利用ASP.netCore自带DI(DependencyInjection)实现批量依赖注入

ASP.net Core自带DI(依赖注入),用法如下:

services.AddScoped(typeof(IProductService), typeof(ProductService));

如果服务较多,必定造成文件难以维护 所以需要利用反射批量实现注册 核心代码如下:

一个类可能间接继承了多个接口(例如:public 和internal的接口),这里我们就以实现类为Key,所继承的接口为value构造一个集合

/// <summary>

/// 获取程序集中的实现类对应的多个接口

/// </summary>

/// <param name="assemblyName">程序集</param>

public Dictionary<Type, Type[]> GetClassName(string assemblyName)

{

if (!String.IsNullOrEmpty(assemblyName))

{

Assembly assembly = Assembly.Load(assemblyName);

List<Type> ts = assembly.GetTypes().ToList();

var result = new Dictionary<Type, Type[]>();

foreach (var item in ts.Where(s => !s.IsInterface))

{

var interfaceType = item.GetInterfaces();

result.Add(item, interfaceType);

}

return result;

}

return new Dictionary<Type, Type[]>();

}

注册:

我们现在可以把具体的注册例如

services.AddScoped(typeof(IProductService), typeof(ProductService));

改为:

//集中注册服务

foreach (var item in GetClassName("Service"))

{

foreach (var typeArray in item.Value)

{

services.AddScoped(typeArray, item.Key);

}

}  

完整代码:

using System;

using System.Collections.Generic;

using System.Linq;

using System.Threading.Tasks;

using Microsoft.AspNetCore.Builder;

using Microsoft.AspNetCore.Hosting;

using Microsoft.Extensions.Configuration;

using Microsoft.Extensions.DependencyInjection;

using Microsoft.Extensions.Logging;

using Microsoft.Extensions.Options;

using Microsoft.EntityFrameworkCore;

using Entity.Table; using DAL;

using System.Reflection;

using Service;

namespace ASP.NetCoreAPI

{

public class Startup

{

    public Startup(IConfiguration configuration)

    {
        Configuration = configuration;
    }
    public IConfiguration Configuration { get; }
    // This method gets called by the runtime. Use this method to add services to the container.
    public void ConfigureServices(IServiceCollection services)
    {
        services.AddDbContext<ProductContext>(options => options.UseMySql(Configuration.GetConnectionString("MySqlConnection")));
        //添加Mysql支持
        //集中注册服务
        foreach (var item in GetClassName("Service"))
        {
            foreach (var typeArray in item.Value)
            {
                services.AddScoped(typeArray, item.Key);
            }
        }
        services.AddUnitOfWork<ProductContext>();
        //添加UnitOfWork支持
        //services.AddScoped(typeof(IProductService), typeof(ProductService));
        //用ASP.NET Core自带依赖注入(DI)注入使用的类
        services.AddMvc();
    }
    // This method gets called by the runtime. Use this method to configure the HTTP request pipeline.
    public void Configure(IApplicationBuilder app, IHostingEnvironment env)
    {
        if (env.IsDevelopment())
        {
            app.UseDeveloperExceptionPage();
        }
        app.UseMvc();
    }
    /// <summary>
    /// 获取程序集中的实现类对应的多个接口
    /// ///
    /// </summary>
    /// /// <param name="assemblyName">程序集</param>
    public Dictionary<Type, Type[]> GetClassName(string assemblyName)
    {
        if (!String.IsNullOrEmpty(assemblyName))
        {
            Assembly assembly = Assembly.Load(assemblyName);
            List<Type> ts = assembly.GetTypes().ToList();
            var result = new Dictionary<Type, Type[]>();
            foreach (var item in ts.Where(s => !s.IsInterface))
            {
                var interfaceType = item.GetInterfaces();
                result.Add(item, interfaceType);
            }
            return result;
        }
        return new Dictionary<Type, Type[]>();
    }
}
}

.