ListDictionary.Clear method is used to remove the all entries from the ListDictionary.
Syntax:
public void Clear ();
Below given are some examples to understand the implementation in a better way:
Example 1:
// C# code to remove all entries // from the ListDictionary 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();
// 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 (DictionaryEntry de in myDict)
{
Console.WriteLine(de.Key + " " + de.Value);
}
// Removing all entries from the ListDictionary
myDict.Clear();
// 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 (DictionaryEntry de in myDict)
{
Console.WriteLine(de.Key + " " + de.Value);
}
}
} |
Output:
Total key/value pairs in myDict are : 6 The key/value pairs in myDict are : Australia Canberra Belgium Brussels Netherlands Amsterdam China Beijing Russia Moscow India New Delhi Total key/value pairs in myDict are : 0 The key/value pairs in myDict are :
Example 2:
// C# code to remove all entries // from the ListDictionary 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();
// Adding key/value pairs in myDict
myDict.Add( "I" , "first" );
myDict.Add( "II" , "second" );
myDict.Add( "III" , "third" );
myDict.Add( "IV" , "fourth" );
myDict.Add( "V" , "fifth" );
// 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 (DictionaryEntry de in myDict)
{
Console.WriteLine(de.Key + " " + de.Value);
}
// Removing all entries from the ListDictionary
myDict.Clear();
// 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 (DictionaryEntry de in myDict)
{
Console.WriteLine(de.Key + " " + de.Value);
}
}
} |
Output:
Total key/value pairs in myDict are : 5 The key/value pairs in myDict are : I first II second III third IV fourth V fifth Total key/value pairs in myDict are : 0 The key/value pairs in myDict are :
Note:
- Count is set to zero, and references to other objects from elements of the collection are also released.
- This method is an O(1) operation.
Reference: