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Dictionary.Clear Method in C#
The Dictionary.Clear() method in C# removes all key/value pairs from the Dictionary<TKey,TValue>.
Syntax
public void Clear();
Let us now see an example to implement the Dictionary.Clear() method −
Example
using System; using System.Collections.Generic; public class Demo { public static void Main(){ Dictionary<string, string> dict = new Dictionary<string, string>(); dict.Add("One", "John"); dict.Add("Two", "Tom"); dict.Add("Three", "Jacob"); dict.Add("Four", "Kevin"); dict.Add("Five", "Nathan"); Console.WriteLine("Count of elements = "+dict.Count); Console.WriteLine("
Key/value pairs..."); foreach(KeyValuePair<string, string> res in dict){ Console.WriteLine("Key = {0}, Value = {1}", res.Key, res.Value); } dict.Clear(); Console.WriteLine("Cleared Key/value pairs..."); foreach(KeyValuePair<string, string> res in dict){ Console.WriteLine("Key = {0}, Value = {1}", res.Key, res.Value); } Console.WriteLine("Count of elements now = "+dict.Count); } }
Output
This will produce the following output −
Count of elements = 5 Key/value pairs... Key = One, Value = John Key = Two, Value = Tom Key = Three, Value = Jacob Key = Four, Value = Kevin Key = Five, Value = Nathan Cleared Key/value pairs... Count of elements now = 0
Let us now see another example to implement the Dictionary.Clear() method −
Example
using System; using System.Collections.Generic; public class Demo { public static void Main(){ Dictionary<string, string> dict = new Dictionary<string, string>(); dict.Add("One", "John"); dict.Add("Two", "Tom"); dict.Add("Three", "Jacob"); dict.Add("Four", "Kevin"); dict.Add("Five", "Nathan"); Console.WriteLine("Count of elements = "+dict.Count); dict.Add("Six", "Anne"); dict.Add("Seven", "Katoe"); Console.WriteLine("Count of elements (updated) = "+dict.Count); Console.WriteLine("Key/value pairs..."); foreach(KeyValuePair<string, string> res in dict){ Console.WriteLine("Key = {0}, Value = {1}", res.Key, res.Value); } dict.Clear(); Console.WriteLine("Cleared Key/value pairs..."); foreach(KeyValuePair<string, string> res in dict){ Console.WriteLine("Key = {0}, Value = {1}", res.Key, res.Value); } } }
Output
This will produce the following output −
Count of elements = 5 Count of elements (updated) = 7 Key/value pairs... Key = One, Value = John Key = Two, Value = Tom Key = Three, Value = Jacob Key = Four, Value = Kevin Key = Five, Value = Nathan Key = Six, Value = Anne Key = Seven, Value = Katoe Cleared Key/value pairs...
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