Esta propiedad se usa para obtener una colección que contiene las claves en el Diccionario.
Sintaxis:
public System.Collections.Generic.Dictionary<TKey, TValue>.KeyCollection Keys { get; }
Valor devuelto: Devuelve una colección que contiene las claves del Diccionario.
A continuación se muestran los programas para ilustrar el uso de la propiedad mencionada anteriormente:
Ejemplo 1:
// C# code to get the keys
// in the Dictionary
using 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);
}
}
}
Producción:
Total key/value pairs in myDict are : 6 Key = Australia Key = Belgium Key = Netherlands Key = China Key = Russia Key = India
Ejemplo 2:
// C# code to get the keys in the Dictionary
using 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);
}
}
}
Producción:
Total key/value pairs in myDict are : 4 Key = 9 Key = 3 Key = 4 Key = 1
Referencia:
Publicación traducida automáticamente
Artículo escrito por rupesh_rao y traducido por Barcelona Geeks. The original can be accessed here. Licence: CCBY-SA