.Net Core 2.0 依赖注入（DI）——属性注入

步骤一：
Nuget导入配置包
ConfigurationBuilder："Microsoft.Extensions.Configuration"
AddJsonFile："Microsoft.Extensions.Configuration.Json"

步骤二：
创建Student实体类
public class Student
???{
???????public string Name { get; set; }

???????public string Age { get; set; }
???}
步骤三：
更改配置文件appsettings.json文件内容
{
?"Student": {
???"Name": "张三",
???"Age": "24"
?}
}
步骤四：
修改Program 主程序，重新设置UseConfiguration
public class Program
???{
??????
???????public static void Main(string[] args)
???????{ ??
???????????BuildWebHost(args).Run();
???????}

???????public static IWebHost BuildWebHost(string[] args) =>
???????????WebHost.CreateDefaultBuilder(args)
???????????.UseConfiguration(//此处增加
???????????????new ConfigurationBuilder()
???????????????.AddJsonFile("appsettings.json", optional: true, reloadOnChange: true)
???????????????.Build()
???????????????)
???????????????.UseStartup<Startup>()
???????????????.Build();
???}
步骤五：
修改Startup——> ConfigureServices 通过Configure注入属性
// This method gets called by the runtime. Use this method to add services to the container.
???????public void ConfigureServices(IServiceCollection services)
???????{
???????????
???????????services.AddOptions().Configure<Student>(Configuration.GetSection(nameof(Student)));
???????????services.AddMvc();
???????}
步骤六：
HomeController 中使用Student实体

IOptions<Student> _student;
???????public HomeController(IOptions<Student> student)
???????{
???????????_student = student;
???????}
???????public IActionResult Index()
???????{
???????????return View(_student.Value);
???????}