我正在使用 NET CORE 3.1 实现 Mysql.EntityFramework.Core。在获取数据时出现错误:"无法将类型为 'System.String' 的对象转换为类型 'System.Byte[]'"。
示例:
public new async Task<IList<Rol>> GetAllAsync(Expression<Func<Rol, bool>> condition)
{
var roles = await _dbContext.Rol // <=== HERE Line 26 RolDataStore
.Where(condition).ToListAsync();
return roles;
}
在我的配置DAL上下文中说:
public static void ConfigureDALContext(this IServiceCollection services, string dbConnection)
{
services.AddDbContext<MyDbContext>(options =>
{
options.UseMySQL(dbConnection);
});
}
模型角色:
public class Rol : IEntity, ISoftDeleteEntity
{
private Guid _id;
public Guid Id
{
get
{
return _id == Guid.Empty ? Guid.NewGuid() : _id;
}
set
{
_id = value;
}
}
public string Nombre { get; set; }
public string Descripcion { get; set; }
public virtual ICollection<Usuario> Usuarios { get; set; }
public DateTime? FechaBaja { get; set; }
}
以及“Rol”表:
异常:
System.InvalidCastException: Unable to cast object of type 'System.String' to type 'System.Byte[]'.
at System.Data.Common.DbDataReader.GetFieldValue[T](Int32 ordinal)
at MySql.Data.MySqlClient.MySqlDataReader.GetFieldValue[T](Int32 ordinal)
at lambda_method(Closure , QueryContext , DbDataReader , ResultContext , Int32[] , ResultCoordinator )
at Microsoft.EntityFrameworkCore.Query.Internal.QueryingEnumerable`1.AsyncEnumerator.MoveNextAsync()
Excepción producida: 'System.InvalidCastException' en System.Private.CoreLib.dll
System.InvalidCastException: Unable to cast object of type 'System.String' to type 'System.Byte[]'.
at System.Data.Common.DbDataReader.GetFieldValue[T](Int32 ordinal)
at MySql.Data.MySqlClient.MySqlDataReader.GetFieldValue[T](Int32 ordinal)
at lambda_method(Closure , QueryContext , DbDataReader , ResultContext , Int32[] , ResultCoordinator )
at Microsoft.EntityFrameworkCore.Query.Internal.QueryingEnumerable`1.AsyncEnumerator.MoveNextAsync()
at Microsoft.EntityFrameworkCore.EntityFrameworkQueryableExtensions.ToListAsync[TSource](IQueryable`1 source, CancellationToken cancellationToken)
at Microsoft.EntityFrameworkCore.EntityFrameworkQueryableExtensions.ToListAsync[TSource](IQueryable`1 source, CancellationToken cancellationToken)
at GPS.DAL.DataStores.RolDataStore.GetAllAsync(Expression`1 condition) in D:\PROYECTOS\GPSimracing\gpsimracing\api\GPS.DAL\DataStores\RolDataStore.cs:line 26
有人能帮忙解决吗?