OrderedDictionary.Clear method is used to remove all elements from the OrderedDictionary collection.
Syntax:
public void Clear ();
Exception: If the OrderedDictionary collection is read-only then it will throw NotSupportedException.
Below given are some examples to understand the implementation in a better way:
Example 1:
// C# code to remove all elements // from OrderedDictionary using System;
using System.Collections;
using System.Collections.Specialized;
class GFG {
// Driver method
public static void Main()
{
// Creating a orderedDictionary named myDict
OrderedDictionary myDict = new OrderedDictionary();
// Adding key and value in myDict
myDict.Add( "key1" , "value1" );
myDict.Add( "key2" , "value2" );
myDict.Add( "key3" , "value3" );
myDict.Add( "key4" , "value4" );
myDict.Add( "key5" , "value5" );
// Displaying the number of element initially
Console.WriteLine( "Number of elements are : " + myDict.Count);
// Displaying the elements in myDict
foreach (DictionaryEntry de in myDict)
Console.WriteLine(de.Key + " -- " + de.Value);
// Removing all elements from OrderedDictionary
myDict.Clear();
// Displaying the number of element initially
Console.WriteLine( "Number of elements are : " + myDict.Count);
// Displaying the elements in myDict
foreach (DictionaryEntry de in myDict)
Console.WriteLine(de.Key + " -- " + de.Value);
}
} |
Output:
Number of elements are : 5 key1 -- value1 key2 -- value2 key3 -- value3 key4 -- value4 key5 -- value5 Number of elements are : 0
Example 2:
// C# code to remove all elements // from OrderedDictionary using System;
using System.Collections;
using System.Collections.Specialized;
class GFG {
// Driver method
public static void Main()
{
// Creating a orderedDictionary named myDict
OrderedDictionary myDict = new OrderedDictionary();
// Adding key and value in myDict
myDict.Add( "A" , "Apple" );
myDict.Add( "B" , "Banana" );
myDict.Add( "C" , "Cat" );
myDict.Add( "D" , "Dog" );
// Displaying the number of element initially
Console.WriteLine( "Number of elements are : " + myDict.Count);
// Displaying the elements in myDict
foreach (DictionaryEntry de in myDict)
Console.WriteLine(de.Key + " -- " + de.Value);
// Removing all elements from OrderedDictionary
myDict.Clear();
// Displaying the number of element initially
Console.WriteLine( "Number of elements are : " + myDict.Count);
// Displaying the elements in myDict
foreach (DictionaryEntry de in myDict)
Console.WriteLine(de.Key + " -- " + de.Value);
}
} |
Output:
Number of elements are : 4 A -- Apple B -- Banana C -- Cat D -- Dog Number of elements are : 0
Note:
- After calling the Clear method, the Count property is set to zero.
- References to other objects from elements of the collection are also released.
- The capacity of dictionary is not changed as a result of calling this method.
Reference: