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30 cze 2020 · You should be able to just look at .Keys: Dictionary<string, int> data = new Dictionary<string, int>(); data.Add("abc", 123); data.Add("def", 456); foreach (string key in data.Keys) { Console.WriteLine(key); }
The following code example shows how to enumerate the keys in the dictionary using the Keys property, and how to enumerate the keys and values in the dictionary. This code is part of a larger example that can be compiled and executed ( openWith is the name of the Dictionary used in this example).
Every key in a Dictionary<TKey,TValue> must be unique according to the dictionary's equality comparer. A key cannot be null, but a value can be, if its type TValue is a reference type. Dictionary<TKey,TValue> requires an equality implementation to determine whether keys are equal.
How do I get a Dictionary key by value in C#? Dictionary<string, string> types = new Dictionary<string, string>() {"1", "one"}, {"2", "two"}, {"3", "three"} }; I want something like this: getByValueKey(string value); getByValueKey("one") must be return "1". What is the best way do this? Maybe HashTable or SortedLists? c# dictionary.
Groups the elements of a sequence according to a specified key selector function and creates a result value from each group and its key. Key values are compared by using a specified comparer, and the elements of each group are projected by using a specified function.
Learn how to use the Dictionary class in C# to store and manipulate key-value pairs in no particular order. See examples of creating, accessing, updating, and removing elements in a dictionary, and how to handle duplicate and null keys.
The Dictionary<TKey,TValue> class represents a collection of keys and values. It belongs to the System.Collections.Generic namespace. The TKey and TValue are the types of keys and values in the dictionary. Every key in a dictionary must be unique. Also, a key cannot be null if its type is a reference type.
