How to convert from Expression> predicate into Expression>

Question

I've inherited a c# winforms application developed as single user. It uses EF 6 DB First, AutoMapper 4.2.1, Generic Repository and Uow . When using local database the application behaves well enough but when using remote database (vpn connection to server) the application is very slow especially due to some calls which uses AutoMapper. This issue is also described in the following question : [https://stackoverflow.com/questions/66706496/entity-framework-6-generic-repository-with-automapper-slow-performance-when-runn][1]

As [2]: https://stackoverflow.com/users/1663001/davidg suggested the reason for why the application is running slow is because I'm downloading the entire list of users from the database and filtering in memory.

public List<T1> Find(Expression<Func<T1, bool>> predicate)
{
    // Note this is still an IQueryable<T> so nothing is executed against the database yet
    var query = _dbContext.Set<T>()
        .Where(q => !q.IsDeleted)
        .Where(predicate);

    return AutoMapperConfiguration.GetMapperConfiguration()
        .Map<List<T1>>(query);
}

The main issue here is that I cannot apply predicate in the query where clause because it is expected a predicate of type Expression<Func<T1, bool>> where T1 is my PrjUser_ViewModel class and T1 is PrjUser Entity class.

So I'm looking for a way to convert Expression<Func<T1, bool>> predicate into Expression<Func<T, bool>> predicate in order to improve the performance and reduce the time spent in each call of the Find method. Any answers will be highly appreciated.

UPDATE, This is the Automapper mapper configuration class

public static class AutoMapperConfiguration
    {
        private static IMapper mapperConfiguration;
        
        public static IMapper GetMapperConfiguration()
        {
            return mapperConfiguration;
        }

        public static void SetMapperConfiguration(IMapper value)
        {
            mapperConfiguration = value;
        }

        public static void Configure()
        {
            var config = new MapperConfiguration(cfg =>
            cfg.AddProfile(new MapperProfile()));

            SetMapperConfiguration(config.CreateMapper());
        }
    }
}

Edit I'm adding the entire configuration of Automapper inside my project :

AutoMapperConfiguration.cs

using AutoMapper;



    public static class AutoMapperConfiguration
    {
        private static IMapper mapperConfiguration;
        
        public static IMapper GetMapperConfiguration()
        {
            return mapperConfiguration;
        }

        public static void SetMapperConfiguration(IMapper value)
        {
            mapperConfiguration = value;
        }

        public static void Configure()
        {
            var config = new MapperConfiguration(cfg =>
            cfg.AddProfile(new MapperProfile()));

            SetMapperConfiguration(config.CreateMapper());
        }
    }

IgnoreVirtualExtensions.cs

public static IMappingExpression<TSource, TDestination>
               IgnoreAllVirtual<TSource, TDestination>(
                   this IMappingExpression<TSource, TDestination> expression)
        {
            var desType = typeof(TDestination);
            foreach (var property in desType.GetProperties().Where(p =>
                                     p.GetGetMethod().IsVirtual && !p.GetGetMethod().IsFinal))
            {
                expression.ForMember(property.Name, opt => opt.Ignore());
            }

            return expression;
        }
    }

MapperProfile.cs

internal class MapperProfile : AutoMapper.Profile
    {
        protected override void Configure()
        {

.......................
            CreateMap<PrjUser, PrjUser_ViewModel>().ForMember(dest => dest.ConfigSets_LockedBy, opt => opt.MapFrom(src => src.ConfigSets1))
                                                    .ForMember(dest => dest.ConfigSet_Attribute_LockedBy, opt => opt.MapFrom(src => src.ConfigSet_Attribute1))
                                                    .ForMember(dest => dest.ConfigSet_DataType_Mapping_LockedBy, opt => opt.MapFrom(src => src.ConfigSet_DataType_Mapping1))
                                                    .ForMember(dest => dest.ConfigSet_IODPEntity_Mapping_LockedBy, opt => opt.MapFrom(src => src.ConfigSet_IODPEntity_Mapping1))
                                                    .ForMember(dest => dest.DataTypes_LockedBy, opt => opt.MapFrom(src => src.DataTypes1))
                                                    .ForMember(dest => dest.Features_LockedBy, opt => opt.MapFrom(src => src.Features1))
                                                    .ForMember(dest => dest.GeneralParameters_LockedBy, opt => opt.MapFrom(src => src.GeneralParameters1))
                                                    .ForMember(dest => dest.HwVariants_LockedBy, opt => opt.MapFrom(src => src.HwVariants1))
                                                    .ForMember(dest => dest.HwVariantConfigurationMappings_LockedBy, opt => opt.MapFrom(src => src.HwVariantConfigurationMappings1))
                                                    .ForMember(dest => dest.IODPEntities_LockedBy, opt => opt.MapFrom(src => src.IODPEntities1))
                                                    .ForMember(dest => dest.MainFunctions_LockedBy, opt => opt.MapFrom(src => src.MainFunctions1))
                                                    .ForMember(dest => dest.MainFunction_Attribute_LockedBy, opt => opt.MapFrom(src => src.MainFunction_Attribute1))
                                                    .ForMember(dest => dest.Modules_LockedBy, opt => opt.MapFrom(src => src.Modules1))
                                                    .ForMember(dest => dest.Module_Feature_Mapping_LockedBy, opt => opt.MapFrom(src => src.Module_Feature_Mapping1))
                                                    .ForMember(dest => dest.ModuleEntities_LockedBy, opt => opt.MapFrom(src => src.ModuleEntities1))
                                                    .ForMember(dest => dest.ModuleEntity_Association_LockedBy, opt => opt.MapFrom(src => src.ModuleEntity_Association1))
                                                    .ForMember(dest => dest.ModuleEntity_Attribute_LockedBy, opt => opt.MapFrom(src => src.ModuleEntity_Attribute1))
                                                    .ForMember(dest => dest.ModuleEntity_DataType_Mapping_LockedBy, opt => opt.MapFrom(src => src.ModuleEntity_DataType_Mapping1))
                                                    .ForMember(dest => dest.ModuleEntity_HwVariant_Mapping_LockedBy, opt => opt.MapFrom(src => src.ModuleEntity_HwVariant_Mapping1))
                                                    .ForMember(dest => dest.ModuleEntity_IODPEntity_Mapping_LockedBy, opt => opt.MapFrom(src => src.ModuleEntity_IODPEntity_Mapping1))
                                                    .ForMember(dest => dest.ModuleEntityHwVariant_Attribute_LockedBy, opt => opt.MapFrom(src => src.ModuleEntityHwVariant_Attribute1))
                                                    .ForMember(dest => dest.ModuleEntityHwVariant_ConfigSet_Mapping_LockedBy, opt => opt.MapFrom(src => src.ModuleEntityHwVariant_ConfigSet_Mapping1))
                                                    .ForMember(dest => dest.ModuleEntityHwVariant_MainFunction_Mapping_LockedBy, opt => opt.MapFrom(src => src.ModuleEntityHwVariant_MainFunction_Mapping1))
                                                    .ForMember(dest => dest.ModuleEntityHwVariant_Signal_Mapping_LockedBy, opt => opt.MapFrom(src => src.ModuleEntityHwVariant_Signal_Mapping1))
                                                    .ForMember(dest => dest.ModuleEntityHwVariantSignal_Attribute_LockedBy, opt => opt.MapFrom(src => src.ModuleEntityHwVariantSignal_Attribute1))
                                                    .ForMember(dest => dest.ModuleEntityHwVariantSignal_Plausibility_Mapping_LockedBy, opt => opt.MapFrom(src => src.ModuleEntityHwVariantSignal_Plausibility_Mapping1))
                                                    .ForMember(dest => dest.ModuleProperty_Attribute_LockedBy, opt => opt.MapFrom(src => src.ModuleProperty_Attribute1))
                                                    .ForMember(dest => dest.Plausibilities_LockedBy, opt => opt.MapFrom(src => src.Plausibilities1))
                                                    .ForMember(dest => dest.Plausibility_Attribute_LockedBy, opt => opt.MapFrom(src => src.Plausibility_Attribute1))
                                                    .ForMember(dest => dest.Preferences_LockedBy, opt => opt.MapFrom(src => src.Preferences1))
                                                    .ForMember(dest => dest.Signal_Attribute_LockedBy, opt => opt.MapFrom(src => src.Signal_Attribute1))
                                                    .ForMember(dest => dest.Signal_DataType_Mapping_LockedBy, opt => opt.MapFrom(src => src.Signal_DataType_Mapping1))
                                                    .ForMember(dest => dest.Signal_IODPEntity_Mapping_LockedBy, opt => opt.MapFrom(src => src.Signal_IODPEntity_Mapping1))
                                                    .ForMember(dest => dest.Signal_ModuleEntity_Mapping_LockedBy, opt => opt.MapFrom(src => src.Signal_ModuleEntity_Mapping1))
                                                    .ForMember(dest => dest.Signals_LockedBy, opt => opt.MapFrom(src => src.Signals1))
                                                    .ForMember(dest => dest.Types_LockedBy, opt => opt.MapFrom(src => src.Types1))
                                                    .ForMember(dest => dest.ValidValues_LockedBy, opt => opt.MapFrom(src => src.ValidValues1));
            CreateMap<PrjUser, PrjUser_ViewModel>().ReverseMap().ForMember(dest => dest.ConfigSet_Attribute1, opt => opt.MapFrom(src => src.ConfigSets_LockedBy))
                                                    .ForMember(dest => dest.ConfigSet_DataType_Mapping1, opt => opt.MapFrom(src => src.ConfigSet_Attribute_LockedBy))
                                                    .ForMember(dest => dest.ConfigSet_IODPEntity_Mapping1, opt => opt.MapFrom(src => src.ConfigSet_DataType_Mapping_LockedBy))
                                                    .ForMember(dest => dest.DataTypes1, opt => opt.MapFrom(src => src.ConfigSet_IODPEntity_Mapping_LockedBy))
                                                    .ForMember(dest => dest.Features1, opt => opt.MapFrom(src => src.DataTypes_LockedBy))
                                                    .ForMember(dest => dest.GeneralParameters1, opt => opt.MapFrom(src => src.Features_LockedBy))
                                                    .ForMember(dest => dest.HwVariants1, opt => opt.MapFrom(src => src.GeneralParameters_LockedBy))
                                                    .ForMember(dest => dest.HwVariantConfigurationMappings1, opt => opt.MapFrom(src => src.HwVariantConfigurationMappings_LockedBy))
                                                    .ForMember(dest => dest.IODPEntities1, opt => opt.MapFrom(src => src.IODPEntities_LockedBy))
                                                    .ForMember(dest => dest.MainFunctions1, opt => opt.MapFrom(src => src.MainFunctions_LockedBy))
                                                    .ForMember(dest => dest.MainFunction_Attribute1, opt => opt.MapFrom(src => src.MainFunction_Attribute_LockedBy))
                                                    .ForMember(dest => dest.Modules1, opt => opt.MapFrom(src => src.Modules_LockedBy))
                                                    .ForMember(dest => dest.Module_Feature_Mapping1, opt => opt.MapFrom(src => src.Module_Feature_Mapping_LockedBy))
                                                    .ForMember(dest => dest.ModuleEntities1, opt => opt.MapFrom(src => src.ModuleEntities_LockedBy))
                                                    .ForMember(dest => dest.ModuleEntity_Association1, opt => opt.MapFrom(src => src.ModuleEntity_Association_LockedBy))
                                                    .ForMember(dest => dest.ModuleEntity_Attribute1, opt => opt.MapFrom(src => src.ModuleEntity_Attribute_LockedBy))
                                                    .ForMember(dest => dest.ModuleEntity_DataType_Mapping1, opt => opt.MapFrom(src => src.ModuleEntity_DataType_Mapping_LockedBy))
                                                    .ForMember(dest => dest.ModuleEntity_HwVariant_Mapping1, opt => opt.MapFrom(src => src.ModuleEntity_HwVariant_Mapping_LockedBy))
                                                    .ForMember(dest => dest.ModuleEntity_IODPEntity_Mapping1, opt => opt.MapFrom(src => src.ModuleEntity_IODPEntity_Mapping_LockedBy))
                                                    .ForMember(dest => dest.ModuleEntityHwVariant_Attribute1, opt => opt.MapFrom(src => src.ModuleEntityHwVariant_Attribute_LockedBy))
                                                    .ForMember(dest => dest.ModuleEntityHwVariant_ConfigSet_Mapping1, opt => opt.MapFrom(src => src.ModuleEntityHwVariant_ConfigSet_Mapping_LockedBy))
                                                    .ForMember(dest => dest.ModuleEntityHwVariant_MainFunction_Mapping1, opt => opt.MapFrom(src => src.ModuleEntityHwVariant_MainFunction_Mapping_LockedBy))
                                                    .ForMember(dest => dest.ModuleEntityHwVariant_Signal_Mapping1, opt => opt.MapFrom(src => src.ModuleEntityHwVariant_Signal_Mapping_LockedBy))
                                                    .ForMember(dest => dest.ModuleEntityHwVariantSignal_Attribute1, opt => opt.MapFrom(src => src.ModuleEntityHwVariantSignal_Attribute_LockedBy))
                                                    .ForMember(dest => dest.ModuleEntityHwVariantSignal_Plausibility_Mapping1, opt => opt.MapFrom(src => src.ModuleEntityHwVariantSignal_Plausibility_Mapping_LockedBy))
                                                    .ForMember(dest => dest.ModuleProperty_Attribute1, opt => opt.MapFrom(src => src.ModuleProperty_Attribute_LockedBy))
                                                    .ForMember(dest => dest.Plausibilities1, opt => opt.MapFrom(src => src.Plausibilities_LockedBy))
                                                    .ForMember(dest => dest.Plausibility_Attribute1, opt => opt.MapFrom(src => src.Plausibility_Attribute_LockedBy))
                                                    .ForMember(dest => dest.Preferences1, opt => opt.MapFrom(src => src.Preferences_LockedBy))
                                                    .ForMember(dest => dest.Signal_Attribute1, opt => opt.MapFrom(src => src.Signal_Attribute_LockedBy))
                                                    .ForMember(dest => dest.Signal_DataType_Mapping1, opt => opt.MapFrom(src => src.Signal_DataType_Mapping_LockedBy))
                                                    .ForMember(dest => dest.Signal_IODPEntity_Mapping1, opt => opt.MapFrom(src => src.Signal_IODPEntity_Mapping_LockedBy))
                                                    .ForMember(dest => dest.Signal_ModuleEntity_Mapping1, opt => opt.MapFrom(src => src.Signal_ModuleEntity_Mapping_LockedBy))
                                                    .ForMember(dest => dest.Signals1, opt => opt.MapFrom(src => src.Signals_LockedBy))
                                                    .ForMember(dest => dest.Types1, opt => opt.MapFrom(src => src.Types_LockedBy))
                                                    .ForMember(dest => dest.ValidValues1, opt => opt.MapFrom(src => src.ValidValues_LockedBy));      

..................................   
        }
    }

and PrjUsers_ViewModel

public class PrjUser_ViewModel : IEntity
{
    public PrjUser_ViewModel()
    {
        this.ConfigSets = new HashSet<ConfigSet_ViewModel>();
        this.ConfigSet_Attribute = new HashSet<ConfigSet_Attribute_ViewModel>();
        this.ConfigSet_DataType_Mapping = new HashSet<ConfigSet_DataType_Mapping_ViewModel>();
        this.ConfigSet_IODPEntity_Mapping = new HashSet<ConfigSet_IODPEntity_Mapping_ViewModel>();
        this.DataTypes = new HashSet<DataType_ViewModel>();
        this.Features = new HashSet<Feature_ViewModel>();
        this.GeneralParameters = new HashSet<GeneralParameter_ViewModel>();
        this.HwVariants = new HashSet<HwVariant_ViewModel>();
        this.HwVariants_LockedBy = new HashSet<HwVariant_ViewModel>();
        this.IODPEntities = new HashSet<IODPEntity_ViewModel>();
        this.MainFunctions = new HashSet<MainFunction_ViewModel>();
        this.MainFunction_Attribute = new HashSet<MainFunction_Attribute_ViewModel>();
        this.Modules = new HashSet<Module_ViewModel>();
        this.Module_Feature_Mapping = new HashSet<Module_Feature_Mapping_ViewModel>();
        this.ModuleEntities = new HashSet<ModuleEntity_ViewModel>();
        this.ModuleEntity_Association = new HashSet<ModuleEntity_Association_ViewModel>();
        this.ModuleEntity_Attribute = new HashSet<ModuleEntity_Attribute_ViewModel>();
        this.ModuleEntity_HwVariant_Mapping = new HashSet<ModuleEntity_HwVariant_Mapping_ViewModel>();
        this.ModuleEntity_DataType_Mapping = new HashSet<ModuleEntity_DataType_Mapping_ViewModel>();
        this.ModuleEntity_IODPEntity_Mapping = new HashSet<ModuleEntity_IODPEntity_Mapping_ViewModel>();
        this.ModuleEntityHwVariant_Attribute = new HashSet<ModuleEntityHwVariant_Attribute_ViewModel>();
        this.ModuleEntityHwVariant_ConfigSet_Mapping = new HashSet<ModuleEntityHwVariant_ConfigSet_Mapping_ViewModel>();
        this.ModuleEntityHwVariant_MainFunction_Mapping = new HashSet<ModuleEntityHwVariant_MainFunction_Mapping_ViewModel>();
        this.ModuleEntityHwVariant_Signal_Mapping = new HashSet<ModuleEntityHwVariant_Signal_Mapping_ViewModel>();
        this.ModuleEntityHwVariantSignal_Attribute = new HashSet<ModuleEntityHwVariantSignal_Attribute_ViewModel>();
        this.ModuleEntityHwVariantSignal_Plausibility_Mapping = new HashSet<ModuleEntityHwVariantSignal_Plausibility_Mapping_ViewModel>();
        this.ModuleProperty_Attribute = new HashSet<ModuleProperty_Attribute_ViewModel>();
        this.Plausibilities = new HashSet<Plausibility_ViewModel>();
        this.Plausibility_Attribute = new HashSet<Plausibility_Attribute_ViewModel>();
        this.Preferences = new HashSet<Preferences_ViewModel>();
        this.Signal_Attribute = new HashSet<Signal_Attribute_ViewModel>();
        this.Signal_DataType_Mapping = new HashSet<Signal_DataType_Mapping_ViewModel>();
        this.Signal_IODPEntity_Mapping = new HashSet<Signal_IODPEntity_Mapping_ViewModel>();
        this.Signal_ModuleEntity_Mapping = new HashSet<Signal_ModuleEntity_Mapping_ViewModel>();
        this.Signals = new HashSet<Signal_ViewModel>();
        this.Types = new HashSet<Type_ViewModel>();
        this.ValidValues = new HashSet<ValidValue_ViewModel>();
        this.ConfigSets_LockedBy = new HashSet<ConfigSet_ViewModel>();
        this.ConfigSet_Attribute_LockedBy = new HashSet<ConfigSet_Attribute_ViewModel>();
        this.ConfigSet_DataType_Mapping_LockedBy = new HashSet<ConfigSet_DataType_Mapping_ViewModel>();
        this.ConfigSet_IODPEntity_Mapping_LockedBy = new HashSet<ConfigSet_IODPEntity_Mapping_ViewModel>();
        this.DataTypes_LockedBy = new HashSet<DataType_ViewModel>();
        this.Features_LockedBy = new HashSet<Feature_ViewModel>();
        this.GeneralParameters_LockedBy = new HashSet<GeneralParameter_ViewModel>();
        this.HwVariantConfigurationMappings_LockedBy = new HashSet<HwVariantConfigurationMapping_ViewModel>();
        this.IODPEntities_LockedBy = new HashSet<IODPEntity_ViewModel>();
        this.MainFunctions_LockedBy = new HashSet<MainFunction_ViewModel>();
        this.MainFunction_Attribute_LockedBy = new HashSet<MainFunction_Attribute_ViewModel>();
        this.Modules_LockedBy = new HashSet<Module_ViewModel>();
        this.Module_Feature_Mapping_LockedBy = new HashSet<Module_Feature_Mapping_ViewModel>();
        this.ModuleEntities_LockedBy = new HashSet<ModuleEntity_ViewModel>();
        this.ModuleEntity_Association_LockedBy = new HashSet<ModuleEntity_Association_ViewModel>();
        this.ModuleEntity_Attribute_LockedBy = new HashSet<ModuleEntity_Attribute_ViewModel>();
        this.ModuleEntity_DataType_Mapping_LockedBy = new HashSet<ModuleEntity_DataType_Mapping_ViewModel>();
        this.ModuleEntity_HwVariant_Mapping_LockedBy = new HashSet<ModuleEntity_HwVariant_Mapping_ViewModel>();
        this.ModuleEntity_IODPEntity_Mapping_LockedBy = new HashSet<ModuleEntity_IODPEntity_Mapping_ViewModel>();
        this.ModuleEntityHwVariant_Attribute_LockedBy = new HashSet<ModuleEntityHwVariant_Attribute_ViewModel>();
        this.ModuleEntityHwVariant_ConfigSet_Mapping_LockedBy = new HashSet<ModuleEntityHwVariant_ConfigSet_Mapping_ViewModel>();
        this.ModuleEntityHwVariant_MainFunction_Mapping_LockedBy = new HashSet<ModuleEntityHwVariant_MainFunction_Mapping_ViewModel>();
        this.ModuleEntityHwVariant_Signal_Mapping_LockedBy = new HashSet<ModuleEntityHwVariant_Signal_Mapping_ViewModel>();
        this.ModuleEntityHwVariantSignal_Attribute_LockedBy = new HashSet<ModuleEntityHwVariantSignal_Attribute_ViewModel>();
        this.ModuleEntityHwVariantSignal_Plausibility_Mapping_LockedBy = new HashSet<ModuleEntityHwVariantSignal_Plausibility_Mapping_ViewModel>();
        this.ModuleProperty_Attribute_LockedBy = new HashSet<ModuleProperty_Attribute_ViewModel>();
        this.Plausibilities_LockedBy = new HashSet<Plausibility_ViewModel>();
        this.Plausibility_Attribute_LockedBy = new HashSet<Plausibility_Attribute_ViewModel>();
        this.Preferences_LockedBy = new HashSet<Preferences_ViewModel>();
        this.Signal_Attribute_LockedBy = new HashSet<Signal_Attribute_ViewModel>();
        this.Signal_DataType_Mapping_LockedBy = new HashSet<Signal_DataType_Mapping_ViewModel>();
        this.Signal_IODPEntity_Mapping_LockedBy = new HashSet<Signal_IODPEntity_Mapping_ViewModel>();
        this.Signal_ModuleEntity_Mapping_LockedBy = new HashSet<Signal_ModuleEntity_Mapping_ViewModel>();
        this.Signals_LockedBy = new HashSet<Signal_ViewModel>();
        this.Types_LockedBy = new HashSet<Type_ViewModel>();
        this.ValidValues_LockedBy = new HashSet<ValidValue_ViewModel>();
    }

    public int Id { get; set; }
    public string Name { get; set; }
    public string FullName { get; set; }
    public bool IsDeleted { get; set; }
    public DateTime ModificationDate { get; set; }

    public virtual ICollection<ConfigSet_ViewModel> ConfigSets { get; set; }
    public virtual ICollection<ConfigSet_Attribute_ViewModel> ConfigSet_Attribute { get; set; }
    public virtual ICollection<ConfigSet_DataType_Mapping_ViewModel> ConfigSet_DataType_Mapping { get; set; }
    public virtual ICollection<ConfigSet_IODPEntity_Mapping_ViewModel> ConfigSet_IODPEntity_Mapping { get; set; }
    public virtual ICollection<DataType_ViewModel> DataTypes { get; set; }
    public virtual ICollection<Feature_ViewModel> Features { get; set; }
    public virtual ICollection<HwVariant_ViewModel> HwVariants { get; set; }
    public virtual ICollection<MainFunction_ViewModel> MainFunctions { get; set; }
    public virtual ICollection<MainFunction_Attribute_ViewModel> MainFunction_Attribute { get; set; }
    public virtual ICollection<Module_ViewModel> Modules { get; set; }
    public virtual ICollection<Module_Feature_Mapping_ViewModel> Module_Feature_Mapping { get; set; }
    public virtual ICollection<ModuleEntity_ViewModel> ModuleEntities { get; set; }
    public virtual ICollection<ModuleEntity_Association_ViewModel> ModuleEntity_Association { get; set; }
    public virtual ICollection<ModuleEntity_Attribute_ViewModel> ModuleEntity_Attribute { get; set; }
    public virtual ICollection<ModuleEntity_DataType_Mapping_ViewModel> ModuleEntity_DataType_Mapping { get; set; }
    public virtual ICollection<ModuleEntity_HwVariant_Mapping_ViewModel> ModuleEntity_HwVariant_Mapping { get; set; }
    public virtual ICollection<ModuleEntityHwVariant_Attribute_ViewModel> ModuleEntityHwVariant_Attribute { get; set; }
    public virtual ICollection<ModuleEntityHwVariant_ConfigSet_Mapping_ViewModel> ModuleEntityHwVariant_ConfigSet_Mapping { get; set; }
    public virtual ICollection<ModuleEntityHwVariant_MainFunction_Mapping_ViewModel> ModuleEntityHwVariant_MainFunction_Mapping { get; set; }
    public virtual ICollection<ModuleEntityHwVariant_Signal_Mapping_ViewModel> ModuleEntityHwVariant_Signal_Mapping { get; set; }
    public virtual ICollection<ModuleEntityHwVariantSignal_Attribute_ViewModel> ModuleEntityHwVariantSignal_Attribute { get; set; }
    public virtual ICollection<ModuleEntityHwVariantSignal_Plausibility_Mapping_ViewModel> ModuleEntityHwVariantSignal_Plausibility_Mapping { get; set; }
    public virtual ICollection<ModuleProperty_Attribute_ViewModel> ModuleProperty_Attribute { get; set; }
    public virtual ICollection<Plausibility_ViewModel> Plausibilities { get; set; }
    public virtual ICollection<Plausibility_Attribute_ViewModel> Plausibility_Attribute { get; set; }
    public virtual ICollection<Signal_Attribute_ViewModel> Signal_Attribute { get; set; }
    public virtual ICollection<Signal_DataType_Mapping_ViewModel> Signal_DataType_Mapping { get; set; }
    public virtual ICollection<Signal_ModuleEntity_Mapping_ViewModel> Signal_ModuleEntity_Mapping { get; set; }
    public virtual ICollection<Signal_ViewModel> Signals { get; set; }
    public virtual ICollection<Type_ViewModel> Types { get; set; }
    public virtual ICollection<GeneralParameter_ViewModel> GeneralParameters { get; set; }
    public virtual ICollection<Preferences_ViewModel> Preferences { get; set; }
    public virtual ICollection<IODPEntity_ViewModel> IODPEntities { get; set; }
    public virtual ICollection<ModuleEntity_IODPEntity_Mapping_ViewModel> ModuleEntity_IODPEntity_Mapping { get; set; }
    public virtual ICollection<Signal_IODPEntity_Mapping_ViewModel> Signal_IODPEntity_Mapping { get; set; }
    public virtual ICollection<ValidValue_ViewModel> ValidValues { get; set; }

    public virtual ICollection<ConfigSet_ViewModel> ConfigSets_LockedBy { get; set; }
    public virtual ICollection<ConfigSet_Attribute_ViewModel> ConfigSet_Attribute_LockedBy { get; set; }
    public virtual ICollection<ConfigSet_DataType_Mapping_ViewModel> ConfigSet_DataType_Mapping_LockedBy { get; set; }
    public virtual ICollection<ConfigSet_IODPEntity_Mapping_ViewModel> ConfigSet_IODPEntity_Mapping_LockedBy { get; set; }
    public virtual ICollection<DataType_ViewModel> DataTypes_LockedBy { get; set; }
    public virtual ICollection<Feature_ViewModel> Features_LockedBy { get; set; }
    public virtual ICollection<GeneralParameter_ViewModel> GeneralParameters_LockedBy { get; set; }
    public virtual ICollection<HwVariant_ViewModel> HwVariants_LockedBy { get; set; }
    public virtual ICollection<HwVariantConfigurationMapping_ViewModel> HwVariantConfigurationMappings_LockedBy { get; set; }
    public virtual ICollection<IODPEntity_ViewModel> IODPEntities_LockedBy { get; set; }

................

}

Answer 1

You are using a quite old AutoMapper version, but the principle is similar with the latest versions (just the syntax may differ) - instead of Map which works client side you use AutoMapper Projection (in the version you use it is achieved with using ProjectTo extension method), which is basically generating Select operator transforming T to T1, but still keeping it IQueryable (the result is IQueryable<T1>), hence you could apply additional LINQ operators, including Where with Expression<Func<T1, bool>>.

So what you need is adding

using AutoMapper.QueryableExtensions;

and then, assuming your custom AutoMapperConfiguration.GetMapperConfiguration() method returns IMapper instance (due to Map method used in the posted code, so you'd better rename it to GetMapper to represent what it is returning), something like this (of course you can remove variables and just use return, I'm adding them for clarity):

var mapper = AutoMapperConfiguration.GetMapperConfiguration();
var query = _dbContext.Set<T>()
    // Here you have IQueryable<T>   
    .Where(q => !q.IsDeleted)
    .ProjectTo<T1>(mapper.ConfigurationProvider) // <-- note the usage of ConfigurationProvider property
    // Now you have IQueryable<T1>
    .Where(predicate);
var result = query.ToList();

And just in case the GetMapperConfiguration() returns MapperConfiguration instance (unlikely), pass it directly to the ProjectTo method

.ProjectTo<T1>(AutoMapperConfiguration.GetMapperConfiguration())

---

Regarding the update. Now when the original compilation issue is solved, you are experiencing Circular reference causing stack overflow with Automapper issue. Which means your view model classes contains circular refences, like ICollction<Child> Parent.Childen and Parent Child.Parent properties. The newer versions of the AutoMapper have different control over this issue, in your version you should either remove such back references from child to parent, or Ignore them in the map, or use MaxDepth(1) option when creating maps, e.g.

CreateMap<Parent, ParentViewModel>().MaxDepth(1);
CreateMap<Child, ChildViewModel>().MaxDepth(1);