<ItemGroup>
 <DotNetCliToolReference Include="Microsoft.VisualStudio.Web.CodeGeneration.Tools" Version="1.0.0" />
 </ItemGroup>

   //获取当前项目所在目录
   var contentPath = _hostingEnv.ContentRootPath;

   //获取wwwroot所在目录
   var rootPath = _hostingEnv.WebRootPath;

{
 "name": "jeffcky",
 "age": 25
}

  [HttpPost]
  public async Task<IActionResult> Json()
  {
   var result = string.Empty;

   var filePath = _hostingEnv.ContentRootPath + Path.DirectorySeparatorChar + "Json"
    + Path.DirectorySeparatorChar + "Read.json";

   using (var streamReader = System.IO.File.OpenText(filePath))
   {
    result = await streamReader.ReadToEndAsync();
   }

   var json = new { name = string.Empty, age = 0 };

   var data = JsonConvert.DeserializeAnonymousType(result, json);

   return View();
  }

{
 "LogPath": "C:\\Jeffcky_StudyEFCore\\logs",
 "Logging": {
 "IncludeScopes": false,
 "LogLevel": {
  "Default": "Debug",
  "System": "Information",
  "Microsoft": "Information"
 }
 },
 "jb51": {
 "name": "Jeffcky"
 }
}

   services.AddSingleton<IConfigurationRoot>(Configuration);
   services.AddSingleton<IConfiguration>(Configuration);

  public Startup(IHostingEnvironment env)
  {

   var builder = new ConfigurationBuilder()
    .SetBasePath(env.ContentRootPath)
    .AddJsonFile("appsettings.json", optional: true, reloadOnChange: true)
    .AddJsonFile($"appsettings.{env.EnvironmentName}.json", optional: true)
    .AddJsonFile("read.json")
    .AddEnvironmentVariables();
   Configuration = builder.Build();
  }

{
 "jb51": {
 "Name": "jeffcky",
 "Age": 25
 }
}

 services.Configure<Person>(Configuration.GetSection("jb51"));

  private readonly Models.Person p;
  public ReadJsonController(IOptions<Models.Person> option)
  {
   p = option.Value;
  }

  [HttpPost]
  public IActionResult Json()
  {
   var age = p.Age;
   var name = p.Name;

   return View();
  }