如何通过Asp.Net Core中间件的JsonResult做出响应?

问题描述：

我想通过一个Asp.Net Core中间件通过JsonResult进行响应，但如何实现这一点尚不清楚.我在很多地方用Google搜索，但收效甚微.我可以通过将ActionExecutedContext.Result设置为JsonResult从全局IActionFilter通过JsonResult进行响应，这很酷.但是在这种情况下，我想从中间件有效地返回JsonResult.怎么能做到?

I would like to respond via a JsonResult from a piece of Asp.Net Core middleware but it's not obvious how to accomplish that. I have googled around alot but with little success. I can respond via a JsonResult from a global IActionFilter by setting the ActionExecutedContext.Result to the JsonResult and that's cool. But in this case I want to effectively return a JsonResult from my middleware. How can that be accomplished?

我对有关JsonResult IActionResult的问题进行了框架化，但理想情况下，该解决方案适用于使用任何IActionResult编写来自中间件的响应.

I framed the question with regard to the JsonResult IActionResult but ideally the solution would work for using any IActionResult to write the response from the middleware.

答

中间件是ASP.NET Core的真正底层组件.在MVC存储库中实现了有效写出JSON的功能.具体来说，在 JSON格式器组件中

Middleware is a really low-level component of ASP.NET Core. Writing out JSON (efficiently) is implemented in the MVC repository. Specifically, in the JSON formatters component.

基本上可以归结为在响应流上编写JSON.以最简单的形式，它可以在这样的中间件中实现:

It basically boils down to writing JSON on the response stream. In its simplest form, it can be implemented in middleware like this:

using Microsoft.AspNetCore.Http;
using Newtonsoft.Json;

// ...

public async Task Invoke(HttpContext context)
{
    var result = new SomeResultObject();
    var json = JsonConvert.SerializeObject(result);
    await context.Response.WriteAsync(json);
}

如何通过Asp.Net Core中间件的JsonResult做出响应?

相关推荐