为什么 Entity Framework Core 试图将我的字符串键转换为整数？

Question

更新

SET ANSI_NULLS ON
GO

SET QUOTED_IDENTIFIER ON
GO

CREATE TABLE [dbo].[bmaitempic](
    [itemnmbr] [char](31) NOT NULL,
    [fileseq] [int] NOT NULL,
    [filename] [nvarchar](255) NULL,
    [filedata] [varbinary](max) NULL,
    [Compressed File Data] [varbinary](max) NULL    
 CONSTRAINT [PK_BMAITEMPIC] PRIMARY KEY CLUSTERED 
(
    [fileseq] ASC,
    [itemnmbr] ASC
)WITH (PAD_INDEX = OFF, STATISTICS_NORECOMPUTE = OFF, IGNORE_DUP_KEY = OFF, ALLOW_ROW_LOCKS = ON, ALLOW_PAGE_LOCKS = ON, OPTIMIZE_FOR_SEQUENTIAL_KEY = OFF) ON [PRIMARY]
) ON [PRIMARY] TEXTIMAGE_ON [PRIMARY]
GO

我有一个带有复合键的简单模型：

[Table("bmaitempic")]
public class EcommerceItemImages
{
    [Column("itemnmbr")]
    [StringLength(31)]
    public string Itemnmbr { get; set; }

    [Column("fileseq")]
    public int Fileseq { get; set; }

    [Column("filename")]
    [StringLength(255)]
    public string Filename { get; set; }

    [Column("filedata")]
    public byte[] ImageData { get; set; }
    
    [Column("Compressed File Data")]
    public byte[] CompressedImageData { get; set; }
}

在我的 DbContext 中是这样的：

public class EntityContext : DbContext
{
    public EntityContext(DbContextOptions<EntityContext> options)
        : base(options)
    {
        
    }

    public DbSet<EcommerceItemImages> Images { get; set; }
    
    protected override void OnModelCreating(ModelBuilder modelBuilder)
    {
        modelBuilder.Entity<EcommerceItemImages>()
            .HasKey(x => new { x.Itemnmbr, x.Fileseq });
    }
}

我在 Winforms 按钮按下事件中有一个方法，我在 SaveChanges() 上遇到异常：

    private void btnConvert_Click(object sender, EventArgs e)
    {
        _context.Images.Load();

        var images = _context.Images.Local.ToBindingList();

        foreach (var image in images)
        {
            if(image.ImageData != null)
                image.CompressedImageData = Compress(image.ImageData);
        }

        var count = _context.SaveChanges();

        MessageBox.Show($@"{count} images compressed.");
    }

例外是：

Microsoft.EntityFrameworkCore.DbUpdateException
  HResult=0x80131500
  Message=An error occurred while updating the entries. See the inner exception for details.
  Source=Microsoft.EntityFrameworkCore.Relational
  StackTrace:
   at Microsoft.EntityFrameworkCore.Update.ReaderModificationCommandBatch.Execute(IRelationalConnection connection)
   at Microsoft.EntityFrameworkCore.Update.Internal.BatchExecutor.Execute(IEnumerable`1 commandBatches, IRelationalConnection connection)
   at Microsoft.EntityFrameworkCore.Storage.RelationalDatabase.SaveChanges(IList`1 entries)
   at Microsoft.EntityFrameworkCore.ChangeTracking.Internal.StateManager.SaveChanges(IList`1 entriesToSave)
   at Microsoft.EntityFrameworkCore.ChangeTracking.Internal.StateManager.SaveChanges(DbContext _, Boolean acceptAllChangesOnSuccess)
   at Microsoft.EntityFrameworkCore.SqlServer.Storage.Internal.SqlServerExecutionStrategy.Execute[TState,TResult](TState state, Func`3 operation, Func`3 verifySucceeded)
   at Microsoft.EntityFrameworkCore.ChangeTracking.Internal.StateManager.SaveChanges(Boolean acceptAllChangesOnSuccess)
   at Microsoft.EntityFrameworkCore.DbContext.SaveChanges(Boolean acceptAllChangesOnSuccess)
   at Microsoft.EntityFrameworkCore.DbContext.SaveChanges()
   at CompressImages.Form1.btnConvert_Click(Object sender, EventArgs e) in D:\Projects\NewEcommerce\CompressImages\Form1.cs:line 43
   at System.Windows.Forms.Control.OnClick(EventArgs e)
   at System.Windows.Forms.Button.OnClick(EventArgs e)
   at System.Windows.Forms.Button.OnMouseUp(MouseEventArgs mevent)
   at System.Windows.Forms.Control.WmMouseUp(Message& m, MouseButtons button, Int32 clicks)
   at System.Windows.Forms.Control.WndProc(Message& m)
   at System.Windows.Forms.ButtonBase.WndProc(Message& m)
   at System.Windows.Forms.Button.WndProc(Message& m)
   at System.Windows.Forms.Control.ControlNativeWindow.WndProc(Message& m)
   at System.Windows.Forms.NativeWindow.Callback(IntPtr hWnd, WM msg, IntPtr wparam, IntPtr lparam)

  This exception was originally thrown at this call stack:
    [External Code]

Inner Exception 1:
SqlException: Conversion failed when converting the varchar value '1-A3483A                       ' to data type int.

'1-A3483A ' 是第一条记录的Itemnmbr并且是复合键的一部分。 为什么 EntityFramework Core 试图将其转换为整数？

更新

日志条目：

Failed executing DbCommand (56ms) 
[Parameters=[@p1='16384', @p2='1-A3483A ' (Nullable = false) (Size = 31), @p0='0x1F8B080000000000000AAD5707501340974E202111A497808418A44A535A0202...' (Size = 8000)], 
CommandType='Text', CommandTimeout='30'] 
SET NOCOUNT ON; 
UPDATE [bmaitempic] SET [Compressed File Data] = @p0 WHERE [fileseq] = @p1 AND [itemnmbr] = @p2; 
SELECT @@ROWCOUNT;

Answer 1

为了完整性：

解决方案：我在表上有一个 sql UPDATE Trigger。 我禁用了它。 @LJRishe 在评论中提供了修复。