SortedList.Keys Property is used to get the keys in a SortedList object.
Syntax:
public virtual System.Collections.ICollection Keys { get; }
Property Value: An ICollection object containing the keys in the SortedList object.
Below programs illustrate the use of above-discussed property:
Example 1:
// C# code to get an ICollection containing // the keys in the SortedList using System;
using System.Collections;
class GFG {
// Driver code
public static void Main()
{
// Creating a SortedList
SortedList mylist = new SortedList();
// Adding elements in SortedList
mylist.Add( "4" , "Even" );
mylist.Add( "9" , "Odd" );
mylist.Add( "5" , "Odd and Prime" );
mylist.Add( "2" , "Even and Prime" );
// Get a collection of the keys.
ICollection c = mylist.Keys;
// Displaying the contents
foreach ( string str in c)
Console.WriteLine(str + ": " + mylist[str]);
}
} |
Output:
2: Even and Prime 4: Even 5: Odd and Prime 9: Odd
Example 2:
// C# code to get an ICollection containing // the keys in the SortedList. using System;
using System.Collections;
class GFG {
// Driver code
public static void Main()
{
// Creating a SortedList
SortedList mylist = new SortedList();
// Adding elements in SortedList
mylist.Add( "India" , "Country" );
mylist.Add( "Chandigarh" , "City" );
mylist.Add( "Mars" , "Planet" );
mylist.Add( "China" , "Country" );
// Get a collection of the keys.
ICollection c = mylist.Keys;
// Displaying the contents
foreach ( string str in c)
Console.WriteLine(str + ": " + mylist[str]);
}
} |
Output:
Chandigarh: City China: Country India: Country Mars: Planet
Note:
- The ICollection object is a read-only view of the keys of the SortedList object. Modifications made to the underlying SortedList are immediately reflected in the ICollection.
- The elements of the ICollection are sorted in the same order as the keys of the SortedList.
- This property is similar to the GetKeyList method but returns an ICollection object instead of an IList object.
- This method is an O(1) operation.
Reference: