.NET Core 中的泛型 ActionResule<T> 不考虑类型 T

问：

在下面的示例中，方法的返回类型为GET

ActionResult<SomeAltResult>

但是 return 语句返回 of 并且它仍然编译成功。OKResultIEnumerableWeatherForecast

我无法理解如果我可以返回任何东西，那么拥有泛型有什么意义，我可以使用或.ActionResult<T>ActionResultIActionResult

另外，请帮助我理解不继承任何类或接口链，那么多态性在这里是如何工作的？ActionResult<T>OkObjectResult

namespace WebApplication1.Controllers
{
    [ApiController]
    [Route("[controller]")]
    public class WeatherForecastController : ControllerBase
    {
        private static readonly string[] Summaries = new[]{
        "Freezing", "Bracing", "Chilly", "Cool", "Mild", "Warm","Balmy", "Hot", "Sweltering", "Scorching"
    };
    
    [HttpGet(Name = "GetWeatherForecast")]
    public ActionResult<SomeAltResult> Get()
    {
        var x = Enumerable.Range(1, 5).Select(index => new WeatherForecast
            {
                Date = DateTime.Now.AddDays(index),
                TemperatureC = Random.Shared.Next(-20, 55),
                Summary = Summaries[Random.Shared.Next(Summaries.Length)]
            })
            .ToArray();
    
        return Ok(x);
    }
}

public class SomeAltResult
{
    public string Name { get; set; }
}