Efficiently Retrieve a Linked List from SQL Server Table Using Entity Framework

Published: 11 September 2025
on channel: vlogize

Learn how to convert SQL Server table records into a `Linked List` structure using Entity Framework, enhancing your data handling techniques with C# .
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This video is based on the question https://stackoverflow.com/q/62320174/ asked by the user 'Sami Ullah' ( https://stackoverflow.com/u/11525439/ ) and on the answer https://stackoverflow.com/a/62320691/ provided by the user 'Marc Gravell' ( https://stackoverflow.com/u/23354/ ) at 'Stack Overflow' website. Thanks to these great users and Stackexchange community for their contributions.

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Retrieving a Linked List from a SQL Server Table Using Entity Framework

When working with data in SQL Server, particularly in scenarios where you have hierarchical or sequential relationships, you may need to represent that data in a structured way. One typical representation of such relationships is through a Linked List. This guide will guide you through the process of retrieving a link list from a SQL Server table using Entity Framework, breaking down everything step-by-step so you can follow along easily.

The SQL Server Table Structure

Let's start with the scenario of the SQL Server table structure, which looks as follows:

[[See Video to Reveal this Text or Code Snippet]]

In this example, each record is associated with a nextID, indicating the ID of the next node in the list. Note that the last node (ID 4) has a nextID of null, signifying that it's the end of the list.

The Problem: Retrieving the Data

The goal here is to extract the data from this table and represent it in the form of a Linked List. You want the output structure to look something like this:

[[See Video to Reveal this Text or Code Snippet]]

This representation makes it clear how each node is linked to the next and helps you visualize the chain of data.

The Solution: Steps to Implement the Linked List Retrieval

Step 1: Fetch the Relevant Rows

To start, you'll need to retrieve the records from your SQL Server table. Typically, you may consider using Entity Framework to do this. However, due to the sequential nature of the linked list, the fetching must be handled with care.

Step 2: Create the Linked List Structure

Once you've fetched the relevant rows, will need to form the linked list manually in your C# code. Here’s a simple breakdown of how you can do that:

Define a Node Class:
You will need a class to define the structure of each node.

[[See Video to Reveal this Text or Code Snippet]]

Fetch and Assemble Nodes:
After creating the node class, you can fetch the records and assemble each node in a recursive manner or in a loop.

Use a loop to keep track of the current node and build the linked list until you reach a node with a null NextId.

Example code might look something like this:

[[See Video to Reveal this Text or Code Snippet]]

Step 3: Consider SQL Alternatives

In complex scenarios, consider using a recursive CTE (Common Table Expression) or a SQL WHILE loop to handle the relationship directly in SQL. This can pull all records in a single query. However, if your structure is simple where each node has only one child, the approach of building the structure in C# as shown above is sufficiently efficient.

Step 4: Evaluate Hierarchical Data Considerations

In cases where your data relationships become more complex, think about using hierarchyid data types in SQL Server, which can simplify the querying of hierarchical data structures like linked lists or trees in one go.

Conclusion

Retrieving and structuring a Linked List from a SQL Server table using Entity Framework can be a manual but straightforward process. With the right structure and approach, you can efficiently navigate your data's hierarchy, creating meaningful representations that enhance readability and usability.

By following these steps, you should be able to implement your own solution and fully grasp how to manage linked representations of data in C# . Happy coding!

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