如何在ASP.NET中执行前拦截api中的GET请求？

Question

我正在尝试弄清楚如何在 .NET Framework 中执行之前拦截 GET 调用。

我创建了 2 个应用程序：一个 front-end（调用 API 并用它发送自定义 HTTP headers）和一个 back-end API :

Front-end 方法调用 API:

[HttpGet]
    public async Task<ActionResult> getCall()
    {
        string url = "http://localhost:54857/";
        string customerApi = "2";

        using (var client = new HttpClient())
        {
            //get logged in userID
            HttpContext context = System.Web.HttpContext.Current;
            string sessionID = context.Session["userID"].ToString();

            //Create request and add headers
            client.BaseAddress = new Uri(url);
            client.DefaultRequestHeaders.Accept.Clear();
            client.DefaultRequestHeaders.Accept.Add(new MediaTypeWithQualityHeaderValue("application/json"));

            //Custom header
            client.DefaultRequestHeaders.Add("loggedInUser", sessionID);

            //Response
            HttpResponseMessage response = await client.GetAsync(customerApi);
            if (response.IsSuccessStatusCode)
            {
                string jsondata = await response.Content.ReadAsStringAsync();
                return Content(jsondata, "application/json");
            }
            return Json(1, JsonRequestBehavior.AllowGet);
        }
    }

Back-end 收到请求：

public class RedirectController : ApiController
{
    //Retrieve entire DB
    ConcurrentDBEntities dbProducts = new ConcurrentDBEntities();

    //Get all data by customerID
    [System.Web.Http.AcceptVerbs("GET")]
    [System.Web.Http.HttpGet]
    [System.Web.Http.Route("{id}")]
    public Customer getById(int id = -1)
    {
        //Headers uitlezen
        /*var re = Request;
        var headers = re.Headers;

        if (headers.Contains("loggedInUser"))
        {
            string token = headers.GetValues("loggedInUser").First();
        }*/

        Customer t = dbProducts.Customers
            .Where(h => h.customerID == id)
            .FirstOrDefault();
        return t;
    }
}

路由：

public static void RegisterRoutes(RouteCollection routes)
    {
        routes.IgnoreRoute("{resource}.axd/{*pathInfo}");

        routes.MapRoute(
            name: "Default",
            url: "{action}/{id}",
            defaults: new { controller = "Home", action = "Index", id = UrlParameter.Optional }
        );
    }

上面显示的代码工作正常，我得到了我的 API 调用的正确结果，但我正在寻找一种方法来拦截 所有传入的 GET 请求 在我返回响应之前，这样我就可以修改逻辑并将其添加到该控制器。在发出我的 GET 请求时，我添加了自定义 headers，我正在寻找一种在执行发生之前从传入的 GET 中提取这些内容的方法。

希望有人能帮忙！

提前致谢

Answer 1

ActionFilterAttribute，如以下示例所示，我创建了属性并将其放在 api 基础 class 上，其中所有 api class es inherit from，在到达api方法之前进入OnActionExecuting。我们可以在那里检查 RequestMethod 是否属于 "GET" 并执行您打算在那里执行的任何操作。

public class TestActionFilterAttribute: ActionFilterAttribute
{
    public override void OnActionExecuting(HttpActionContext actionContext)
    {
        if (actionContext.Request.Method.Method == "GET")
        {
            //do stuff for all get requests
        }
        base.OnActionExecuting(actionContext);
    }
}

[TestActionFilter] // this will be for EVERY inheriting api controller 
public class BaseApiController : ApiController
{

}

[TestActionFilter] // this will be for EVERY api method
public class PersonController: BaseApiController
{
    [HttpGet]
    [TestActionFilter] // this will be for just this one method
    public HttpResponseMessage GetAll()
    {
        //normal api stuff
    }
}

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