aps.net cored 新概念

Tag Helpers

The EnvironmentTagHelper can be used to include different scripts in your views (for example, raw or minified) based on the runtime environment, such as Development, Staring, or Production:

 <environment names="Development">
     <script src="~/lib/jquery/dist/jquery.js"></script>
 </environment>
 <environment names="Staging,Production">
     <script src="https://ajax.aspnetcdn.com/ajax/jquery/jquery-2.1.4.min.js"
             asp-fallback-src="~/lib/jquery/dist/jquery.min.js"
             asp-fallback-test="window.jQuery">
     </script>
 </environment>

formating

 By default MVC includes a JsonInputFormatter class for handling JSON data, but you can add additional formatters for handling XML and other custom formats.可以添加其它的formatting.例如：

services.AddMvc()
       .AddXmlSerializerFormatters();或者

services.AddMvc(options =>
{
  options.OutputFormatters.Add(new XmlSerializerOutputFormatter());
});

Action可以返回一个对象，Controller actions can return POCOs (Plain Old CLR Objects), in which case ASP.NET MVC will automatically create an ObjectResult for you that wraps the object.

强制格式化返回数据：[Produces] filter

[Produces("application/json")]
public class AuthorsController

在url中定义数据格式：

 [FormatFilter]
 public class ProductsController
 {
   [Route("[controller]/[action]/{id}.{format?}")]
   public Product GetById(int id)

Response cache 

The primary HTTP header used for caching is Cache-Control. The HTTP 1.1 specification details many options for this directive. Three common directives are:

public

Indicates that the response may be cached.

private

        此种情况只能保存个人的缓存中，比如浏览器。

Indicates the response is intended for a single user and must not be cached by a shared cache. The response could still be cached in a private cache (for instance, by the user’s browser).

no-cache

Indicates the response must not be used by a cache to satisfy any subsequent request (without successful revalidation with the origin server).