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C# Program to Demonstrate the IDictionary Interface

  • Last Updated : 05 Jan, 2022

IDictionary Interface is an interface that belongs to the collection module where we can access the elements by keys. Or we can say that the IDictionary interface is a collection of key/value pairs. It is available for both generic and non-generic types collection. Here each pair must contain a unique key and the value does not have to be null or can be null. The key/value pairs of non-generic IDictionary Interface are stored in a DictionaryEntery object and the key/value pairs of generic IDictionary Interface are stored in KeyValuePain<TKey, TValue> object.

Syntax:

public interface IDictionary : ICollection, IEnumerable

Or we can use the IDictionary interface by using the following syntax.

void Interface_name(IDictionary<key_datatype, value_datatype> object)
{
    // Methods............
    // Statements.........
}

where key_datatype represents the key datatype and value_datatype represents the value datatype

Property

Let us discuss the common properties of the IDictionary Interface:

  • IsFixedSize: This property gets a value indicating whether the IDictionary object has a fixed size.
  • IsReadOnly: This property gets a value indicating whether the IDictionary object is read-only.
  • Item: This property gets or sets the element with the specified key.
  • Keys: This property gets an ICollection object containing the keys of the IDictionary object.
  • Values: This property gets an ICollection object containing the values in the IDictionary object.
  • Count: This property is used to count the total number of elements present in ICollection.
  • IsSynchronized: This property is used to check whether the access to the ICollection is synchronized.

Method

Let us discuss the common methods of the IDictionary Interface:

  • Add: This method will add an element with the provided key and value to the IDictionary object.
  • Clear: This method will remove all the elements from the IDictionary object.
  • Contains: This method will check whether the IDictionary object contains an element with the specified key or not.
  • CopyTo: This method is used to copy the elements of ICollection to an array, starting from the given array index.
  • GetEnumerator: This method will return an IDictionaryEnumerator object for the IDictionary object.
  • Remove: This method will remove an element with the specified key.

In this article, we are going to create a dictionary and display the data using the IDictionary interface.

Approach

1. Create a dictionary with key and values as string type to store the data of students.

Dictionary<string, string> Student = new Dictionary<string, string>();

2. Add values to dictionary.

Student["Subject"] = "php";
Student["Subject"] = "java";

3. Create a method with IDictionary interface to display the data present in the dictionary.

static void Display(IDictionary<string, string> i)
{
    Console.WriteLine(i["Subject"]);
}

4. Call this method in the main method.

Display(Student);

Example:

C#




// C# program to display IDictionary Interface
using System;
using System.Collections.Generic;
 
class GFG{
 
// Display method with IDictionary interface
static void Display(IDictionary<string, string> i)
{
    Console.WriteLine(i["Subject"]);
}
 
// Driver code
static void Main()
{
     
    // Create a dictionary with student subjects
    Dictionary<string,
               string> Student = new Dictionary<string,
                                                string>();
                                                 
    // Assign the value
    Student["Subject"] = "php";
     
    // Call Display method
    Display(Student);
 
    // Assign the value
    Student["Subject"] = "java";
     
    // Call Display method
    Display(Student);
}
}

 Output:

php
java 

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