如何将对象列表发送到WebAPI C＃？

Question

我正在尝试以json-array格式将对象列表发送到webapi。 但是，在参数中它变为空。

现在，让我发布到目前为止已经尝试过的代码

[HttpPost]
        [Route("~/api/visitsave")]
        public IHttpActionResult Save(List<VisitDataModel> visitobj)
        {
            foreach (VisitDataModel visitobjs in visitobj) {
            VisitManager obj = new VisitManager(visitobjs);
            bool value = obj.Save();
        }
            return Ok();
        }

这是我要传递的json数组，但是在参数visitobj中不起作用。

它的接收为null。 由于我是webapi和c＃的新手，因此我为此感到困惑。
但是当我传递单个json对象时，我正在获取值，当我切换回列表时，它不起作用。

让我发布要发布的json数组：

{"visitobj":[{"Remarks":"test","UserID":193,"FindingsAtSite":"nothing","CheckInDate":"2017-02-01 12:00:00","CheckOutDate":"2017-02-01 12:00:00","VisitStatusID":1,"CreatedBy":192,"CreatedDateTime":"2017-02-01 12:00:00","Claim":{"TransportMode":1,"Date":"2017-02-01 12:00:00","FromLocation":"chennai","ToLocation":"re","Ticket":123.2,"Conveyance":123.5,"Lodge":234.0,"Meals":23}}]}

这是jsonresponse尝试发送给我的webapi的人，可以有人帮助我解决这个问题，但这个问题很棘手。 提前致谢！！

Answer 1

这是正常现象，因为您的合同不匹配。

将您的参数更改为以下内容，您的参数就可以了

public class Claim
{
    public int TransportMode { get; set; }
    public string Date { get; set; }
    public string FromLocation { get; set; }
    public string ToLocation { get; set; }
    public double Ticket { get; set; }
    public double Conveyance { get; set; }
    public double Lodge { get; set; }
    public int Meals { get; set; }
}

public class Visitobj
{
    public string Remarks { get; set; }
    public int UserID { get; set; }
    public string FindingsAtSite { get; set; }
    public string CheckInDate { get; set; }
    public string CheckOutDate { get; set; }
    public int VisitStatusID { get; set; }
    public int CreatedBy { get; set; }
    public string CreatedDateTime { get; set; }
    public Claim Claim { get; set; }
}

public class VisiteRequest
{
     public List<Visitobj> visitobj { get; set; }
}

或第二个选项，您必须将Json发送的对象更改为数组

[{"Remarks":"test","UserID":193,"FindingsAtSite":"nothing","CheckInDate":"2017-02-01 12:00:00","CheckOutDate":"2017-02-01 12:00:00","VisitStatusID":1,"CreatedBy":192,"CreatedDateTime":"2017-02-01 12:00:00","Claim":{"TransportMode":1,"Date":"2017-02-01 12:00:00","FromLocation":"chennai","ToLocation":"re","Ticket":123.2,"Conveyance":123.5,"Lodge":234.0,"Meals":23}}]

Answer 2

可能是您以错误的格式传递了json。 我有这样的API动作

[HttpPost]
[Route("sample")]
public IHttpActionResult SampleOp(List<SampleObj> smpJson)
{
      foreach (var item in smpJson){
          //Do Some Thing Here 
      }
      return ok();
}

并将json数据作为

[{
    "name":"name 1",
    "address":"address 1",
    "age":1
}, 
{
    "name":"name 2",
    "address":"address 2",
    "age":2
}]

这是我的SampleObj模态

public class SampleObj {
        public string name { get; set; }
        public string address { get; set; }
        public int age { get; set; }
    }

经过测试并在这里工作