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[]>();
}
}
}