Build a Simple In-Memory Database with?

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Real World Need

In-memory data storage is useful when:

• High performance is required
• Offline data handling is needed
• Unit testing should not depend on a real database
• Temporary storage is required during processing

Concept

Store objects in memory and allow querying like a lightweight database.

Implementation

public class InMemoryDb<T>
{
private readonly List<T> _data = new List<T>();
public void Add(T item) => _data.Add(item);
public IEnumerable<T> Get(Func<T, bool> predicate)
=> _data.Where(predicate);
}

// Usage

var db = new InMemoryDb<Employee>();
db.Add(new Employee { Id = 1, Name = "Sandeep" });
var result = db.Get(e => e.Name.Contains("San"));

Key Concepts

• Generic in-memory storage
• Predicate-based querying
• Not thread-safe unless synchronization is added