Execution Order for the ApiController

Assuming the request goes into the ApiController scope, the operation order is as below:

  • The ExecuteAsync method of the ApiController is invoked.
  • The Initialize method of the ApiController is invoked.
  • The registered Action Selector is retrieved.
  • The SelectAction method of the registered action selector is invoked. If only one action method is matched, the pipeline continues.
  • All registered Filters for the selected action is retrieved.
  • The Authorization Filters are called. The authorization filter can decide either to let the pipeline to continue executing or to terminate the pipeline.
  • If Authorization Filters didn't terminate the request, action parameter bindings are performed.
  • ApiController.ModelState is set.
  • Action Filters are invoked. The Action Filters can decide either to let the pipeline to continue executing or terminate the pipeline.
  • If Action Filters didn't terminate the request, registered Action Invoker is retrieved.
  • The InvokeActionAsync method of the registered Action Invoker is called to invoked the selected action method.
  • Note: If any exception occurs from the execution of the Authorization Filters to the execution of the action method, the exception filters are be called.

There are a few more things which happen in between but this is very close to a complete view. Check out the ApiController source code for more information.

实际使用来看

2019-02-25 16:16:17.668+08:00 INFO [59]: CustomMessageHandler.SendAsync
2019-02-25 16:16:18.107+08:00 INFO [59]: BaseApiController.Initialize

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