c# - 无效的列名称 ID-Entity Framework

Question

我的数据库中有这样结构的表:

CREATE TABLE [dbo].[FDTransaction]
(
    [ID] [int] IDENTITY(1,1) NOT NULL,
    [FamilyId] [int] NULL,
    [BankId] [int] NULL,
    [Account_No] [numeric](25, 0) NULL,
    [Amount] [int] NULL,
    [Interest_Percent] [decimal](18, 0) NULL,
    [Tenure] [int] NULL,
    [MaturityDate] [datetime] NULL,
    [InterestAmount] [int] NULL,

    CONSTRAINT [PK_FDTransaction] 
        PRIMARY KEY CLUSTERED ([ID] ASC)
) ON [PRIMARY]

我有一个模型类，它代表代码中的数据库表:

 public class FDTransaction
 {
        [Key]
        public int ID { get; set; }     
        public int Familyid { get; set; }
        public int BankId { get; set; }
        public decimal Account_No { get; set; }
        public int Amount { get; set; }
        public double Interest_Percent { get; set; }
        public int Tenure { get; set; }
        public DateTime MaturityDate { get; set; }
        public int interestAmount { get; set; }
}

当我在下面提到的行的表中添加记录时出现错误。

dbentities.Transactions.Add(transaction);

下面还有错误堆栈。

       StackTrace:
            at System.Data.Entity.Core.Mapping.Update.Internal.UpdateTranslator.Update()
            at System.Data.Entity.Core.EntityClient.Internal.EntityAdapter.<Update>b__2(UpdateTranslator ut)
            at System.Data.Entity.Core.EntityClient.Internal.EntityAdapter.Update[T](T noChangesResult, Func`2 updateFunction)
            at System.Data.Entity.Core.EntityClient.Internal.EntityAdapter.Update()
            at System.Data.Entity.Core.Objects.ObjectContext.<SaveChangesToStore>b__35()
            at System.Data.Entity.Core.Objects.ObjectContext.ExecuteInTransaction[T](Func`1 func, IDbExecutionStrategy executionStrategy, Boolean startLocalTransaction, Boolean releaseConnectionOnSuccess)
            at System.Data.Entity.Core.Objects.ObjectContext.SaveChangesToStore(SaveOptions options, IDbExecutionStrategy executionStrategy, Boolean startLocalTransaction)
            at System.Data.Entity.Core.Objects.ObjectContext.<>c__DisplayClass2a.<SaveChangesInternal>b__27()
            at System.Data.Entity.SqlServer.DefaultSqlExecutionStrategy.Execute[TResult](Func`1 operation)
            at System.Data.Entity.Core.Objects.ObjectContext.SaveChangesInternal(SaveOptions options, Boolean executeInExistingTransaction)
            at System.Data.Entity.Core.Objects.ObjectContext.SaveChanges(SaveOptions options)
            at System.Data.Entity.Internal.InternalContext.SaveChanges()
       InnerException: System.Data.SqlClient.SqlException
            HResult=-2146232060
            Message=Invalid column name 'ID'.
Invalid column name 'ID'.
            Source=.Net SqlClient Data Provider
            ErrorCode=-2146232060
            Class=16
            LineNumber=5
            Number=207

如上所述，我在表中确实有列 ID。我在 FDTransaction 类中也有属性 ID。我仍然无法在数据库中添加行。

Answer 1

自 ID列是 IDENTITY列，您需要将另一个属性( [DatabaseGenerated] )添加到您的 ID模型类中的字段告诉 EF 这是一个 IDENTITY列，它不需要提供值 - SQL Server 将在您插入行时设置值。

试试这个:

public class FDTransaction
{
    [Key]
    [DatabaseGenerated(DatabaseGeneratedOption.Identity)]
    public int ID { get; set; }     
    .... (your other properties here, same as before) ......  
}