Adapter — Design Patterns (GoF + Enterprise) in C#

6. Adapter

Intermediate★ Must knowLesson 6 of 18

Convert one interface into another that clients expect — wrap a legacy or third-party API.

csharp

public interface ISmsSender { Task SendAsync(string phone, string text); }   // our interface

public class TwilioSmsAdapter(TwilioRestClient client, string from) : ISmsSender      // adapts the SDK
{
    public Task SendAsync(string phone, string text) =>
        MessageResource.CreateAsync(to: new PhoneNumber(phone), from: new PhoneNumber(from), body: text, client: client);
}

Benefits: the vendor SDK is isolated in one class, so switching providers or mocking in tests is easy.