学习笔记4: HATEOAS

动态类型实现HATEOAS

1.对于单个资源可以用ExpandoObject

2.对于集合资源使用匿名类.

实现:

1.新建一个类:LinkResource.cs,实现3个属性

    public class LinkResource
    {
        public LinkResource(string href, string rel, string method)
        {
            Href = href;
            Rel = rel;
            Method = method;
        }

        public string Href { get; set; }
        public string Rel { get; set; }
        public string Method { get; set; }
    }

2.在PostController.cs添加方法

private IEnumerable<LinkResource> CreateLinksForPost(int id, string fields = null)
        {
            var links = new List<LinkResource>();

            if (string.IsNullOrWhiteSpace(fields))
            {
                links.Add(
                    new LinkResource(
                        _urlHelper.Link("GetPost", new { id }), "self", "GET"));
            }
            else
            {
                links.Add(
                    new LinkResource(
                        _urlHelper.Link("GetPost", new { id, fields }), "self", "GET"));
            }

            links.Add(
                new LinkResource(
                    _urlHelper.Link("DeletePost", new { id }), "delete_post", "DELETE"));

            return links;
        }

        private IEnumerable<LinkResource> CreateLinksForPosts(PostParameters postResourceParameters,
            bool hasPrevious, bool hasNext)
        {
            var links = new List<LinkResource>
            {
                new LinkResource(
                    CreatePostUri(postResourceParameters, PaginationResourceUriType.CurrentPage),
                    "self", "GET")
            };

            if (hasPrevious)
            {
                links.Add(
                    new LinkResource(
                        CreatePostUri(postResourceParameters, PaginationResourceUriType.PreviousPage),
                        "previous_page", "GET"));
            }

            if (hasNext)
            {
                links.Add(
                    new LinkResource(
                        CreatePostUri(postResourceParameters, PaginationResourceUriType.NextPage),
                        "next_page", "GET"));
            }

            return links;
        }

 [HttpGet("{id}")]  修改为  [HttpGet("{id}",Name="GetPost")]