Asp.net mvc 4 mvc4 web api中的嵌套类型，JSON来自AS3/FLEX，为空

解决了！检查柱子底部，寻找解决方案

因此，我有一个正在开发的web api，对于仅由基本类型组成的简单类型，Get和Post的工作都非常出色。一个有效的示例：

    public class Investigator
    {
        public int InvestigatorId { get; set; }
        public string Name { get; set; }
    }

但是，对于嵌套类型，嵌套对象返回为其默认表示形式0，并根据类型返回空值。下面是一个不起作用的示例：

public class Project
{
    public int ProjectId { get; set; }


    public string ProjectName { get; set; }
    public virtual State State { get; set; }
    public string City { get; set; }
    public virtual Investigator ProjectInvestigator { get; set; }

}

当我调用uri发布项目时，除了嵌套类型之外，所有字段都正常运行，它们以默认表示形式返回，Investor返回时id为0，name为null。如果我没有在post请求中包含调查员，调查员对象本身将作为null而不是默认对象。所以我知道它至少被代码看到了，但是它没有正确地反序列化或者其他什么。这可能是什么原因造成的？在反序列化之前，我可以在哪里查看传入的数据

其他可能相关的代码部分是控制器：

 public class ProjectsController : ApiController
{
    private NovascotiaContext db = new NovascotiaContext();

    protected override void Initialize(System.Web.Http.Controllers.HttpControllerContext controllerContext)
    {
        base.Initialize(controllerContext);
        db.Configuration.ProxyCreationEnabled = false;
    }

    // GET api/Projects
    public IEnumerable<Project> GetProjects()
    {
        return db.Projects.AsEnumerable();
    }

    // GET api/Projects/5
    public Project GetProject(int id)
    {
        Project project = db.Projects.Find(id);
        if (project == null)
        {
            throw new HttpResponseException(Request.CreateResponse(HttpStatusCode.NotFound));
        }

        return project;
    }

    // PUT api/Projects/5
    public HttpResponseMessage PutProject(int id, Project project)
    {
        if (!ModelState.IsValid)
        {
            return Request.CreateErrorResponse(HttpStatusCode.BadRequest, ModelState);
        }

        if (id != project.ProjectId)
        {
            return Request.CreateResponse(HttpStatusCode.BadRequest);
        }

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

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

        return Request.CreateResponse(HttpStatusCode.OK);
    }

    // POST api/Projects
    public HttpResponseMessage PostProject([FromBody]Project project)
    {
        if (ModelState.IsValid)
        {
            db.Projects.Add(project);
            db.SaveChanges();

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


    // DELETE api/Projects/5
    public HttpResponseMessage DeleteProject(int id)
    {
        Project project = db.Projects.Find(id);
        if (project == null)
        {
            return Request.CreateResponse(HttpStatusCode.NotFound);
        }

        db.Projects.Remove(project);

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

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

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

其中projectPostService是一个方法为POST的HTTPService对象。奇怪的是，在写这篇文章的时候，我创建了一个简单的页面来访问服务，结果很好，这显然是as3/flex和web api之间的通信。以下是有效的页面：

---

你能分享你的原始“帖子”请求吗？

public static class WebApiConfig
{
    public static void Register(HttpConfiguration config)
    {
        config.Routes.MapHttpRoute(
            name: "DefaultApi",
            routeTemplate: "api/{controller}/{id}",
            defaults: new { id = RouteParameter.Optional }
        );

        var appXmlType = config.Formatters.XmlFormatter.SupportedMediaTypes.FirstOrDefault(t => t.MediaType == "application/xml");
        config.Formatters.XmlFormatter.SupportedMediaTypes.Remove(appXmlType);

        // Uncomment the following line of code to enable query support for actions with an IQueryable or IQueryable<T> return type.
        // To avoid processing unexpected or malicious queries, use the validation settings on QueryableAttribute to validate incoming queries.
        // For more information, visit http://go.microsoft.com/fwlink/?LinkId=279712.
        //config.EnableQuerySupport();

        // To disable tracing in your application, please comment out or remove the following line of code
        // For more information, refer to: http://www.asp.net/web-api
        config.EnableSystemDiagnosticsTracing();
    }
}

var p:Project = new Project();
p.City = "ACity";
p.ProjectName = "AProjectName";
var state:data.State = new data.State();
state.StateId = 98;
state.StateName = "Tennessee";
p.State = state;
var investigator:Investigator = new Investigator();
investigator.InvestigatorId = 1;
investigator.Name = "John Doe";
p.ProjectInvestigator = investigator;
projectPostService.send(p);

<html xmlns="http://www.w3.org/1999/xhtml">
<head id="Head1" runat="server">
    <title></title>
    <script src="Scripts/jquery-1.8.2.js"></script>
    <script type="text/javascript">
        $(document).ready(function () {
            alert("ready");
                var project = {
                "ProjectId": 2,
                "ProjectName": "Aprojectname",
                "State": { "StateId": 98, "StateName": "Tennessee" },
                "ProjectInvestigator": { "InvestigatorId": 1, "Name": "John Doe" }
            };
            $.ajax({
                url: "http://localhost/api/Projects",
                type: 'POST',
                dataType: 'json',
                    data: project,
                success: function (data) {
                    alert(JSON.stringify(data));
                },
                failure: function (data) {
                    alert('fail');
                }
            });
        });
    </script>
</head>
<body>
    <form id="form1" runat="server">
    <div>

    </div>
    </form>
</body>
</html>

var p:Project = new Project();
p.City = "ACity";
p.ProjectName = "AProjectName";
var state:data.State = new data.State();
state.StateId = 98;
state.StateName = "Tennessee";
p.State = state;
var investigator:Investigator = new Investigator();
investigator.InvestigatorId = 1;
investigator.Name = "John Doe";
p.ProjectInvestigator = investigator;

var loader:URLLoader = new URLLoader();
var hdr:URLRequestHeader = new URLRequestHeader("Content-Type", "application/json");
var request:URLRequest = new URLRequest("http://localhost/api/Projects");
request.requestHeaders.push(hdr);
request.data = com.adobe.serialization.json.JSON.encode(p);
request.contentType = "TEXT";
request.method = "POST";
loader.addEventListener(Event.COMPLETE, function(e:Event):void{
    trace(loader.data); //return
});
loader.load(request);