C# | Get a read-only copy of the OrderedDictionary

Last Updated : 01 Feb, 2019

OrderedDictionary.AsReadOnly method returns a read-only copy of the current OrderedDictionary collection.

Syntax:

public System.Collections.Specialized.OrderedDictionary AsReadOnly ();

Return Value: A read-only copy of the current OrderedDictionary collection.

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

Example 1:

// C# code to get a read-only 
// copy of the 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"); 
  
        // To Get a read-only copy of 
        // the OrderedDictionary 
        OrderedDictionary myDict_1 = myDict.AsReadOnly(); 
  
        // Checking if myDict_1 is read-only 
        Console.WriteLine(myDict_1.IsReadOnly); 
    } 
} 

Output:

True

Example 2:

// C# code to get a read-only 
// copy of the 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"); 
  
        // To Get a read-only copy of 
        // the OrderedDictionary 
        OrderedDictionary myDict_1 = myDict.AsReadOnly(); 
  
        // Checking if myDict_1 is read-only 
        Console.WriteLine(myDict_1.IsReadOnly); 
    } 
} 

Output:

True

Note: The AsReadOnly method creates a read-only wrapper around the current OrderedDictionary collection. Changes made to the OrderedDictionary collection are reflected in the read-only copy.

Reference:

https://docs.microsoft.com/en-us/dotnet/api/system.collections.specialized.ordereddictionary.asreadonly?view=netframework-4.7.2

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