Question

如何将JSON对象（从Web API返回）映射到View Model。 [我正在使用automapper将我的c＃业务对象映射到View Model。我正在寻找类似于将JSON映射到View Model的东西

我收到以下错误：＆＃34;无法将当前JSON对象反序列化为类型＆＃39; System.Collections.Generic.IEnumerable`1 [CLAW.BLL.MLAReports.Models.CMAReport]＆＃39;因为类型需要一个JSON数组＆＃34;。

这是我在Webapi中的控制器的签名。

namespace ReportsAPI.Controllers
{
    public class ReportsController : ApiController
    {
    [HttpPost]
    public CMAReportVM Reports([FromBody] StatsCriteria criteria)
    {
      var cmaReport = Service3.GetCMAReport(criteria.Masnums);
       //Create Map to enable mapping business object to View Model
                 Mapper.CreateMap<CMAReport, CMAReportVM>();
       // Maps model to VM model class 
                 var cmaVM = Mapper.Map<CMAReport, CMAReportVM>(cmaReport);
      reutn cmaVM; 
    }
}
}

这是客户端控制器的签名：

 namespace MASReports.Controllers
    {
        public ActionResult Reports(StatsCriteria criteria)
            {
             var client = new HttpClient();
             client.DefaultRequestHeaders.Accept.Add(new MediaTypeWithQualityHeaderValue("application/json"));
             var response = client.PostAsJsonAsync("http://localhost:52765/api/reports", criteria.Masnums.ToString()).Result;

// The below line I get error.
            var represlt= response.Content.ReadAsAsync<IEnumerable<CMAReportVM>>().Result;

             return View("CMAReportVM", represlt);
            }
    }


Here's the signature for the model :


    namespace MLAReports.Models
    {
        public class CMAReportVM:ReportsVM
        {
            public CMAReportVM()    {}
            public List<Cma_Item> CmaList { get; set; }
            public string TimeStampString { get; set; }
            public Dictionary<string, string> CriteriaNameValue { get; set; }
        }  
    }


    namespace CLAW.BLL.MLAReports.Models
    {
        public class Cma_Item : IStatsGridable<Cma_Fields>
        { 
            public Cma_Item()            {}

            #region Properties and Fields
            public string PropTypeName { get; set; }
            public string StatusName { get; set; }
            public string LowP { get; set; }
            public string LowXStLP { get; set; }
            public string HighP { get; set; }
            public decimal? AvgLPFnl { get; set; }
            public decimal? AvgSPFnl { get; set; }    
            #endregion

            #region IStatsGrid Properties


            public List<string> Headers
            {
                get
                { return _headers;     }
                set
                { _headers = value;    }
            }    
            private IEnumerable<Cma_Fields> _rowModels;
            public IEnumerable<Cma_Fields> RowModels
            {
                get
                {      return _rowModels;}
                set
                {     _rowModels = value;}
            }

            private List<string> _headers;
            private string _id;
            #endregion

        }
    }

    namespace CLAW.BLL.MLaReports.Models
    {
        public interface IStatsGridable<T>
        {
             List<string> Headers { get; set; }
             string Id { get; set; }
             IEnumerable<T> RowModels { get; set; }
        }
    }


    namespace CLAW.BLL.MLAReports.Models
    {
        public class Cma_Fields
        {

            public Cma_Fields()         {   }

            #region Properties and Fields
            public string Mlanum { get; set; }
            public string Address { get; set; }
            public string BR { get; set; }
            public string BA { get; set; }
            public string SF { get; set; }

            public string TRId
            {
                get
                { return _trid;     }
                set
                {_trid = value;     }
            }
          #endregion
        }
    }

InnerException：

{＆＃34;无法将当前JSON对象（例如{\＆＃34; name \＆＃34;：\＆＃34; value \＆＃34;}）反序列化为类型＆System;系统。 Collections.Generic.IEnumerable`1 [CLAW.BLL.MLAReports.Models.CMAReport]＆＃39;因为类型需要一个JSON数组（例如[1,2,3]）才能正确反序列化。\ r \ n要解决此错误，要么将JSON更改为JSON数组（例如[1,2,3]）或更改反序列化类型，以便它是一个普通的.NET类型（例如，不是像整数的基本类型，不是像数组或列表那样的集合类型），可以从JSON对象反序列化。 JsonObjectAttribute也可以添加到类型中以强制它从JSON对象反序列化。\ r \ n路由＆＃39; CmaList＆＃39;，第1行，第11位。＆＃34;}

Answer 1

您的报告控制器签名正在返回单个项目

public CMAReportVM Reports([FromBody] StatsCriteria criteria)

但你试图把它读作IEnumerable

var represlt= response.Content.ReadAsAsync<IEnumerable<CMAReportVM>>().Result;

将JSON对象绑定到ViewModel

1 个答案: