C# | Remove the entry at specified index from OrderedDictionary

Last Updated : 01 Feb, 2019

OrderedDictionary.RemoveAt(Int32) method is used to remove the entry at the specified index from the OrderedDictionary collection.

Syntax:

public void RemoveAt (int index);

Here, index is the zero-based index of the entry to remove.

Exceptions:

NotSupportedException : If the OrderedDictionary collection is read-only.
ArgumentOutOfRangeException : If the index is less than zero OR index is equal to or greater than Count.

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

Example 1:

// C# code to remove the entry at 
// the specified index from 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"); 
  
        // 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 the entry at the specified 
        // index from the OrderedDictionary 
        myDict.RemoveAt(3); 
  
        // 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 : 4
key1 -- value1
key2 -- value2
key3 -- value3
key5 -- value5

Example 2:

// C# code to remove the entry at 
// the specified index from 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"); 
  
        // 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 the entry at the specified 
        // index from the OrderedDictionary 
        // This should raise "ArgumentOutOfRangeException" 
        // as index is less than 0 
        myDict.RemoveAt(-2); 
  
        // 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); 
    } 
} 

Runtime Error:

Unhandled Exception:
System.ArgumentOutOfRangeException: Specified argument was out of the range of valid values.
Parameter name: index

Note: The entries that follow the removed entry move up to occupy the vacated spot and the indexes of the entries that move are also updated.

Reference:

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

C# | Remove all elements from OrderedDictionary

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C# | Remove the entry at specified index from OrderedDictionary

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