整个控制器类中都可以使用ASP.NET Core Route属性 [英] ASP.NET Core Route attributes available in entire controller class

问题描述

是否有一种方法可以使路由中指定的属性在整个类中可用?例如，考虑以下控制器:

Is there a way to make attributes specified in the route available in the whole class? For instance, consider this Controller:

[Route("api/store/{storeId}/[controller]")]
public class BookController
{
    [HttpGet("{id:int:min(1)}")]
    public async Task<IActionResult> GetBookById(int storeId, int id)
    {
    }
}

这个请求:

/api/store/4/book/1

在GetBookById方法内，storeId变量正确地填充了4，而id变量正确地填充了1.但是，不必在BookController的每个方法中都传递storeId变量，而是可以执行以下操作:

Inside the GetBookById method, the storeId variable is correctly populated with 4 and the id variable with 1. However, instead of having to pass the storeId variable in every method of the BookController, is there a way to do something like this:

[Route("api/store/{storeId}/[controller]")]
public class BookController
{
    private int storeId;

    [HttpGet("{id:int:min(1)}")]
    public async Task<IActionResult> GetBookById(int id)
    {
        //use value of storeId here
    }
}

推荐答案

如果控制器继承自Controller类，则可以覆盖OnActionExecuting方法，如果控制器继承自ControllerBase，则需要实现IActionFilter使其正常工作的界面

If the controller inherits from Controller class then you can override OnActionExecuting method, if the controller inherits from ControllerBase you need to implement IActionFilter interface to make it work

[Route("api/store/{storeId}/[controller]")]
public class BookController : ControllerBase, IActionFilter
{
    private int storeId;

    [HttpGet("{id:int:min(1)}")]
    public async Task<IActionResult> GetBookById(int id)
    {
        // use value of storeId here
    }

    public void OnActionExecuted(ActionExecutedContext context)
    {
        //empty
    }

    public void OnActionExecuting(ActionExecutingContext context)
    {
        string value = context.RouteData.Values["storeId"].ToString();
        int.TryParse(value, out storeId);
    }
}

或者在控制器属性上使用[FromRoute]属性对此有更好的解决方案(如在此处所述)

Or there is a better solution for this using [FromRoute] attribute on a controller property (as desribed here)

[Route("api/store/{storeId}/[controller]")]
public class BookController : ControllerBase
{
    [FromRoute(Name = "storeId")] 
    public int StoreId { get; set; }

    [HttpGet("{id:int:min(1)}")]
    public async Task<IActionResult> GetBookById(int id)
    {
        // use value of storeId here
    }       
}

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