HybridDictionary.Keys property is used to get an ICollection containing the keys in the HybridDictionary.
Syntax:
public System.Collections.ICollection Keys { get; }
Return Value: It returns an ICollection containing the keys in the HybridDictionary.
Below programs illustrate the use of HybridDictionary.Keys Property:
Example 1:
// C# code to get an ICollection containing // the keys in the HybridDictionary. using System;
using System.Collections;
using System.Collections.Specialized;
class GFG {
// Driver code
public static void Main()
{
// Creating a HybridDictionary named myDict
HybridDictionary myDict = new HybridDictionary();
// Adding key/value pairs in myDict
myDict.Add( "A" , "Apple" );
myDict.Add( "B" , "Banana" );
myDict.Add( "C" , "Cat" );
myDict.Add( "D" , "Dog" );
myDict.Add( "E" , "Elephant" );
myDict.Add( "F" , "Fish" );
// Creating a String arr named myArr
String[] myArr = new String[myDict.Count];
// copying the Keys in HybridDictionary
// to a one-dimensional Array instance
// at the specified index.
myDict.Keys.CopyTo(myArr, 0);
// To get an ICollection containing
// the keys in the HybridDictionary
for ( int i = 0; i < myDict.Count; i++)
Console.WriteLine(myArr[i]);
}
} |
Output:
A B C D E F
Example 2:
// C# code to get an ICollection containing // the keys in the HybridDictionary. using System;
using System.Collections;
using System.Collections.Specialized;
class GFG {
// Driver code
public static void Main()
{
// Creating a HybridDictionary named myDict
HybridDictionary myDict = new HybridDictionary();
// Adding key/value pairs in myDict
myDict.Add( "I" , "first" );
myDict.Add( "II" , "second" );
myDict.Add( "III" , "third" );
myDict.Add( "IV" , "fourth" );
myDict.Add( "V" , "fifth" );
// Creating a String arr named myArr
String[] myArr = new String[myDict.Count];
// copying the Keys in HybridDictionary
// to a one-dimensional Array instance
// at the specified index.
myDict.Keys.CopyTo(myArr, 0);
// To get an ICollection containing
// the keys in the HybridDictionary
for ( int i = 0; i < myDict.Count; i++)
Console.WriteLine(myArr[i]);
}
} |
Output:
I II III IV V
Note:
- The order of the values in the ICollection is unspecified, but it is the same order as the associated values in the ICollection returned by the Values method.
- The returned ICollection is not a static copy. Instead, the ICollection refers back to the keys in the original HybridDictionary. Therefore, changes to the HybridDictionary continue to be reflected in the ICollection.
- Retrieving the value of this property is an O(1) operation.
Reference: