.net core DI注入，构造函数含有动态参数

news/2024/5/19 23:06:43 标签: .netcore

使用.net core 开发的时候我们使用依赖注入来实例化需要的服务等，有时候这个服务类的构造函数是有参数的，此时想使用依赖注入就变得很麻烦。我们可以采用工厂模式，去构造demo如下

person类

namespace DIDynamicConstructorParams.TestDI
{
    public class Person
    {
        public string Name { get; set; }

        public int Age { get; set; }

        private ILogger<Person> _loggerFactory;

        public Person(string name,int age, ILogger<Person> loggerFactory)
        {
            Name = name;
            Age = age;
            _loggerFactory = loggerFactory;
        }

        public string SayHello()
        {
            _loggerFactory.LogInformation("just a test");
            return $"hello {Name},my age is {Age}";
        }
    }
}

构造person的接口

namespace DIDynamicConstructorParams.TestDI
{
    public interface DIPersonFactory
    {
        Person CreatePerson(string name,int age, ILogger<Person> logger);
    }
}

接口实现

namespace DIDynamicConstructorParams.TestDI
{
    public class DI : DIPersonFactory
    {
        public Person CreatePerson(string name, int age,ILogger<Person> logger)
        {
            return new Person(name, age,logger);
        }
    }
}

builder.Services.AddScoped<DIPersonFactory,DI>();

依赖注入生成person类

using DIDynamicConstructorParams.TestDI;
using Microsoft.AspNetCore.Mvc;

// For more information on enabling Web API for empty projects, visit https://go.microsoft.com/fwlink/?LinkID=397860

namespace DIDynamicConstructorParams.Controllers
{
    [Route("api/[controller]/[action]")]
    [ApiController]
    public class DIController : ControllerBase
    {

        private readonly DIPersonFactory _dIPersonFactory;

        private ILogger<Person> _loggerFactory;

        public DIController(DIPersonFactory dIPersonFactory, ILogger<Person> loggerFactory)
        {
            _dIPersonFactory = dIPersonFactory;
            _loggerFactory = loggerFactory;
        }

        [HttpGet]
        public string Test([FromQuery] string Name, [FromQuery] int Age)
        {
           Person person = _dIPersonFactory.CreatePerson(Name, Age,_loggerFactory);
            return person.SayHello();
        }
    }
}