DictionaryExtensions Class
Definition
- Namespace
- Cuemon.Extensions.Collections.Generic
- Assemblies
- Cuemon.Extensions.Collections.Generic.dll
Extension methods for the IDictionary<TKey, TValue> interface.
public static class DictionaryExtensions- Inheritance
-
DictionaryExtensions
Examples
DictionaryExtensions provides extension methods for IDictionary<TKey, TValue> including CopyTo, TryAdd with a predicate, AddOrUpdate, GetValueOrDefault with a factory fallback, and TryGetValueOrFallback. This example creates a source dictionary with "alpha": 1 and "beta": 2, copies entries to a new dictionary via CopyTo, conditionally adds "gamma": 3 only if the key does not exist, updates "beta" to 20, retrieves "delta" with a fallback factory returning 42, and resolves a missing key using TryGetValueOrFallback. Console output confirms the destination count, fallback values, and the formatted key-value pairs.
using System;
using System.Collections.Generic;
using System.Linq;
using Cuemon.Extensions.Collections.Generic;
namespace MyApp.Examples
{
public static class DictionaryExtensionsExample
{
public static void Demonstrate()
{
IDictionary<string, int> source = new Dictionary<string, int>
{
["alpha"] = 1,
["beta"] = 2
};
var destination = new Dictionary<string, int>();
source.CopyTo(destination);
source.TryAdd("gamma", 3, dictionary => !dictionary.ContainsKey("gamma"));
source.AddOrUpdate("beta", 20);
var configuredFallback = source.GetValueOrDefault("delta", () => 42);
var foundFallback = source.TryGetValueOrFallback("missing", keys => keys.OrderBy(key => key).First(), out var fallbackValue);
var rows = source.ToEnumerable().Select(pair => $"{pair.Key}:{pair.Value}");
Console.WriteLine(destination.Count);
Console.WriteLine(configuredFallback);
Console.WriteLine(foundFallback);
Console.WriteLine(fallbackValue);
Console.WriteLine(string.Join(", ", rows));
}
}
}