C# | Check if SortedDictionary contains the specified key or not

SortedDictionary<TKey, TValue>.ContainsKey(TKey) Method is used to check whether the SortedDictionary contains an element with the specified key or not. Syntax:

public bool ContainsKey (TKey key);

Here, the key is the Key which is to be located in the SortedDictionary. Returns Value: This method will return true if the Dictionary contains an element with the specified key otherwise, it returns false. Exception: This method will give ArgumentNullException if the key is null. Below are the programs to illustrate the use of the above-discussed method: Example 1: Example 2:

Reference:

• https://learn.microsoft.com/en-us/dotnet/api/system.collections.generic.sorteddictionary-2.containskey?view=netframework-4.7.2