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我正在尝试使用 Web api 服务更新专辑的值，但是当我使用 put 请求时，它会到达控制器（有时），创建上下文，但是然后找不到/运行我拥有的 PUT 方法.

我正在向 Web API 发送格式为 JSON 的类专辑（如下）。

public class Album
{
    [ScaffoldColumn(false)]
    public int Id { get; set; }

    [Required]
    public string Title { get; set; }

    public string Description { get; set; }

    [Required]
    public string Artist { get; set; }

    public string Genre { get; set; }

    [Required]
    public int Year { get; set; }

    [Display(Name="No. Tracks")]
    public int NumberOfTracks { get; set; }
}

这是应该接收所有内容的 WebAPI 控制器

public class AlbumsController : ApiController
{
    private AlbumsContext db = new AlbumsContext();

    // GET api/Albums

    public IQueryable<Album> Get()
    {
        return (from a in db.Albums select a);
    }

    public IQueryable<Album> Get(int skip, int page)
    {
        var ret = (from a in db.Albums select a);
        ret = ret.OrderBy(a => a.Title);
        ret = ret.Skip(skip);
        ret = ret.Take(page);
        return ret;
    }

    // GET api/Albums/5
    public Album Get(int id)
    {
        return db.Albums.FirstOrDefault(a => a.Id == id);
    }

    // PUT api/Albums
    [HttpPut]
    public HttpResponseMessage Put([FromBody]Album album)
    {
        if (!ModelState.IsValid)
        {
            return Request.CreateErrorResponse(HttpStatusCode.BadRequest, ModelState);
        }

        db.Entry(album).State = EntityState.Modified;

        try
        {
            db.SaveChanges();
        }
        catch (DbUpdateConcurrencyException ex)
        {
            return Request.CreateErrorResponse(HttpStatusCode.NotFound, ex);
        }

        return Request.CreateResponse(HttpStatusCode.OK);
    }

    // POST api/Albums
    public HttpResponseMessage Post(Album album)
    {
        if (ModelState.IsValid)
        {
            db.Albums.Add(album);
            db.SaveChanges();

            HttpResponseMessage response = Request.CreateResponse(HttpStatusCode.Created, album);
            response.Headers.Location = new Uri(Url.Link("DefaultApi", new { id = album.Id }));
            return response;
        }
        else
        {
            return Request.CreateErrorResponse(HttpStatusCode.BadRequest, ModelState);
        }
    }

    // DELETE api/Albums/5
    public HttpResponseMessage Delete(int id)
    {
        Album album = db.Albums.Find(id);
        if (album == null)
        {
            return Request.CreateResponse(HttpStatusCode.NotFound);
        }

        db.Albums.Remove(album);

        try
        {
            db.SaveChanges();
        }
        catch (DbUpdateConcurrencyException ex)
        {
            return Request.CreateErrorResponse(HttpStatusCode.NotFound, ex);
        }

        return Request.CreateResponse(HttpStatusCode.OK, album);
    }

    protected override void Dispose(bool disposing)
    {
        db.Dispose();
        base.Dispose(disposing);
    }
}

这是发出 PUT 请求的服务器控制器方法

[HttpPut]
public ActionResult Edit(Album album, HttpPostedFileBase Image1, HttpPostedFileBase Image2, HttpPostedFileBase Image3, int AlbumID, int RemoveID = 0)
{
    string AlbumApiUri = "http://localhost:58431/api/Albums";

    HttpRequestMessage request = new HttpRequestMessage();

    request.RequestUri = new Uri(AlbumApiUri);

    request.Method = HttpMethod.Put;

    MediaTypeFormatter jsonFormatter = new JsonMediaTypeFormatter();

    request.Content = new ObjectContent<Album>(album, jsonFormatter);

    request.Content.Headers.ContentType = System.Net.Http.Headers.MediaTypeHeaderValue.Parse("application/json");

    album.Id = AlbumID;

    HttpClient client = new HttpClient();

    var response = client.SendAsync(request).Result;

    if (response.IsSuccessStatusCode)
    {
        bool a = true;
    }
    else
    {
        bool b = true;
    }

    return RedirectToAction("Details", new { ID = AlbumID });
}
4

1 回答 1

2

事实证明我几乎是个白痴，这引发问题的主要原因是我没有将 Album 标记为 DataContract 并包含 DataMember 字段。希望这会教任何犯同样错误的人！

于 2013-04-18T13:29:50.597 回答