索引.html不显示为默认页面

我在 .NET Core 中创建了一个空的 Web 应用程序，wwwroot我有索引.html它不会作为默认页面加载，它仅在我显式调用它时才加载。

这是我的项目.json

{
  "version": "1.0.0-*",
  "compilationOptions": {
    "emitEntryPoint": true
  },
  "dependencies": {
    "Microsoft.AspNet.Server.Kestrel": "1.0.0-rc1-final",
    "Microsoft.AspNet.StaticFiles": "1.0.0-rc1-final"
  },
  "commands": {
    "web": "Microsoft.AspNet.Server.Kestrel"
  },
  "frameworks": {
    "dnxcore50": { }
  },
  "exclude": [
    "wwwroot",
    "node_modules"
  ],
  "publishExclude": [
    "**.user",
    "**.vspscc"
  ]
}

这是我的创业公司：

public class Startup
{
    // This method gets called by the runtime. Use this method to add services to the container.
    // For more information on how to configure your application, visit http://go.microsoft.com/fwlink/?LinkID=398940
    public void ConfigureServices(IServiceCollection services)
    {
    }
    // This method gets called by the runtime. Use this method to configure the HTTP request pipeline.
    public void Configure(IApplicationBuilder app)
    {
        app.UseStaticFiles();
    }
    // Entry point for the application.
    public static void Main(string[] args) => WebApplication.Run<Startup>(args);
}

app.UseDefaultFiles();