将数据传递到更进一步的中间件 [英] Pass data to middleware further down the chain

问题描述

当我将中间件注册为请求管道的一部分时，如何通过中间件链传递数据. (最终可通过MVC控制器操作访问)

When I register middleware as part of the request pipeline, how do I pass data through the middleware chain. (ultimately accessible in an MVC controller action)

例如，我已经实现了用于对请求进行身份验证的自定义中间件，但是如何将身份验证数据(例如，身份验证和其他数据的结果)传递到中间件链的下游-最终希望从MVC控制器操作，以及用于基于身份验证结果限制访问的自定义MVC操作过滤器.

For example, I have implemented custom middleware for authenticating my requests, but how can I pass the authentication data (such as the result of the authentication and additional data) down the chain of middleware - ultimately wanting to access the data from an MVC controller action, and also in a custom MVC action filter for restricting access based on the authentication results.

在每个地方都可以存储每个请求的自定义数据，然后在请求链中稍后访问它吗?

Is there anywhere I can store custom data on a per-request basis, and access it later in the request chain?

推荐答案

您可以使用HttpContext.Items集合存储请求生存期内的数据.它的主要用例是在组件(例如中间件和控制器)之间传递数据.添加和阅读项目很容易:

You can use the HttpContext.Items collection to store data for the lifetime of a request. Its primary use-case is passing data around components (middleware and controllers for example). Adding and reading items is easy:

写:

context.Items["AuthData"] = authData;

阅读:

var authData = (AuthData)context.Items["AuthData"];

请参见 ASP.NET文档有关更多信息.

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