如何判断哪个 table 列导致无效转换异常？

Question

使用 EF Core 3.1，我尝试使用以下代码从数据库（SQL 服务器）获取 table：

query = dbContext.Set<Entity>().ToList();

该代码适用于其他 table，但在特定 table 上失败，但出现以下异常：

System.InvalidCastException: Unable to cast object of type 'System.Byte' to type 'System.Int32'.
   at Microsoft.Data.SqlClient.SqlBuffer.get_Int32()
   at Microsoft.Data.SqlClient.SqlDataReader.GetInt32(Int32 i)
   at lambda_method(Closure , QueryContext , DbDataReader , ResultContext , Int32[] , ResultCoordinator )
   at Microsoft.EntityFrameworkCore.Query.Internal.QueryingEnumerable`1.Enumerator.MoveNext()
   at System.Collections.Generic.List`1..ctor(IEnumerable`1 collection)
   at System.Linq.Enumerable.ToList[TSource](IEnumerable`1 source)

在 try-catch 中使用断点没有帮助，因为内部异常为空。我如何判断哪个 table 列导致转换异常？

型号代码：

[Table("Plugin")]
public partial class Plugin
{
public Plugin()
{
    SetAPlugins = new HashSet<SetProfile>();
    SetBplugins = new HashSet<SetProfile>();
    SetBPlugins = new HashSet<SetProfile>();
    SetBPlugins = new HashSet<SetProfile>();
    SetBPlugins = new HashSet<SetProfile>();
}   

[Key]
[Column("ID")]
public Guid ID { get; set; }
public int Serial { get; set; }
[Column(TypeName = "datetime")]
public DateTime? DateCreated { get; set; }
[Column(TypeName = "datetime")]
public DateTime? DateModified { get; set; }
public ObjectStatus ObjectStatus { get; set; }
[Required]
public byte[] Timestamp { get; set; }
public PluginType Type { get; set; }
[StringLength(64)]
public string Name { get; set; }
[StringLength(512)]
public string ProcessorAssembly { get; set; }
[StringLength(512)]
public string ProcessorClass { get; set; }
[StringLength(512)]
public string AdminAssembly { get; set; }
[StringLength(512)]
public string AdminClass { get; set; }
[StringLength(32)]
public string ConfigName { get; set; }
public ProfileType SubType { get; set; }
[StringLength(256)]
public string ContainerType { get; set; }
[StringLength(256)]
public string SupportedFeatures { get; set; }

[InverseProperty(nameof(SetProfile.SetAPlugin))]
public virtual ICollection<SetProfile> SetAPlugins { get; set; }
[InverseProperty(nameof(SetProfile.SetBplugin))]
public virtual ICollection<SetProfile> SetBPlugins { get; set; }
[InverseProperty(nameof(SetProfile.SetCPlugin))]
public virtual ICollection<SetProfile> SetCPlugins { get; set; }
[InverseProperty(nameof(SetProfile.SetDPlugin))]
public virtual ICollection<SetProfile> SetDPlugins { get; set; }
[InverseProperty(nameof(SetProfile.SetEPlugin))]
public virtual ICollection<SetProfile> SetEPlugins { get; set; }
}

我附上了 SSMS 数据库列的屏幕截图。

Answer 1

您正在将属性映射为 int，这应该是 byte，并且只有一个属性映射为 int，即 Serial，所以应该是那个。

Answer 2

问题是

public ObjectStatus ObjectStatus { get; set; }

& 必须按如下方式创建枚举：

public enum ObjectStatus : byte
{
    //List of values
}

Answer 3

问题是 SQL 类型是 tinyint，它在代码中是一个字节，不能隐式转换为枚举。我使用以下代码解决了这个问题：

        [Column("ObjectStatus")]
        public Byte objectStatus { get; set; }

        [NotMapped]
        public ObjectStatus ObjectStatus
        {
            get
            {
                if (objectStatus > 0)               
                    return (ObjectStatus)objectStatus;            
                else
                    return ObjectStatus.Active;
            }
            set
            {
                objectStatus = (Byte)value;
            }
        }

如何判断哪个 table 列导致无效转换异常？

How to tell which table column is causing an invalid cast exception?

c#

ef-core-3.1