EF无法将double转换为single

Question

我收到一个错误:

"'EoiQuote'上的'BomAmountTaxRate'属性无法设置为'System.Double'值.您必须将此属性设置为'System.Single'类型的非null值."

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

而EoiQuote POCO如下:

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,正常情况下,EF错误绝对没有任何意义.float = float:对吗？

Answer 1

SQL中的float与.Net中的float不同.如果查看SqlDbType枚举表,您会发现SQL float等效于double类型.

浮子>双.浮点数在-1.79E +308到1.79E +308范围内.

来自C#参考:

在.Net中,float是System.Single类型的别名.

-3.4×10 ³⁸至+ 3.4 ×10 ³⁸