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C# | Copying the SortedList elements to an Array Object

Last Updated : 11 Jul, 2025
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SortedList.CopyTo(Array, Int32) Method is used to copy SortedList elements to a one-dimensional Array object, starting at the specified index in the array. Syntax: 
public virtual void CopyTo (Array array, int arrayIndex);
Parameters:
array: It is the one-dimensional Array object that is the destination of the DictionaryEntry objects copied from SortedList. The Array must have zero-based indexing. arrayindex: It is the zero-based index in array at which copying begins.
Exceptions:
  • ArgumentNullException: If the array is null.
  • ArgumentOutOfRangeException: If the arrayindex is less than zero.
  • ArgumentException: If the array is multidimensional or the number of elements in the source SortedList object is greater than the available space from arrayIndex to the end of the destination array.
  • InvalidCastException: If the type of the source SortedList cannot be cast automatically to the type of the destination array.
Below programs illustrate the use of above-discussed method: Example 1: CSharp 
// C# code to copy the SortedList elements
// to a 1-D Array object, starting at the
// specified index in the array
using System;
using System.Collections;

class Geeks {

    // Main Method
    public static void Main(String[] args)
    {

        // Creating a SortedList of integers
        SortedList mylist = new SortedList();

        // Adding elements to SortedList
        mylist.Add("1", "C#");
        mylist.Add("2", "Java");
        mylist.Add("3", "DSA");
        mylist.Add("4", "Python");
        mylist.Add("5", "C");

        // creating a 1-D array
        DictionaryEntry[] myArr = new DictionaryEntry[mylist.Count];

        // Copying SortedList to Array
        // instance at the specified index
        mylist.CopyTo(myArr, 0);

        // Displaying elements in myArr
        for (int i = 0; i < myArr.Length; i++) {
            Console.WriteLine(myArr[i].Key + "-->" + myArr[i].Value);
        }
    }
}
Output: 
1-->C#
2-->Java
3-->DSA
4-->Python
5-->C
Example 2: CSharp 
// C# code to copy the SortedList elements
// to a 1-D Array object, starting at the
// specified index in the array
using System;
using System.Collections;

class Geeks {

    // Main Method
    public static void Main(String[] args)
    {

        // Creating a SortedList of integers
        SortedList mylist = new SortedList();

        // Adding elements to SortedList
        mylist.Add("1st", "Ram");
        mylist.Add("2nd", "Shyam");
        mylist.Add("3rd", "Rohit");
        mylist.Add("4th", "Manish");
        mylist.Add("5th", "Vikas");

        // creating a 1-D array
        DictionaryEntry[] myArr = new DictionaryEntry[mylist.Count];

        // Copying SortedList to Array
        // instance at the specified index
        // This will raise "ArgumentOutOfRangeException"
        // as index is less than 0
        mylist.CopyTo(myArr, -2);

        // Displaying elements in myArr
        for (int i = 0; i < myArr.Length; i++) {
            Console.WriteLine(myArr[i].Key + "-->" + myArr[i].Value);
        }
    }
}
Runtime Error:
Unhandled Exception: System.ArgumentOutOfRangeException: Non-negative number required. Parameter name: arrayIndex
Reference:

K

Kirti_Mangal
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