C# | Removing all entries from the StringDictionary

Last Updated : 01 Feb, 2019

StringDictionary.Clear method is used to remove all the entries from the StringDictionary. Syntax:

  public virtual void Clear ();

Exception: This method will give the NotSupportedException if the StringDictionary is read-only. Example:

CSHARP

// C# code to remove all entries // from the StringDictionary using System; using System.Collections; using System.Collections.Specialized;  class GFG {      // Driver code     public static void Main()     {          // Creating a StringDictionary named myDict         StringDictionary myDict = new StringDictionary();          // Adding key and value into the StringDictionary         myDict.Add("A", "Apple");         myDict.Add("B", "Banana");         myDict.Add("C", "Cat");         myDict.Add("D", "Dog");         myDict.Add("E", "Elephant");         myDict.Add("F", "Fish");          // Displaying the keys and values in StringDictionary         Console.WriteLine("The number of key/value pairs are : " + myDict.Count);          foreach(DictionaryEntry dic in myDict)         {             Console.WriteLine(dic.Key + " " + dic.Value);         }          // Removing all entries from the StringDictionary         myDict.Clear();          // Displaying the keys and values in StringDictionary         Console.WriteLine("The number of key/value pairs are : " + myDict.Count);          foreach(DictionaryEntry dic in myDict)         {             Console.WriteLine(dic.Key + " " + dic.Value);         }     } }

Output:

  The number of key/value pairs are : 6  b Banana  c Cat  a Apple  f Fish  d Dog  e Elephant  The number of key/value pairs are : 0

Note: This method is an O(n) operation, where n is Count. Reference:

https://docs.microsoft.com/en-us/dotnet/api/system.collections.specialized.stringdictionary.clear?view=netframework-4.7.2

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