C# | Get or set the value associated with the specified key in StringDictionary

StringDictionary is a specialized collection. It is found in the System.Collections.Specialized namespace. It only allows string keys and string values. It suffers from performance problems. It implements a hash table with the key and the value strongly typed to be strings rather than objects.

Below given are some examples to understand the implementation in a better way :

Example 1:

// C# code to get or set the value
// associated with the specified key
// in 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("G", "GeeksforGeeks");
        myDict.Add("C", "Coding");
        myDict.Add("DS", "Data Structures");
        myDict.Add("N", "Noida");
        myDict.Add("GC", "Geeks Classes");

        // Displaying the keys and values
        // in StringDictionary
        foreach(DictionaryEntry de in myDict)
        {
            Console.WriteLine(de.Key + " " + de.Value);
        }

        // To get the value corresponding to key "C"
        Console.WriteLine(myDict["C"]);

        // Changing the value corresponding to key "C"
        myDict["C"] = "C++";

        // To get the value corresponding to key "C"
        Console.WriteLine(myDict["C"]);

        // To get the value corresponding to key "N"
        Console.WriteLine(myDict["N"]);

        // Changing the value corresponding to key "N"
        myDict["N"] = "North";

        // To get the value corresponding to key "N"
        Console.WriteLine(myDict["N"]);

        // Displaying the keys and values
        // in StringDictionary
        foreach(DictionaryEntry de in myDict)
        {
            Console.WriteLine(de.Key + " " + de.Value);
        }
    }
}

Output:

gc Geeks Classes
c Coding
n Noida
ds Data Structures
g GeeksforGeeks
Coding
C++
Noida
North
c C++
g GeeksforGeeks
gc Geeks Classes
ds Data Structures
n North