Dotnet Core API - 获取控制器方法的 URL

问题描述

我正在开发一个 API，它有两个控制器:PicturesController 和 AccountController.PicturesController 上有一个返回图像的方法，我想知道如何获取它的 URL.

I'm developing an API and it has two Controllers: PicturesController and AccountController. There's a method on PicturesController that returns an image and I'd like to know how to get its URL.

在另一个 PicturesController 方法中，我使用下面的代码获得了 URL:

On another PicturesController method, I got the URL using the code bellow:

var url = Url.RouteUrl("GetPicture", new { id = picture.Id }, Request.Scheme);

但是我需要从另一个控制器 (AccountController) 获取相同方法的 URL.

But I need to get the URL of the same method, however from another controller (AccountController).

我尝试了以下代码，但结果为空.

I tried the following code, but it results null.

var url = Url.Action("GetPicture", "PicturesController", new { id = picture.Id }, Request.Scheme);

就是这个方法:

public class PicturesController : Controller
{
  ...

   // GET api/pictures/id
    [HttpGet("{id}", Name = "GetPicture")]
    public async Task<ActionResult> Get(Guid id)
    {
        var picture = await _context.Pictures.FirstOrDefaultAsync(p => p.IsActive() && p.Id == id);

        if (picture == null)
            return NotFound();

        return File(picture.PictureImage, "image/jpg");
    }
  ...
}

推荐答案

问题是你在这段代码中使用了GetPicture:

The problem is that you are using GetPicture in this code:

var url = Url.Action("GetPicture", "PicturesController", new { id = picture.Id }, Request.Scheme);

Url.Action 是 action 的名称，在你的例子中是 Get，所以它应该

The first parameter for Url.Action is the name of the action, which in your case is Get, so it should be

var url = Url.Action("Get", "PicturesController", new { id = picture.Id }, Request.Scheme);

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