February 7, 2023 by Tarik

Use Dictionary.TryGetValue instead: Dictionary<int,string> dictionary = new Dictionary<int,string>(); int key = 0; dictionary[key] = “Yes”; string value; if (dictionary.TryGetValue(key, out value)) { Console.WriteLine(“Fetched value: {0}”, value); } else { Console.WriteLine(“No such key: {0}”, key); }