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When you call the Contains method, Dictionary does an internal search to find its index. If it returns true, you need another index search to get the actual value. When you use TryGetValue, it searches only once for the index and if found, it assigns the value to your variable.
The Dictionary<TKey,TValue> generic class provides a mapping from a set of keys to a set of values. Each addition to the dictionary consists of a value and its associated key. Retrieving a value by using its key is very fast, close to O(1), because the Dictionary<TKey,TValue> class is implemented as a hash table.
Dictionary in C# is the generic collection type in the System.Collection.Generics namespace that contains Keys and Values.
7 sie 2009 · Use LINQ: Access to dictionary for the key and change the value. Dictionary<string, int> dict = new Dictionary<string, int>(); dict = dict.ToDictionary(kvp => kvp.Key, kvp => kvp.Value + 1);
With C# 6.0, you can create a dictionary in the following way: var dict = new Dictionary<string, int> { ["one"] = 1, ["two"] = 2, ["three"] = 3 }; It even works with custom types.
A Dictionary<TKey,TValue>.ValueCollection containing the values in the Dictionary<TKey,TValue>. Examples. This code example shows how to enumerate the values in the dictionary using the Values property, and how to enumerate the keys and values in the dictionary.
To add the specified key and value to a dictionary, you use the Add() method. For example, the following adds three key/value pairs to the states dictionary: var states = new Dictionary< string , string >(); states.Add( "CA" , "California" ); states.Add( "TX" , "Texas" ); states.Add( "NY" , "New York" ); Code language: C# ( cs )
