How does Asp.net core api http request find the corresponding method and parameter mapping?

In ASP.NET Core, HTTP requests find the corresponding method through the routing system and map the request parameters to the method parameters. The specific process is as follows:

1. Routing system:
   The routing system in ASP.NET Core is responsible for processing incoming HTTP requests and deciding which handler to send the request to based on the path of the request and other conditions. The routing system uses routing templates (Route Template) to define routing rules, which are usually configured in Startup.csfile methods.Configure

2. Routing matching:
   When an HTTP request is received, the routing system will use the routing template for matching based on the requested path and other conditions. Route templates can contain static segments (such as /api/products) and dynamic segments (such as /api/products/{id}), and dynamic segments can match parameters in the URL.

3. Parameter mapping:
   When the routing system finds a route template that matches the request path, it determines which handler (usually the controller's action method) to send the request to. It then maps the requested parameters to the method's parameters based on the method's parameter list.

4. Parameter binding:
   Parameter mapping and parameter binding are responsible for the model binding system. Based on the type and name of the parameters, the model binding system attempts to extract the corresponding data from the request and bind it to the parameters of the method. Parameter binding can extract parameters from query strings, form data, routing data, etc.

5. Execution method:
   Once the routing system and model binding system successfully map and bind the parameters, the ASP.NET Core framework will execute the corresponding method and pass the parameters to the method. After the method is executed, the framework will convert the return value of the method into an HTTP response and return it to the client.

Summary:
ASP.NET Core maps HTTP requests to corresponding methods through the routing system, and uses the model binding system to bind request parameters to method parameters. This makes it easy to handle requests with different paths and parameters and execute corresponding method logic.