C# 指定的成员'；索赔类型ID'；在LINQ to实体中不支持

目前我有一个错误，它阻止我从数据库返回任何数据。我通过了LINQ连接，然后当我将鼠标悬停在保存数据的模型上时，它会显示错误消息。我确实注释掉了连接中的几行，它起作用了，所以我已经确定了错误在哪里。我只是需要一些帮助来理解这个错误以及它发生的原因

SQL存储库：

public IQueryable<ClaimNumberReport> GetClaimsByClaimNumber(int ClientID, int ClaimID) {
            return (from d in camOnlineDb.Details
                    join a in camOnlineDb.Areas
                        on new { a = d.ClientID, b = d.AreaID ?? 0 }
                    equals new { a = a.ClientID, b = a.AreaID }
                    where d.ClientID == ClientID

                    join r in camOnlineDb.Reasons
                        on new { a = d.ClientID, b = d.ReasonID ?? 0 }
                    equals new { a = r.ClientID, b = r.ReasonID }

                    join sd in camOnlineDb.SuppDepts
                     on new { a = d.ClientID, b = d.CategoryID ?? 0 }
                 equals new { a = sd.ClientID, b = sd.CategoryID }

                    join h in camOnlineDb.Headers
                        on new { d.ClientID, d.ClaimID }
                    equals new { h.ClientID, h.ClaimID }
                    where d.ClaimID == ClaimID

                    join su in camOnlineDb.Suppliers
                        on new { h.ClientID, h.SupplierID }
                    equals new { su.ClientID, su.SupplierID }

                    join cp in camOnlineDb.ClaimPacks
                        on new { h.ClientID, h.ClaimID }
                    equals new { cp.ClientID, cp.ClaimID }

                    join rev in camOnlineDb.Reviews
                        on new { h.ClientID, h.ReviewID }
                    equals new { rev.ClientID, rev.ReviewID }

                    join revp in camOnlineDb.ReviewPeriods
                        on new { a = rev.ClientID, b = rev.ReviewPeriodID ?? 0 }
                    equals new { a = revp.ClientID, b = revp.ReviewPeriodID }

                    join st in camOnlineDb.Statuses
                        on new { a = d.ClientID, b = d.StatusID ?? 0 }
                    equals new { a = st.ClientID, b = st.StatusID }

                    join stcm in camOnlineDb.StatusCategoryMappings
                        on new { st.ClientID, st.StatusID }
                    equals new { stcm.ClientID, stcm.StatusID }

                    join stc in camOnlineDb.StatusCategories
                        on new { stcm.StatusCategoryID }
                    equals new { stc.StatusCategoryID }

                    select new ClaimNumberReport {
                        // Changed type to sub type and dropped type
                        TypeID = d.ClaimTypeID,
                        // Needs changed to PDF file address
                        CPAttached = cp.Comment,
                        ReviewName = revp.ReviewPeriodName,
                        ClaimID = d.ClaimID,
                        Line = d.ClaimLine,
                        AccountNo = su.AccountNo,
                        SupplierName = su.SupplierName,
                        Amount = d.Amount,
                        Status = st.StatusDesc,
                        DateSent = d.DateSent,
                        DayOS = d.DaysOS,
                        NominalPeriod = d.NominalPeriod,
                        SLInvoiceNo = d.SLInvoiceNo,
                        Area = a.AreaDesc,
                        DebitRef = d.DebitFile,
                        DebitDate = d.JournalDate,
                        DeductDate = d.DeductDate,
                        StatusCategoryDesc = stc.StatusCategoryDesc,
                        APLReason = r.ReasonDesc,
                        DeptNo = sd.DepartmentID,
                        DeptName = sd.DepartmentName,
                        // The below 4 need to change, I believe that this may be done on the view or controller.
                        //Settled = d.Amount,
                        //Cancelled = d.Amount,
                        //Conversation = d.Amount,
                        //WIP = d.Amount
                    });
        }

ClaimNumberReportClass：

  public class ClaimNumberReport {

        public int ClaimID { get; set; }

        public string ReviewName { get; set; }
        public char? TypeID { get; set; }
        public char OldTypeID { get; set; }

        public string CPAttached { get; set; }

        public int? Line { get; set; }
        public string AccountNo { get; set; }
        public string SupplierName { get; set; }
        [DataType(DataType.Currency)]
        public decimal? Amount { get; set; }

        public string Status { get; set; }
        public DateTime? DateSent { get; set; }
        public int? DayOS { get; set; }

        public int? NominalPeriod { get; set; }

        public string SLInvoiceNo { get; set; }

        public string Area { get; set; }
        public string DebitRef { get; set; }
        public DateTime? DebitDate { get; set; }
        public DateTime? DeductDate { get; set; }
        public string StatusCategoryDesc { get; set; }
        public string APLReason { get; set; }
        public int ClientID { get; set; }

        public int DeptNo { get; set; }

        public string DeptName { get; set; }
        [DataType(DataType.Currency)]
        public decimal Settled { get; set; }
        [DataType(DataType.Currency)]
        public decimal Cancelled { get; set; }
        public decimal Conversation { get; set; }
        [DataType(DataType.Currency)]
        public decimal WIP { get; set; }
    }

---

当我到达视图并尝试显示数据时，它会显示错误消息，但当我将鼠标悬停在模型的返回视图行上时，它会显示错误消息。

这与数据类型char有关。在我的数据库中，ClaimTypeID是一个字符。但是，在VisualStudio中，字符与SQL字符不同，因为它只允许一个字符。因此，我不得不将其改为字符串。

我一直在使用该线程，它似乎没有给我多少帮助您在

getclaimsbycaimnumber

中遇到错误？是

ClaimTypeID

您的类的成员

Details

？@MairajAhmad我在视图中看到了错误。但是是的，ClaimTypeID是我的Details类的成员。它是可以为空的，就像在SupportDepts类排序中一样

char

不是实体框架中的。它在C#和.NET中完全有效，但EF将任何字符类型（甚至

char（1）

）映射到字符串。

  public class ClaimNumberReport {

        public int ClaimID { get; set; }

        public string ReviewName { get; set; }
        public char? TypeID { get; set; }
        public char OldTypeID { get; set; }

        public string CPAttached { get; set; }

        public int? Line { get; set; }
        public string AccountNo { get; set; }
        public string SupplierName { get; set; }
        [DataType(DataType.Currency)]
        public decimal? Amount { get; set; }

        public string Status { get; set; }
        public DateTime? DateSent { get; set; }
        public int? DayOS { get; set; }

        public int? NominalPeriod { get; set; }

        public string SLInvoiceNo { get; set; }

        public string Area { get; set; }
        public string DebitRef { get; set; }
        public DateTime? DebitDate { get; set; }
        public DateTime? DeductDate { get; set; }
        public string StatusCategoryDesc { get; set; }
        public string APLReason { get; set; }
        public int ClientID { get; set; }

        public int DeptNo { get; set; }

        public string DeptName { get; set; }
        [DataType(DataType.Currency)]
        public decimal Settled { get; set; }
        [DataType(DataType.Currency)]
        public decimal Cancelled { get; set; }
        public decimal Conversation { get; set; }
        [DataType(DataType.Currency)]
        public decimal WIP { get; set; }
    }