这是json 还没有填数据的字符串

{
    "NeedUpDateFields": [],
    "NeedReturnFields": [],
    "IsDeleteEntry": "true",
    "SubSystemId": "",
    "IsVerifyBaseDataField": "false",
    "IsEntryBatchFill": "true",
    "ValidateFlag": "true",
    "NumberSearch": "true",
    "IsAutoAdjustField": "false",
    "InterationFlags": "",
    "IgnoreInterationFlag": "",
    "IsControlPrecision": "false",
    "ValidateRepeatJson": "false",
    "Model": {
        "FID": 0,
        "FBillTypeID": {
            "FNUMBER": ""
        },
        "FBillNo": "",
        "FApplicationDate": "1900-01-01",
        "FRequestType": "",
        "FApplicationOrgId": {
            "FNumber": ""
        },
        "FApplicationDeptId": {
            "FNumber": ""
        },
        "FApplicantId": {},
        "FCurrencyId": {
            "FNumber": ""
        },
        "FNote": "",
        "FSrcType": "",
        "FISPRICEEXCLUDETAX": "false",
        "FExchangeTypeId": {
            "FNumber": ""
        },
        "FIsConvert": "false",
        "FACCTYPE": "",
        "FCloseReason": "",
        "F_PDXT_Base": {
            "FNUMBER": ""
        },
        "F_QHHX_Text": "",
        "F_QHHX_Text1": "",
        "FMobBillHead": {
            "FEntryId": 0,
            "FExtendField": "",
            "FOrderName": "",
            "FIsMobBill": "false",
            "FMobIsPending": "false"
        },
        "FEntity": [
            {
                "FEntryID": 0,
                "FRequireOrgId": {
                    "FNumber": ""
                },
                "FMaterialId": {
                    "FNumber": ""
                },
                "FMaterialDesc": "",
                "FAuxpropId": {},
                "FUnitId": {
                    "FNumber": ""
                },
                "FReqQty": 0,
                "FApproveQty": 0,
                "FPurchaseOrgId": {
                    "FNumber": ""
                },
                "FSuggestSupplierId": {
                    "FNumber": ""
                },
                "FReceiveOrgId": {
                    "FNumber": ""
                },
                "FEvaluatePrice": 0,
                "FTAXPRICE": 0,
                "FTAXRATE": 0,
                "FPriceUnitId": {
                    "FNumber": ""
                },
                "FPriceUnitQty": 0,
                "FREQSTOCKUNITID": {
                    "FNumber": ""
                },
                "FREQSTOCKQTY": 0,
                "FLeadTime": 0,
                "FSupplierId": {
                    "FNumber": ""
                },
                "FChargeProjectID": {
                    "FNUMBER": ""
                },
                "FPurchaseDeptId": {
                    "FNumber": ""
                },
                "FReceiveAddress": "",
                "FEntryNote": "",
                "FPurchaserId": {
                    "FNUMBER": ""
                },
                "FPurchaseGroupId": {
                    "FNumber": ""
                },
                "FBOMNoId": {
                    "FNumber": ""
                },
                "FStockId": {
                    "FNumber": ""
                },
                "FProviderId": {
                    "FNumber": ""
                },
                "FMtoNo": "",
                "FBaseReqQty": 0,
                "FReceiveDeptId": {
                    "FNUMBER": ""
                },
                "FRequireDeptId": {
                    "FNUMBER": ""
                },
                "FSalUnitID": {
                    "FNumber": ""
                },
                "FSalQty": 0,
                "FSalBaseQty": 0,
                "FIsVmiBusiness": "false",
                "FDEMANDTYPE": "",
                "FDEMANDBILLNO": "",
                "F_PDXT_Date": "1900-01-01",
                "FDEMANDBILLENTRYSEQ": 0,
                "F_PDXT_Text": "",
                "FDEMANDBILLENTRYID": 0,
                "F_PDXT_Qty": 0,
                "F_PDXT_UnitID": {
                    "FNumber": ""
                },
                "FSrcReqMergeEntryIds": "",
                "FAssortBillNo": ""
            }
        ]
    }
}

这是生成的类

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;

namespace ConsoleApplication1
{
    public class FBillTypeID
    {
        /// <summary>
        /// 
        /// </summary>
        public string FNUMBER { get; set; }

    }
    public class FApplicationOrgId
    {
        /// <summary>
        /// 
        /// </summary>
        public string FNumber { get; set; }

    }
    public class FApplicationDeptId
    {
        /// <summary>
        /// 
        /// </summary>
        public string FNumber { get; set; }

    }
    public class FApplicantId
    {
    }
    public class FCurrencyId
    {
        /// <summary>
        /// 
        /// </summary>
        public string FNumber { get; set; }

    }
    public class FExchangeTypeId
    {
        /// <summary>
        /// 
        /// </summary>
        public string FNumber { get; set; }

    }
    public class F_PDXT_Base
    {
        /// <summary>
        /// 
        /// </summary>
        public string FNUMBER { get; set; }

    }
    public class FMobBillHead
    {
        /// <summary>
        /// 
        /// </summary>
        public int FEntryId { get; set; }

        /// <summary>
        /// 
        /// </summary>
        public string FExtendField { get; set; }

        /// <summary>
        /// 
        /// </summary>
        public string FOrderName { get; set; }

        /// <summary>
        /// 
        /// </summary>
        public string FIsMobBill { get; set; }

        /// <summary>
        /// 
        /// </summary>
        public string FMobIsPending { get; set; }

    }
    public class FRequireOrgId
    {
        /// <summary>
        /// 
        /// </summary>
        public string FNumber { get; set; }

    }
    public class FMaterialId
    {
        /// <summary>
        /// 
        /// </summary>
        public string FNumber { get; set; }

    }
    public class FAuxpropId
    {
    }
    public class FUnitId
    {
        /// <summary>
        /// 
        /// </summary>
        public string FNumber { get; set; }

    }
    public class FPurchaseOrgId
    {
        /// <summary>
        /// 
        /// </summary>
        public string FNumber { get; set; }

    }
    public class FSuggestSupplierId
    {
        /// <summary>
        /// 
        /// </summary>
        public string FNumber { get; set; }

    }
    public class FReceiveOrgId
    {
        /// <summary>
        /// 
        /// </summary>
        public string FNumber { get; set; }

    }
    public class FPriceUnitId
    {
        /// <summary>
        /// 
        /// </summary>
        public string FNumber { get; set; }

    }
    public class FREQSTOCKUNITID
    {
        /// <summary>
        /// 
        /// </summary>
        public string FNumber { get; set; }

    }
    public class FSupplierId
    {
        /// <summary>
        /// 
        /// </summary>
        public string FNumber { get; set; }

    }
    public class FChargeProjectID
    {
        /// <summary>
        /// 
        /// </summary>
        public string FNUMBER { get; set; }

    }
    public class FPurchaseDeptId
    {
        /// <summary>
        /// 
        /// </summary>
        public string FNumber { get; set; }

    }
    public class FPurchaserId
    {
        /// <summary>
        /// 
        /// </summary>
        public string FNUMBER { get; set; }

    }
    public class FPurchaseGroupId
    {
        /// <summary>
        /// 
        /// </summary>
        public string FNumber { get; set; }

    }
    public class FBOMNoId
    {
        /// <summary>
        /// 
        /// </summary>
        public string FNumber { get; set; }

    }
    public class FStockId
    {
        /// <summary>
        /// 
        /// </summary>
        public string FNumber { get; set; }

    }
    public class FProviderId
    {
        /// <summary>
        /// 
        /// </summary>
        public string FNumber { get; set; }

    }
    public class FReceiveDeptId
    {
        /// <summary>
        /// 
        /// </summary>
        public string FNUMBER { get; set; }

    }
    public class FRequireDeptId
    {
        /// <summary>
        /// 
        /// </summary>
        public string FNUMBER { get; set; }

    }
    public class FSalUnitID
    {
        /// <summary>
        /// 
        /// </summary>
        public string FNumber { get; set; }

    }
    public class F_PDXT_UnitID
    {
        /// <summary>
        /// 
        /// </summary>
        public string FNumber { get; set; }

    }
    public class FEntityItem
    {
        /// <summary>
        /// 
        /// </summary>
        public int FEntryID { get; set; }

        /// <summary>
        /// 
        /// </summary>
        public FRequireOrgId FRequireOrgId { get; set; }

        /// <summary>
        /// 
        /// </summary>
        public FMaterialId FMaterialId { get; set; }

        /// <summary>
        /// 
        /// </summary>
        public string FMaterialDesc { get; set; }

        /// <summary>
        /// 
        /// </summary>
        public FAuxpropId FAuxpropId { get; set; }

        /// <summary>
        /// 
        /// </summary>
        public FUnitId FUnitId { get; set; }

        /// <summary>
        /// 
        /// </summary>
        public int FReqQty { get; set; }

        /// <summary>
        /// 
        /// </summary>
        public int FApproveQty { get; set; }

        /// <summary>
        /// 
        /// </summary>
        public FPurchaseOrgId FPurchaseOrgId { get; set; }

        /// <summary>
        /// 
        /// </summary>
        public FSuggestSupplierId FSuggestSupplierId { get; set; }

        /// <summary>
        /// 
        /// </summary>
        public FReceiveOrgId FReceiveOrgId { get; set; }

        /// <summary>
        /// 
        /// </summary>
        public int FEvaluatePrice { get; set; }

        /// <summary>
        /// 
        /// </summary>
        public int FTAXPRICE { get; set; }

        /// <summary>
        /// 
        /// </summary>
        public int FTAXRATE { get; set; }

        /// <summary>
        /// 
        /// </summary>
        public FPriceUnitId FPriceUnitId { get; set; }

        /// <summary>
        /// 
        /// </summary>
        public int FPriceUnitQty { get; set; }

        /// <summary>
        /// 
        /// </summary>
        public FREQSTOCKUNITID FREQSTOCKUNITID { get; set; }

        /// <summary>
        /// 
        /// </summary>
        public int FREQSTOCKQTY { get; set; }

        /// <summary>
        /// 
        /// </summary>
        public int FLeadTime { get; set; }

        /// <summary>
        /// 
        /// </summary>
        public FSupplierId FSupplierId { get; set; }

        /// <summary>
        /// 
        /// </summary>
        public FChargeProjectID FChargeProjectID { get; set; }

        /// <summary>
        /// 
        /// </summary>
        public FPurchaseDeptId FPurchaseDeptId { get; set; }

        /// <summary>
        /// 
        /// </summary>
        public string FReceiveAddress { get; set; }

        /// <summary>
        /// 
        /// </summary>
        public string FEntryNote { get; set; }

        /// <summary>
        /// 
        /// </summary>
        public FPurchaserId FPurchaserId { get; set; }

        /// <summary>
        /// 
        /// </summary>
        public FPurchaseGroupId FPurchaseGroupId { get; set; }

        /// <summary>
        /// 
        /// </summary>
        public FBOMNoId FBOMNoId { get; set; }

        /// <summary>
        /// 
        /// </summary>
        public FStockId FStockId { get; set; }

        /// <summary>
        /// 
        /// </summary>
        public FProviderId FProviderId { get; set; }

        /// <summary>
        /// 
        /// </summary>
        public string FMtoNo { get; set; }

        /// <summary>
        /// 
        /// </summary>
        public int FBaseReqQty { get; set; }

        /// <summary>
        /// 
        /// </summary>
        public FReceiveDeptId FReceiveDeptId { get; set; }

        /// <summary>
        /// 
        /// </summary>
        public FRequireDeptId FRequireDeptId { get; set; }

        /// <summary>
        /// 
        /// </summary>
        public FSalUnitID FSalUnitID { get; set; }

        /// <summary>
        /// 
        /// </summary>
        public int FSalQty { get; set; }

        /// <summary>
        /// 
        /// </summary>
        public int FSalBaseQty { get; set; }

        /// <summary>
        /// 
        /// </summary>
        public string FIsVmiBusiness { get; set; }

        /// <summary>
        /// 
        /// </summary>
        public string FDEMANDTYPE { get; set; }

        /// <summary>
        /// 
        /// </summary>
        public string FDEMANDBILLNO { get; set; }

        /// <summary>
        /// 
        /// </summary>
        public string F_PDXT_Date { get; set; }

        /// <summary>
        /// 
        /// </summary>
        public int FDEMANDBILLENTRYSEQ { get; set; }

        /// <summary>
        /// 
        /// </summary>
        public string F_PDXT_Text { get; set; }

        /// <summary>
        /// 
        /// </summary>
        public int FDEMANDBILLENTRYID { get; set; }

        /// <summary>
        /// 
        /// </summary>
        public int F_PDXT_Qty { get; set; }

        /// <summary>
        /// 
        /// </summary>
        public F_PDXT_UnitID F_PDXT_UnitID { get; set; }

        /// <summary>
        /// 
        /// </summary>
        public string FSrcReqMergeEntryIds { get; set; }

        /// <summary>
        /// 
        /// </summary>
        public string FAssortBillNo { get; set; }

    }
    public class Model
    {
        /// <summary>
        /// 
        /// </summary>
        public int FID { get; set; }

        /// <summary>
        /// 
        /// </summary>
        public FBillTypeID FBillTypeID { get; set; }

        /// <summary>
        /// 
        /// </summary>
        public string FBillNo { get; set; }

        /// <summary>
        /// 
        /// </summary>
        public string FApplicationDate { get; set; }

        /// <summary>
        /// 
        /// </summary>
        public string FRequestType { get; set; }

        /// <summary>
        /// 
        /// </summary>
        public FApplicationOrgId FApplicationOrgId { get; set; }

        /// <summary>
        /// 
        /// </summary>
        public FApplicationDeptId FApplicationDeptId { get; set; }

        /// <summary>
        /// 
        /// </summary>
        public FApplicantId FApplicantId { get; set; }

        /// <summary>
        /// 
        /// </summary>
        public FCurrencyId FCurrencyId { get; set; }

        /// <summary>
        /// 
        /// </summary>
        public string FNote { get; set; }

        /// <summary>
        /// 
        /// </summary>
        public string FSrcType { get; set; }

        /// <summary>
        /// 
        /// </summary>
        public string FISPRICEEXCLUDETAX { get; set; }

        /// <summary>
        /// 
        /// </summary>
        public FExchangeTypeId FExchangeTypeId { get; set; }

        /// <summary>
        /// 
        /// </summary>
        public string FIsConvert { get; set; }

        /// <summary>
        /// 
        /// </summary>
        public string FACCTYPE { get; set; }

        /// <summary>
        /// 
        /// </summary>
        public string FCloseReason { get; set; }

        /// <summary>
        /// 
        /// </summary>
        public F_PDXT_Base F_PDXT_Base { get; set; }

        /// <summary>
        /// 
        /// </summary>
        public string F_QHHX_Text { get; set; }

        /// <summary>
        /// 
        /// </summary>
        public string F_QHHX_Text1 { get; set; }

        /// <summary>
        /// 
        /// </summary>
        public FMobBillHead FMobBillHead { get; set; }

        /// <summary>
        /// 
        /// </summary>
        public List<FEntityItem> FEntity { get; set; }

    }
    public class Root
    {
        /// <summary>
        /// 
        /// </summary>
        public List<string> NeedUpDateFields { get; set; }

        /// <summary>
        /// 
        /// </summary>
        public List<string> NeedReturnFields { get; set; }

        /// <summary>
        /// 
        /// </summary>
        public string IsDeleteEntry { get; set; }

        /// <summary>
        /// 
        /// </summary>
        public string SubSystemId { get; set; }

        /// <summary>
        /// 
        /// </summary>
        public string IsVerifyBaseDataField { get; set; }

        /// <summary>
        /// 
        /// </summary>
        public string IsEntryBatchFill { get; set; }

        /// <summary>
        /// 
        /// </summary>
        public string ValidateFlag { get; set; }

        /// <summary>
        /// 
        /// </summary>
        public string NumberSearch { get; set; }

        /// <summary>
        /// 
        /// </summary>
        public string IsAutoAdjustField { get; set; }

        /// <summary>
        /// 
        /// </summary>
        public string InterationFlags { get; set; }

        /// <summary>
        /// 
        /// </summary>
        public string IgnoreInterationFlag { get; set; }

        /// <summary>
        /// 
        /// </summary>
        public string IsControlPrecision { get; set; }

        /// <summary>
        /// 
        /// </summary>
        public string ValidateRepeatJson { get; set; }

        /// <summary>
        /// 
        /// </summary>
        public Model Model { get; set; }

    }
}

因为没有构造函数，所以需要用到的成员变量都得自己new一下。new个Module()，new个List<FEntityItem>()，不然就报空指针异常。

static void Main(string[] args)
{
        Root r = new Root();
        r.Model = new Model();
        r.Model.FEntity = new List<FEntityItem>();
        FEntityItem e = new FEntityItem();
        e.FMtoNo = "计划跟踪号号号号号号";
        r.Model.FEntity.Add(e);
        Console.WriteLine(JsonConvert.SerializeObject(r));
}

产品问题第三方网站把json字符串转换成c#类的时候没有构造函数，怎么办？

20 产品问题 第三方网站把json字符串转换成c#类的时候没有构造函数，怎么办？

恭喜您！

产品问题
第三方网站把json字符串转换成c#类的时候没有构造函数，怎么办？

20 产品问题第三方网站把json字符串转换成c#类的时候没有构造函数，怎么办？