I am using the CompiledQueries feature of the framewok core 2.0 entity but even though it does not syntax error, when the program is running, I get this exception:
Could not parse expression 'value (Microsoft.EntityFrameworkCore.Query.Internal.EntityQueryable'1 [TaskManager.Entities.EntitiesDB.USER]) AsNoTracking (). Onde (__ conditions) ': The given arguments did not match the expected arguments: Object of type 'System.Linq.Expressions.TypedParameterExpression' can not be converted to type 'System.Linq.Expressions.LambdaExpression'.
I have no idea what it is. I Need help.
Here is the source code of my repository which displays this error:
/// <summary>
/// Query of user
/// </summary>
/// <param name="_context">context</param>
/// <param name="conditions">conditions for clause "Where"</param>
/// <returns>first task that meets the conditions or null </returns>
private static Func<Context, Func<USER, bool>, Task<UserResponseDTO>> _getUser = EF.CompileAsyncQuery
(
(Context _context, Func<USER, bool> conditions) =>
(conditions == null)?
_context.USER.Select(user =>
new UserResponseDTO {
NAME = user.NAME,
EMAIL = user.EMAIL,
SEQUSER = user.SEQUSER,
DATEREGISTER = user.DATEREGISTER
}
).AsNoTracking().FirstOrDefault ()
:
_context.USER.AsNoTracking()
.Where(conditions).Select(user =>
new UserResponseDTO {
NAME = user.NAME,
EMAIL = user.EMAIL,
SEQUSER = user.SEQUSER,
DATEREGISTER = user.DATEREGISTER
}
).FirstOrDefault ()
);
My class that implements DbContext:
public class Context: DbContext
{
public Context(DbContextOptions<Context> options): base(options){ }
public virtual DbSet<USER> USER { get; set; }
public virtual DbSet<TASK> TASK { get; set; }
protected override void OnModelCreating(ModelBuilder modelBuilder){
#region Sequences
modelBuilder.HasSequence<long>
("S_SEQUSER").StartsAt(1).HasMin(1);
modelBuilder.HasSequence<long>
("S_SEQTASK").StartsAt(1).HasMin(1);
#endregion
#region propeties Mapping
modelBuilder.Entity<USER>()
.Property(u => u.SEQUSER)
.HasDefaultValueSql(" nextval('\"S_SEQUSER\"') ");
modelBuilder.Entity<TASK>()
.Property(u => u.SEQTASK)
.HasDefaultValueSql(" nextval('\"S_SEQTASK\"') ");
modelBuilder.Entity<USER>()
.HasMany(u => u.TASK)
.WithOne(u => u.USER);
#endregion
base.OnModelCreating(modelBuilder);
}
}
my database entity:
/// <summary>
/// query user
/// </summary>
[Table(@"USER")]
public class USER
{
#region Properties
/// <summary>
/// sequence of user
/// </summary>
/// <value></value>
[Key()]
[Column(@"SEQUSER")]
public virtual long SEQUSER { get; set; }
/// <summary>
/// email of user
/// </summary>
/// <value></value>
[Required]
[StringLength(120)]
[Column(@"EMAIL")]
public virtual string EMAIL { get; set; }
/// <summary>
/// password of user
/// </summary>
/// <value></value>
[Required]
[StringLength(15)]
[Column(@"PASSWORD")]
public virtual string PASSWORD { get; set; }
/// <summary>
/// name of user
/// </summary>
/// <value></value>
[Required]
[StringLength(120)]
[Column(@"NAME")]
public virtual string NAME { get; set; }
/// <summary>
/// date of user was registered
/// </summary>
/// <value></value>
[Column(@"DATEREGISTER")]
public virtual DateTime DATEREGISTER { get; set; }
/// <summary>
/// last acess of user in application
/// </summary>
/// <value></value>
[Column(@"LASTACESS")]
public virtual DateTime LASTACESS { get; set; }
/// <summary>
/// list of task
/// </summary>
/// <value></value>
[InverseProperty("USER")]
public virtual List<TASK> TASK { get; set; }
#endregion
}
Could someone give me a hand at this?