What is the method for using dictionaries in C#?

2 years ago
Liam
1 minute

In C#, a dictionary is a collection of key-value pairs used to store and access data, similar to a physical dictionary where each entry has a unique key and corresponding value.

Here are some common methods for using dictionaries in C#:

  1. Create a dictionary:
    Dictionary dictionary = new Dictionary();
  2. Add a key-value pair to the dictionary with the specified key and value.
  3. Retrieve the value:
    TValue value = dictionary[key];
  4. Update the value: dictionary[key] = newValue;
  5. Check if the key exists:
    bool exists = dictionary.ContainsKey(key);
  6. Delete the key-value pair from the dictionary:
    dictionary.Remove(key);
  7. Iterate through the dictionary:
    foreach(KeyValuePair pair in dictionary)
    {
    TKey key = pair.Key;
    TValue value = pair.Value;
    // Perform actions
    }
  8. Obtain the keys or values from the dictionary:
    ICollection keys = dictionary.Keys;
    ICollection values = dictionary.Values;

The above are some basic dictionary operation methods, more complex operations can be achieved by using other methods as needed.

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