What kind of requirement can go for multiple instance creation?
Rajanikant Hawaldar
✅ Requirements That Call for Multiple Instances
Example:
class Customer{ public string Name { get; set; } public int Age { get; set; }}
✅ Use case: A shopping app where each Customer represents a different user.
class ReportGenerator{ public string GenerateReport(string data) => $”Report for {data}”;}
✅ Use case: Generating multiple reports at the same time with different data.
class Logger{ public void Log(string message) => Console.WriteLine(message);}
✅ Use case: A separate logger per thread for better log management and no race conditions.
class ShoppingCart{ public List Items = new List();}
✅ Use case: One shopping cart per user session in an e-commerce app.
class Printer{ public string PrinterName { get; } public Printer(string name) => PrinterName = name;}
✅ Use case: Managing multiple printers with different names or settings.
✅ Use case: In xUnit, each test creates its own object instance to test independently.
services.AddTransient(); // Creates new instance every time
✅ Use case: ASP.NET Core DI where services have different lifetimes.
❗When NOT to go for multiple instances?When the class holds global/shared state (e.g., ConfigurationManager, Logger).
If the object is expensive to create and can be reused safely (use singleton).
When only one instance should exist logically (like a DatabaseConnectionManager).
TL;DR – You Need Multiple Instances When:Each object represents a unique item or person
Each instance holds different data/state
You need thread isolation or short-lived usage
Independent behavior/config is required