System.Linq.OrderedEnumerable.d__2

.NET > API Reference > System > System.Linq > OrderedEnumerable.d__2

Class OrderedEnumerable<TElement>.d__2<TKey>

Summary

Represents the enumerator for an ordered sequence, capable of yielding elements based on a key selector and an optional comparer. This internal class is part of the implementation details of the LINQ OrderBy and OrderByDescending methods.

Remarks

This class is an internal implementation detail of the .NET LINQ library. It is not intended for direct use by your code. Its primary purpose is to manage the state and iteration logic for sequences that have been sorted.

The `d__2` naming convention often indicates a compiler-generated state machine for an iterator, used to efficiently implement methods that return IEnumerable<T> or IEnumerator<T>.

Key aspects managed by this class include:

Storing the original source sequence.
Applying the key selector function to extract keys for comparison.
Using the specified comparer for ordering.
Managing the state of the enumeration to ensure correct ordering and element retrieval.

Inheritance

System.Object

System.Linq.OrderedEnumerable<TElement>.d__2<TKey>

Implementations

System.Collections.Generic.IEnumerator<TElement>

System.IDisposable

Fields

This class typically contains internal fields for managing its state, such as references to the source enumerator, the key selector, the comparer, and the current element.

Methods

Name	Description
`MoveNext()`	Advances the enumerator to the next element of the collection. This method is crucial for iterating through the sorted sequence.
`Dispose()`	Performs application-defined tasks associated with freeing, releasing, or resetting unmanaged resources.

Properties

Name	Description
`Current`	Gets the current element in the collection. This property returns the next element in the ordered sequence.

Example Usage

As this is an internal class, direct usage is not recommended or typically possible in application code. It is used internally by LINQ methods like OrderBy.

                
// This is an internal implementation detail and not directly callable.
// The following is a conceptual illustration of how it's used internally:

var numbers = new List<int> { 3, 1, 4, 1, 5, 9, 2, 6 };

// Internally, OrderBy likely uses a state machine similar to OrderedEnumerable.d__2
var orderedNumbers = numbers.OrderBy(n => n);

// The iteration over orderedNumbers would implicitly use the functionality
// provided by the OrderedEnumerable.d__2 class.
foreach (var number in orderedNumbers)
{
    Console.WriteLine(number);
}
                
            