C# | Copy ListDictionary to Array instance at the specified index Last Updated : 01 Feb, 2019 Comments Improve Suggest changes Like Article Like Report ListDictionary.CopyTo(Array, Int32) method is used to copy the ListDictionary entries to a one-dimensional Array instance at the specified index. Syntax: public void CopyTo (Array array, int index); Parameters: array : It is the one-dimensional Array which is the destination of the DictionaryEntry objects copied from ListDictionary. The Array must have zero-based indexing. index : The zero-based index in array at which copying begins. Exceptions: ArgumentNullException : If the array is null. ArgumentOutOfRangeException : If the index is less than zero. InvalidCastException : If the type of the source ListDictionary cannot be cast automatically to the type of the destination array. ArgumentException : If the array is multidimensional OR the number of elements in the source ListDictionary is greater than the available space from index to the end of the destination array. Below given are some examples to understand the implementation in a better way: Example 1: CSHARP // C# code to copy ListDictionary to // Array instance at the specified index using System; using System.Collections; using System.Collections.Specialized; class GFG { // Driver code public static void Main() { // Creating a ListDictionary named myDict ListDictionary myDict = new ListDictionary(); 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"); DictionaryEntry[] myArr = new DictionaryEntry[myDict.Count]; // Copying ListDictionary to Array // instance at the specified index myDict.CopyTo(myArr, 0); // Displaying elements in myArr for (int i = 0; i < myArr.Length; i++) { Console.WriteLine(myArr[i].Key + "-->" + myArr[i].Value); } } } Output: Australia-->Canberra Belgium-->Brussels Netherlands-->Amsterdam China-->Beijing Russia-->Moscow India-->New Delhi Example 2: CSHARP // C# code to copy ListDictionary to // Array instance at the specified index using System; using System.Collections; using System.Collections.Specialized; class GFG { // Driver code public static void Main() { // Creating a ListDictionary named myDict ListDictionary myDict = new ListDictionary(); 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"); DictionaryEntry[] myArr = new DictionaryEntry[myDict.Count]; // Copying ListDictionary to Array // instance at the specified index // This should raise "ArgumentOutOfRangeException" // as index is less than 0 myDict.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: Index is less than zero. Parameter name: index Note: The elements are copied to the Array in the same order in which the enumerator iterates through the ListDictionary. To copy only the keys in the ListDictionary, use ListDictionary.Keys.CopyTo. To copy only the values in the ListDictionary, use ListDictionary.Values.CopyTo. This method is an O(n) operation, where n is Count. Reference: https://docs.microsoft.com/en-us/dotnet/api/system.collections.specialized.listdictionary.copyto?view=netframework-4.7.2 Comment More infoAdvertise with us Next Article C# | Copy ListDictionary to Array instance at the specified index S Sahil_Bansall Follow Improve Article Tags : C# CSharp-method CSharp-Specialized-Namespace CSharp-Specialized-ListDictionary Similar Reads C# | Copy OrderedDictionary elements to Array instance at the specified index OrderedDictionary.CopyTo(Array, Int32) method is used to copy the OrderedDictionary elements to a one-dimensional Array object at the specified index. 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