Execution Order for the ApiController

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