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What is Sorted dictionaly in C# ?

  • C# SortedDictionary<TKey, TValue> class uses the concept of hashtable.
  • It stores values on the basis of key.
  • It contains unique keys and maintains ascending order on the basis of key.
  • By the help of key, we can easily search or remove elements.
  • It is found in System.Collections.Generic namespace.
 Sorted Dictionary

Sorted Dictionary

Sorted Dictionary Classes:

  • SortedList
  • SortedList
  • SortedDictionary
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Constructors:

Name Description
SortedDictionary<TKey, TValue>() Initializes a new instance of the SortedDictionary<TKey, TValue>
class that is empty and uses the default IComparer<T>
implementation for the key type.
SortedDictionary<TKey, TValue>(IComparer<TKey>) Initializes a new instance of the SortedDictionary<TKey, TValue>
class that is empty and uses the specified IComparer<T>
implementation to compare keys.
SortedDictionary
<TKey, TValue>(IDictionary<TKey, TValue>)
Initializes a new instance of the SortedDictionary<TKey, TValue>
class that contains elements copied from the specified IDictionary<TKey, TValue>
and uses the default IComparer<T> implementation for the key type.
SortedDictionary
<TKey, TValue>(IDictionary<TKey, TValue>, IComparer<TKey>)
Initializes a new instance of the SortedDictionary<TKey, TValue>
class that contains elements copied from the specified IDictionary<TKey, TValue>
and uses the specified IComparer<T> implementation to compare keys.

properties:

Namme Description
Comparer Gets the IComparer<T> used to order the elements of the SortedDictionary<TKey, TValue>.
Count Gets the number of key/value pairs contained in the SortedDictionary<TKey, TValue>.
Item[TKey] Gets or sets the value associated with the specified key.
Keys Gets a collection containing the keys in the SortedDictionary<TKey, TValue>.
Values Gets a collection containing the values in the SortedDictionary<TKey, TValue>.
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C# SortedDictionary<TKey, TValue> example:

  • Let's see an example of generic SortedDictionary<TKey, TValue> class that stores elements using Add() method and iterates elements using for-each loop.
  • Here, we are using KeyValuePair class to get key and value.
using System;  
using System.Collections.Generic;  
  
public class SortedDictionaryExample  
{  
    public static void Main(string[] args)  
    {  
        SortedDictionary<string, string> names = new SortedDictionary<string, 
string>();  
        names.Add("1","Sonoo");    
        names.Add("4","Peter");    
        names.Add("5","James");    
        names.Add("3","Ratan");    
        names.Add("2","Irfan");    
        foreach (KeyValuePair<string, string> kv in names)  
        {  
            Console.WriteLine(kv.Key+" "+kv.Value);  
        }  
    }  
}  

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C# examples - Output :

1 Sonoo
2 Irfan
3 Ratan
4 Peter
5 James


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