问题是JSON对象无法转换为DataTable。除非你的数据/JSON是一个数组。
1.将jsonData读取为JObject。
1.将JObject示例添加到JArray中。
1.迭代JArray作为投影。
1.将JArray示例转换为DataTable。

using System.Linq;
using Newtonsoft.Json;
using Newtonsoft.Json.Linq;

JObject jObj = (JObject)JsonConvert.DeserializeObject(jsonData);
JArray jArray = new JArray();
jArray.Add(jObj);

jArray = JArray.FromObject(jArray.AsJEnumerable()
    .Select(x => new JObject 
            { 
                { "airFiberFeasibility", x["airFiberFeasibility"] }, 
                { "PMPFeasibility", x["PMPFeasibility"] }
                // Other properties to be displayed 
            })
    .ToList());

DataTable dt = jArray.ToObject<DataTable>();

由于您希望返回数据并将其显示在HTML表中，因此没有必要将其作为DataTable（这是一种旧技术）返回。将数据返回为JArray或List<T>会更容易。

using System.Linq;
using Newtonsoft.Json;
using Newtonsoft.Json.Linq;

JObject jObj = (JObject)JsonConvert.DeserializeObject(jsonData);
JArray jArray = new JArray();
jArray.Add(jObj);

jArray = JArray.FromObject(jArray.AsJEnumerable()
    .Select(x => new JObject 
            { 
                { "airFiberFeasibility", x["airFiberFeasibility"] }, 
                { "PMPFeasibility", x["PMPFeasibility"] } 
                // Other properties to be displayed
            })
    .ToList());

return jArray;

或

using System.Collections.Generic;
using Newtonsoft.Json;

ProjectionModel projection = JsonConvert.DeserializeObject<ProjectionModel>(jsonData);

List<ProjectionModel> list = new List<ProjectionModel> { projection };

return list;

public class ProjectionModel
{
    public string AirFiberFeasibility { get; set; }
    public string PMPFeasibility { get; set; }
    // Other properties
}