Both types are generic, so they can be any. using How to Add Elements to a C# Dictionary?Ĭ# Dictionary class constructor takes a key data type and a value data type. Each key must be unique in the collection.īefore you use the Dictionary class in your code, you must import the namespace using the following line. The Dictionary class is defined in the generic namespace is a class that can store any data type in keys and values. To store a mapping of product IDs to product prices.Ĭ# Dictionary class is a generic collection of keys and values pair of data.To store a mapping of user IDs to user profiles.To store a mapping of words to their definitions.To store a mapping of countries to capital cities.To store a mapping of names to phone numbers.Here are some examples of when you might use a dictionary in C#: They can be memory-intensive if they store a large number of key-value pairs.They can be slow for iterating over all the key-value pairs.Here are some of the disadvantages of using dictionaries in C#: They can be used to store a large number of key-value pairs.They are very efficient for accessing values by their keys.Here are some of the advantages of using dictionaries in C#:
#Add dict to dict python code#
For example, the following code iterates over the keys in the dictionary and prints them to the console: foreach (string key in dictionary.Keys()) You can also iterate over the keys or values in a dictionary using the Keys() or Values() methods. For example, the following code retrieves the value associated with the key "one": int value = dictionary.Get("one") You can retrieve a value from a dictionary by its key using the Get() method.
For example, the following code adds two key-value pairs to the dictionary: dictionary.Add("one", 1) You can add key-value pairs to a dictionary using the Add() method. For example, the following code creates a dictionary that can store strings as keys and integers as values: Dictionary dictionary = new Dictionary()
To create a dictionary in C#, you use the Dictionary class, where TKey is the type of the keys, and TValue is the type of the values. Dictionaries are implemented as hash tables so their keys can quickly access them. The keys must be unique, but the values can be duplicated. A C# dictionary is a generic collection of key-value pairs.
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