C# | Dictionary.Keys Property - GeeksforGeeks

03 Apr, 2019
This property is used to get a collection containing the keys in the Dictionary.
Syntax:
public System.Collections.Generic.Dictionary<TKey, TValue>.KeyCollection Keys { get; }
Return Value : It returns a collection containing the keys in the Dictionary.
Below are the programs to illustrate the use of above-discussed property:
Example 1:
// C# code to get the keys// in the Dictionaryusing System;using System.Collections.Generic;  class GFG {      // Driver code    public static void Main()    {          // Create a new dictionary of        // strings, with string keys.        Dictionary<string, string> myDict =            new Dictionary<string, string>();          // Adding key/value pairs in myDict        myDict.Add("Australia", "Canberra");        myDict.Add("Belgium", "Brussels");        myDict.Add("Netherlands", "Amsterdam");        myDict.Add("China", "Beijing");        myDict.Add("Russia", "Moscow");        myDict.Add("India", "New Delhi");          // To get count of key/value pairs in myDict        Console.WriteLine("Total key/value pairs"+              " in myDict are : " + myDict.Count);          // To get the keys alone,         // use the Keys property.        Dictionary<string, string>.KeyCollection keyColl =                                               myDict.Keys;          // The elements of the KeyCollection        // are strongly typed with the type         // that was specified for dictionary         // keys        foreach(string s in keyColl)        {            Console.WriteLine("Key = {0}", s);        }    }}
Total key/value pairs in myDict are : 6
Key = Australia
Key = Belgium
Key = Netherlands
Key = China
Key = Russia
Key = India

Example 2:
// C# code to get the keys in the Dictionaryusing System;using System.Collections.Generic;  class GFG {      // Driver code    public static void Main()    {          // Create a new dictionary of        // strings, with string keys.        Dictionary<int, int> myDict =           new Dictionary<int, int>();          // Adding key/value pairs in myDict        myDict.Add(9, 8);        myDict.Add(3, 4);        myDict.Add(4, 7);        myDict.Add(1, 7);          // To get count of key/value pairs in myDict        Console.WriteLine("Total key/value pairs "+                "in myDict are : " + myDict.Count);          // To get the keys alone,         // use the Keys property.        Dictionary<int, int>.KeyCollection keyColl =                                        myDict.Keys;          // The elements of the KeyCollection        // are strongly typed with the type         // that was specified for dictionary keys.        foreach(int s in keyColl)        {            Console.WriteLine("Key = {0}", s);        }    }}
Total key/value pairs in myDict are : 4
Key = 9
Key = 3
Key = 4
Key = 1

Reference:
https://docs.microsoft.com/en-us/dotnet/api/system.collections.generic.dictionary-2.keys?view=netframework-4.7.2
CSharp Dictionary Class
CSharp-Generic-Namespace
C#
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