public class PermissionCheckApplicationModelConvention : IApplicationModelConvention
{
 public void Apply(ApplicationModel application)
 {
  foreach (var controllerModel in application.Controllers)
  {
   var controllerType = controllerModel.ControllerType;
   var controllerName = controllerModel.ControllerName;

   controllerModel.Actions.ToList().ForEach(actionModel =>
   {
    var actionName = actionModel.ActionName;
    var parameters = actionModel.Parameters;

    // 根据判断条件，操作修改actionModel
   });

   // 根据判断条件，操作修改ControllerModel
  }
 }
}

services.AddMvc().Configure<MvcOptions>(options =>
{
 options.ViewEngines.Clear();
 options.ViewEngines.Add(typeof(ThemeViewEngine));
});

JsonInputFormatter
XmlDataContractSerializerInputFormatter

HttpNoContentOutputFormatter
StringOutputFormatter
JsonOutputFormatter
XmlDataContractSerializerOutputFormatter

public Task DoSomethingAsync()
{
 // 返回Task
}

public void DoSomething()
{
 // Void方法
}

public string GetString()
{
 return null; // 返回null
}

public List<Data> GetData()
{
 return null; // 返回null
}

public object GetData()
{
 return"The Data"; // 返回JSON
}

public string GetString()
{
 return"The Data"; // 返回字符串
}

services.Configure<MvcOptions>(options =>
 options.OutputFormatters.RemoveAll(formatter => formatter.Instance is JsonOutputFormatter)
);

public class Product2Controller : Controller
{
 [Produces("application/json")]
 //[Produces("application/xml")]
 public Product Detail(int id)
 {
  return new Product() { ProductId = id, ProductName = "商品名称" };
 }
}

[Produces("application/json")]
public class JsonController : Controller { }

public class HomeController : JsonController
{
 public List<Data> GetMeData()
 {
  return GetDataFromSource();
 }
}

services.Configure<MvcOptions>(options =>
 options.Filters.Add(newProducesAttribute("application/json"))
);

[ResponseCache(Duration = 100)]
public IActionResult Index()
{
 return Content(DateTime.Now.ToString());
}

[ResponseCache(CacheProfileName = "MyProfile")]
public IActionResult Index()
{
 return Content(DateTime.Now.ToString());
}

public void ConfigureServices(IServiceCollection services)
{
 services.Configure<MvcOptions>(options =>
 {
  options.CacheProfiles.Add("MyProfile",
   new CacheProfile
   {
    Duration = 100
   });
 });
}