列表中的asp.net Web API列表傳遞到json ajax

Question

我有Web api控制器，在其中嘗試執行以下操作：

public IHttpActionResult Get()
{

    var Rooms = db.Rooms.Select(r => new {
        Id = r.Id,
        Name = r.Name,
        ChairNum = r.СhairNum,
        Requests = r.Requests.ToList()
    }).ToList();

   return Ok(new { results = Rooms });

}

在模型中，我有這個：

public partial class Room
{
    [System.Diagnostics.CodeAnalysis.SuppressMessage("Microsoft.Usage", "CA2214:DoNotCallOverridableMethodsInConstructors")]
    public Room()
    {
        this.Requests = new HashSet<Request>();
    }

    public int Id { get; set; }
    public string Name { get; set; }
    public int СhairNum { get; set; }
    public bool IsProjector { get; set; }
    public bool IsBoard { get; set; }
    public string Description { get; set; }

    [System.Diagnostics.CodeAnalysis.SuppressMessage("Microsoft.Usage", "CA2227:CollectionPropertiesShouldBeReadOnly")]
    public virtual ICollection<Request> Requests { get; set; }
}

我試圖在服務中傳遞此數據。 但是我調用http：// localhost：99999 / api / Rest時出現序列化錯誤。

<ExceptionMessage>
The "ObjectContent`1" type could not serialize the response text for the content type "application / json; charset = utf-8".
</ ExceptionMessage>

將模型中的數據傳遞到json的最佳方法是什么？

Answer 1

它有助於放入WebApiConfig：

  var json = config.Formatters.JsonFormatter;
    json.SerializerSettings.PreserveReferencesHandling = Newtonsoft.Json.PreserveReferencesHandling.Objects;
    config.Formatters.Remove(config.Formatters.XmlFormatter);