我使用的是efcore3.1.9和官方的mysql提供程序。我在查询ef core时遇到问题。
这是我的密码：

// Entity mapping configuration
    internal class FormGroupConfiguration : EntityTypeConfigurationBase<FormGroup>
    {
        /// <inheritdoc />
        public override void Configure(EntityTypeBuilder<FormGroup> builder)
        {

            builder.Property(v => v.Id) // Guid
                .HasColumnType("varchar(40)");
        }
    }

    // EfRepository is come from a package
    public class FormGroupRepository : EfRepository<FormGroup, Guid>, IFormGroupRepository
    {
        public async Task<FormGroup> GetAsync(Guid id)
        {
            return await ApplyQueryFilter(Context.Set<FormGroup>())
                .SingleOrDefaultAsync(v => v.Id.Equals(id));
        }
    }

    ...

    // package
    public abstract class EfRepository<T, TKey> : IRepository<T, TKey>
        where T : class, IAggregateRoot, Domain.Core.Entities.IEntity<TKey>
    {
        /// <inheritdoc />
        public virtual async Task<T> GetByIdAsync(TKey id, CancellationToken cancellationToken = default)
        {
            return await ApplyQueryFilter(Context.Set<T>())
                .SingleOrDefaultAsync(v => v.Id.Equals(id), cancellationToken);
        }
    }

    ...

    public class SomeService
    {
        public async Task<FormGroup> DoSomeThing(Guid id)
        {
            var form1 = await _formGroupRepository.GetByIdAsync(id); // null
            var form2 = await _formGroupRepository.GetAsync(id); // not null
        }
    }

我对不同的查询结果感到困惑。以下是查询日志：

info: Microsoft.EntityFrameworkCore.Database.Command[20101]
      Executed DbCommand (3ms) [Parameters=[@__id_0='0x258FCACDB709B046944E64C1A7AC1086' (Nullable = false) (Size = 16)], CommandType='Text', CommandTimeout='30']
      SELECT `f`.`Id`, `f`.`ConcurrencyStamp`, `f`.`CreationTime`, `f`.`CreatorId`, `f`.`DeleterId`, `f`.`DeletionTime`, `f`.`IsDeleted`, `f`.`LastModificationTime`, `f`.`LastModifierId`, `f`.`Name`
      FROM `FormGroups` AS `f`
      WHERE (`f`.`IsDeleted` = FALSE) AND (`f`.`Id` = @__id_0)
      LIMIT 2
info: Microsoft.EntityFrameworkCore.Database.Command[20101]
      Executed DbCommand (1ms) [Parameters=[@__id_0='cdca8f25-09b7-46b0-944e-64c1a7ac1086' (Nullable = false) (Size = 40)], CommandType='Text', CommandTimeout='30']
      SELECT `f`.`Id`, `f`.`ConcurrencyStamp`, `f`.`CreationTime`, `f`.`CreatorId`, `f`.`DeleterId`, `f`.`DeletionTime`, `f`.`IsDeleted`, `f`.`LastModificationTime`, `f`.`LastModifierId`, `f`.`Name`
      FROM `FormGroups` AS `f`
      WHERE (`f`.`IsDeleted` = FALSE) AND (`f`.`Id` = @__id_0)
      LIMIT 2

第一个操作的查询参数似乎变成了“binary（16）”，而第二个操作则不是。当我将数据提供程序切换到'pomelo.entityframeworkcore.mysql'3.2.4时，我发现问题消失了。有人能告诉我原因吗？