c# - Web API 发布反序列化 json 结果但所有属性为空

Question

几天来我一直在为这个问题绞尽脑汁。

使用 Angular $http 服务，我将回传到一个传递 Movie json 对象的 api Controller 。当正确的 Action 被命中时，所有的模型属性，原始的和复杂的，都是空的或默认的。我使用了 JsonProperty 属性，因为 json 对象属性的名称与我需要反序列化到的 c# 模型的名称不同。我也尝试过使用 DataContract，确保在应用程序启动时将 UseDataContractJsonSerializer 设置为 true，但这也没有效果。

我还应该注意，我使用的是 web api 2.2。

简化模型:

public class Movie {

    [DatabaseGenerated(DatabaseGeneratedOption.None)]
    [JsonProperty(PropertyName = "id")]
    public int Id { get; set; }

    [JsonProperty(PropertyName = "title")]
    public string Title { get; set; }

    [JsonProperty(PropertyName = "year")]
    public int Year { get; set; }

    [JsonProperty(PropertyName = "release_dates")]
    public ReleaseDates ReleaseDates { get; set; }

    [JsonProperty(PropertyName = "ratings")]
    public Ratings Ratings { get; set; }

    [JsonProperty(PropertyName = "abridged_cast")]
    public ICollection<Character> Cast { get; set; }

    [JsonProperty(PropertyName = "users")]
    public ICollection<User> Users { get; set; }
}

行动:

public async Task<HttpResponseMessage> Post(Movie movie) {
    // do stuff
}

来自客户端的调用(在调试中我可以看到电影 js 对象与正确的数据混合):

$http.post('/api/usermovies', { movie : movie });

这是从角度发送的请求中的内容:

{
    "movie" : {
        "id" : "12897",
        "title" : "The Matrix",
        "year" : 1999,
        "release_dates" : {
            "theater" : "1999-03-31",
            "dvd" : "1999-09-21"
        },
        "ratings" : {
            "critics_rating" : "Certified Fresh",
            "critics_score" : 87,
            "audience_rating" : "Upright",
            "audience_score" : 85
        },
        "abridged_cast" : [{
                "name" : "Keanu Reeves",
                "id" : "162654049",
                "characters" : ["Neo"]
            }, {
                "name" : "Laurence Fishburne",
                "id" : "162669090",
                "characters" : ["Morpheus"]
            }, {
                "name" : "Carrie-Anne Moss",
                "id" : "162669130",
                "characters" : ["Trinity"]
            }, {
                "name" : "Hugo Weaving",
                "id" : "162709905",
                "characters" : ["Agent Smith"]
            }, {
                "name" : "Gloria Foster",
                "id" : "364627698",
                "characters" : ["The Oracle"]
            }
        ],
        "$$hashKey" : "00C"
    }
}

追踪并没有真正发现任何东西。 modelBinder 似乎正确地将 json 与正确的模型相关联......

w3wp.exe Information: 0 : Request, Method=POST, Url=http://www.moovy.com/api/usermovies, Message='http://www.moovy.com/api/usermovies'

w3wp.exe Information: 0 : Message='UserMovies', Operation=DefaultHttpControllerSelector.SelectController

w3wp.exe Information: 0 : Message='Moovy.Api.Controllers.UserMoviesController', Operation=DefaultHttpControllerActivator.Create

w3wp.exe Information: 0 : Message='Moovy.Api.Controllers.UserMoviesController', Operation=HttpControllerDescriptor.CreateController

w3wp.exe Information: 0 : Message='Selected action 'Post(Movie movie)'', Operation=ApiControllerActionSelector.SelectAction

w3wp.exe Information: 0 : Message='Value read='Moovy.Models.Movie'', Operation=JsonMediaTypeFormatter.ReadFromStreamAsync

w3wp.exe Information: 0 : Message='Parameter 'movie' bound to the value 'Moovy.Models.Movie'', Operation=FormatterParameterBinding.ExecuteBindingAsync

w3wp.exe Information: 0 : Message='Model state is valid. Values: movie=Moovy.Models.Movie', Operation=HttpActionBinding.ExecuteBindingAsync

怎么办，怎么办？

Answer 1

我想通了。这是因为我在请求中传递电影对象的方式有误。

这...

$http.post('/api/usermovies', { movie : movie });

应该改成这样...

$http.post('/api/usermovies', movie);

从具有不同属性名称的 json 对象到 Movie 对象的反序列化在该更改后工作正常。