Pro EP 102 : What is the purpose of dictionaries in C#?
What is the purpose of dictionaries in C#?
In C#, a dictionary is a data structure that stores key-value pairs
You should use a dictionary when you need to associate unique keys with corresponding values and quickly look up or manipulate values based on those keys.
Here are few key points about dictionaries :
1) Dictionaries in C# store data as unique key-value pairs.
2) Dictionaries offer quick access times for values based on their keys, making them efficient for retrieval operations.
3) Employ dictionaries when you need to organize and access data through a mapping between distinct keys and corresponding values
4) Dictionaries in C# are implemented with hash tables, providing average-case O(1) time complexity for lookups
Methods and properties of Dictionaries :
1) Add(key, value): Adds a key-value pair to the dictionary.
2) Remove(key): Removes the entry with the specified key from the dictionary.
3) ContainsKey(key): Determines whether the dictionary contains a specific key.
4) TryGetValue(key, out value): Retrieves the value associated with the specified key, if the key exists.
5) Keys: Gets a collection of all keys in the dictionary.
6) Values: Gets a collection of all values in the dictionary.
7) Count: Gets the number of key-value pairs in the dictionary.
8) Clear(): Removes all key-value pairs from the dictionary.
9) ContainsValue(value): Determines whether the dictionary contains a specific value.
10) GetEnumerator(): Returns an enumerator for iterating through the key-value pairs.
11) Item[key]: Gets or sets the value associated with the specified key.
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