摘要

在配制服务项目中增加一个Json配制读取类，继续继承IConfig接口。

是否可以简化服务注册？

正文

创建一个Json配置文件

{
  "SmtpServer": "smtp.163.com",
  "UserName": "admin",
  "Password": "123456"
}

在ConfigServices项目中添加一个JsonConfigProvider类

using Newtonsoft.Json;
using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;

namespace ConfigServices
{
    public class JsonConfigProvider : IConfig
    {
        private EmailConfig emailConfig;
        private string fileName = "";
        public JsonConfigProvider()
        {

        }

        public JsonConfigProvider(string fileName)
        {
            this.fileName = fileName;
            emailConfig = JsonConvert.DeserializeObject<EmailConfig>(File.ReadAllText(this.fileName));
        }
        public string Value(string key)
        {
            Type t = emailConfig.GetType();
            var p= t.GetProperty(key).GetValue(emailConfig, null);
            return p.ToString();
        }
    }
    public class EmailConfig
    {
        public string SmtpServer { get; set; } = "";
        public string UserName { get; set; } = "";
        public string Password { get; set; } = "";
    }
}

调用

internal class Program
{
    static void Main(string[] args)
    {
        ServiceCollection services=new ServiceCollection();
        services.AddScoped(typeof(IConfig), x => new JsonConfigProvider("config.json"));
        //services.AddScoped<ILog, LogProvider>();
        services.AddScoped<IEmail,EmailProvider>();
        services.AddLogScoped();//我们通过静态扩展可以做成这样
        using (var sp = services.BuildServiceProvider())
        {
            var provider = sp.GetRequiredService<IEmail>();
            provider.SendEmail("test", "body", "admin@admin.com");
        }
    }
}

其中LogServices中我们添加一个扩展类LogExtension

using LogServices;
using Microsoft.Extensions.DependencyInjection;
using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;

namespace Microsoft.Extensions.DependencyInjection
{
    public static class LogExtension
    {
        public static void AddLogScoped(this IServiceCollection serives)
        {
            serives.AddScoped<ILog,LogProvider>();
        }
    }
}

ConfigServices项目，同理可以添加一个静态方法

namespace Microsoft.Extensions.DependencyInjection
{
    public static class ConfigExtension
    {
        public static void AddConfigScope(this IServiceCollection serives,string fileName)
        {
            serives.AddScoped(typeof(IConfig),x=>new JsonConfigProvider(fileName));
        }
    }
}

调用时修改

//services.AddScoped(typeof(IConfig), x => new JsonConfigProvider("config.json"));
services.AddConfigScope("config.json");