Tutorials Design Patterns in C#
Options Pattern in ASP.NET Core — Complete Guide
Options Pattern in ASP.NET Core — Complete Guide: free step-by-step lesson with examples, common mistakes, and interview tips — part of Design Patterns in C# on Toolliyo Academy.
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Design Patterns in C# · Lesson 57 of 69
Options Pattern in ASP.NET Core
GoF Core ✓ → Enterprise ✓ → Cloud & Craft
Cloud & Craft · 3 — Microservices & interviews · ~10 min · Module 7: ASP.NET Core Architecture Patterns
What is this?
Options pattern binds configuration sections to strongly typed classes via IOptions/IOptionsMonitor.
Why should you care?
ShopNest payment settings should not be magic strings scattered in code.
See it live — copy this example
Paste into a C# console or class library project and run dotnet run.
public sealed class PaymentOptions
{
public const string Section = "Payment";
public string BaseUrl { get; set; } = "";
public int TimeoutMs { get; set; } = 3000;
}
// builder.Services.Configure<PaymentOptions>(builder.Configuration.GetSection(PaymentOptions.Section));
// ctor(IOptions<PaymentOptions> opt) => _opt = opt.Value;
Console.WriteLine("Payment:BaseUrl bound to PaymentOptions");Run Example »
Edit the code below and click Run to see the result in Toolliyo’s live editor.
What happened?
- Configure
binds JSON. - IOptionsMonitor supports hot reload.
- Validate options with DataAnnotations on startup.
Practice next
- Create PaymentOptions.
- Bind from appsettings.
- Inject IOptions
. - Use IOptionsMonitor for live reload.
- Named options for two PSPs.
Remember
Typed config. DI-friendly. Validate early.
ShopNest PaymentOptions
Timeout/BaseUrl from config section.
Outcome: Env-specific settings without code edits.
Interview prep for this lesson
Practice these questions aloud after reading—each links to a full structured answer.
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