C# | SortedDictionary.Add() Method Last Updated : 21 Jan, 2019 Comments Improve Suggest changes Like Article Like Report This is used to add a specified key and value to the sorted dictionary. The elements are sorted according to TKey. Syntax: public void Add (TKey key, TValue value); Parameters: key: It is the key of the element to add. value: It is the value of the element to add. The value can be null for reference types. Exceptions: ArgumentNullException : If the key is null. ArgumentException : If an element with the same key already exists in the Dictionary. Below are the programs to illustrate the use of Dictionary<TKey, TValue>.Add() Method: Example 1: csharp // C# code to add the specified key // and value into the SortedDictionary using System; using System.Collections.Generic; class GFG { // Driver code public static void Main() { // Create a new SortedDictionary // of strings, with string keys. SortedDictionary<string, string> myDict = new SortedDictionary<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); // Displaying the key/value // pairs in myDict Console.WriteLine("The key/value pairs" + " in myDict are : "); foreach(KeyValuePair<string, string> kvp in myDict) { Console.WriteLine("Key = {0}, Value = {1}", kvp.Key, kvp.Value); } } } Output: Total key/value pairs in myDict are : 6 The key/value pairs in myDict are : Key = Australia, Value = Canberra Key = Belgium, Value = Brussels Key = China, Value = Beijing Key = India, Value = New Delhi Key = Netherlands, Value = Amsterdam Key = Russia, Value = Moscow Example 2: csharp // C# code to add the specified key // and value into the SortedDictionary using System; using System.Collections.Generic; class GFG { // Driver code public static void Main() { // Create a new SortedDictionary // of strings, with string keys. SortedDictionary<string, string> myDict = new SortedDictionary<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"); // The Add method throws an // exception if the new key is // already in the dictionary. try { myDict.Add("Russia", "Moscow"); } catch (ArgumentException) { Console.WriteLine("An element with Key " + "= \"Russia\" already exists."); } } } Output: An element with Key = "Russia" already exists. Note: A key cannot be null, but a value can be. If the value type TValue is a reference type. This method is an O(log n) operation, where n is Count of elements in the SortedDictionary. Reference: https://docs.microsoft.com/en-us/dotnet/api/system.collections.generic.sorteddictionary-2.add?view=netframework-4.7.2 Comment More infoAdvertise with us Next Article C# | SortedDictionary.Add() Method rupesh_rao Follow Improve Article Tags : C# CSharp-method CSharp-Generic-Namespace CSharp SortedDictionary Class Similar Reads C# | SortedDictionary.Clear() Method This method is used to remove all key/value pairs from the SortedDictionary<TKey, TValue>. Syntax: public void Clear (); Below are the programs to illustrate the use of the above-discussed method: Example 1: csharp // C# code to remove all pairs // from SortedDictionary using System; using Sys 2 min read C# | SortedDictionary.Remove() Method This method is used to remove the value with the specified key from the SortedDictionary<TKey, TValue>. Syntax: public bool Remove (TKey key); Return Value: This method returns true if the element is successfully found and removed; otherwise it returns false. This method returns false if key i 2 min read C# | SortedDictionary.ContainsValue() Method This method is used to check whether the SortedDictionary<TKey, TValue> contains an element with the specified value or not. Syntax: public bool ContainsValue (TValue value); Here, the value is the Value to locate in the SortedDictionary. The value can be null for reference types. Return Value 2 min read C# SortedDictionary Class In C#, the SortedDictionary<TKey,TValue> class represents the collection of key/value pairs. This pair is in sorted form and the sorting is done on the key. This class is defined under System.Collections.Generic namespace. 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Syntax: public int Count { get; } Return Value : It returns the number of key/value pairs contained in the SortedDictionary. Below are the programs to illustrate the use of above-discuss 2 min read C# | SortedDictionary.Keys Property This property is used to get a collection containing the keys in the SortedDictionary. Syntax: public System.Collections.Generic.SortedDictionary<TKey,TValue>.KeyCollection Keys { get; } Return Value : It returns a collection containing the keys in the SortedDictionary. Below are the programs 2 min read How to create an OrderedDictionary in C# OrderedDictionary() constructor is used to initialize a new instance of the OrderedDictionary class which will be empty and will have the default initial capacity. OrderedDictionary Class represents a collection of key/value pairs that are accessible by the key or index. It is present in System.Coll 2 min read C# OrderedDictionary Class In C#, the OrderedDictionary Class represents a collection of key/value pairs that are accessible by the key or index. It is present in System.Collections.Specialized namespace.It implements both IDicitonary and ICollection interfaces.Allows indexed access to elements via both keys and numeric index 6 min read Like