C# EF无法将双精度转换为单精度

我收到一个错误：

“无法将'EOIQote'上的'BomAmountTaxRate'属性设置为 “System.Double”值。必须将此属性设置为非空值 类型为“System.Single”

db表架构是：

QuoteID                 uniqueidentifier    Unchecked
SubmissionDate          datetime    Unchecked
RfqID                   uniqueidentifier    Unchecked
SupplierID                  uniqueidentifier    Unchecked
SupplierRef nvarchar(50)    Checked
BomAmountExTax          decimal(18, 2)  Unchecked
BomAmountCurrencyID         int Unchecked
BomAmountTaxRate            float   Unchecked
BomTaxAmount            decimal(18, 0)  Unchecked
FreightAmountExTax          decimal(18, 0)  Unchecked
FreightAmountCurrencyID int Unchecked
FreightAmountTaxRate    float   Unchecked
FreightTaxAmount            decimal(18, 0)  Unchecked
FreeFormParticulars         text    Checked
AvailabilityOpeningDate datetime    Checked
AvailabilityClosingDate datetime    Checked
Status                  int Unchecked
TransactionID   uniqueidentifier    Checked
Quantity                    int Unchecked
LastModified    datetime    Unchecked
ReviewedDate    datetime    Checked
RevisionID                 tinyint  Checked

和EOIQOUTE POCO，如下所示：

public class EoiQuote
    {
        public Guid QuoteID { get; set; }

        public DateTime SubmissionDate { get; set; }

        public Guid RfqID { get; set; }

        public Guid SupplierID { get; set; }

        public string SupplierRef { get; set; }

        public decimal BomAmountExTax { get; set; }

        public int BomAmountCurrencyID { get; set; }

        public float BomAmountTaxRate { get; set; }

        public decimal BomTaxAmount { get; set; }

        public decimal FreightAmountExTax { get; set; }

        public int FreightAmountCurrencyID { get; set; }

        public float FreightAmountTaxRate { get; set; }

        public decimal FreightTaxAmount { get; set; }

        public string FreeFormParticulars { get; set; }

        public DateTime AvailabilityOpeningDate { get; set; }

        public DateTime AvailabilityClosingDate { get; set; }

        public int Status { get; set; }

        public Guid TransactionID { get; set; }

        public int Quantity { get; set; }

        public DateTime LastModified { get; set; }


        public EoiQuote()
        {
        }

    }

---

因此，按照惯例，EF误差完全没有任何意义。浮点=浮点：对吗？

SQL中的浮点与.Net中的浮点不同。若您查看SqlDbType枚举表，就会发现SQLFLOAT等价于双精度类型

浮动->双精度。介于-1.79E+308到1.79E+308之间的浮点数

发件人：

在.Net中，浮点是System.Single类型的别名

-3.4×1038至+3.4×1038