Design Pattern Application example of single piece pattern application, and simple injection realization form

The last time I wrote a system architecture based on MVC pattern and command mode, I also made a simple example.

After writing what I want to write, I want to use a specific project to concatenate most of the design pattern ideas.

What I want to say today is the single piece mode.

First of all, a simple description of what is a single piece mode, also known as Singleton mode, to achieve a single instance of the function, not specifically said, do not understand the other introduction of conceptual articles.

Usually, in the project I have done, the most application singleton is to do the adapter, below I will explain how to do the adapter.

First, we introduce the application process of implementing a single instance of the adapter through a single piece mode.

Before I introduce the single piece mode, I want to introduce the concept of service-oriented programming first. In my current design thinking process, I think that any one of the business logic is based on service.

Services are coupled through interfaces and implementations. The following is an example of a system that I developed earlier to describe how to do an adapter by abstracting the core idea.

First, make a solution.

Do a user class service interface

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;

using Model;

namespace IService
{
　　　 public interface IUserService
　　　 {
　　　　　　　 Users Load();

　　　　　　　 void Insert(User user);

　　　　　　　 void Update(User user);

　　　　　　　 void Delete(User user);
　　　 }
}