c# - 如何在asp.net mvc 中为属性路由添加默认参数

Question

我正在尝试更改此基于约定的路由:

routes.MapRoute(
    "MovieByReleaseDate",
    "movies/released/{year}/{month}",
    new { controller = "Movies", action = "ByReleasedDate" },
);

属性路由:

[Route("movies/released/{year}/{month}")]

但我看不出如何像第一种方式那样定义默认参数。

Answer 1

您可以使用多个 [Route] 属性和可为 null 的参数来实现您的目标。

[HttpGet]
[Route("movies/released/")]
[Route("movies/released/{year}")]
[Route("movies/released/{year}/{month}")]
public string Test(int? year = 2018, int? month = 1)
{
    return "The year is " + year;
}

当您向 movies/released 发送没有年份的请求时，年份将使用默认值。当您向 movies/released/2000 发送请求时，URL 参数会覆盖默认值。