ASP.NET MVC5实体框架6得到bool = true和bool = false LINQ

我有一个要过滤的表。value 'include'有一个过滤器，可以是true或false。

我有一个过滤器，有3个选项:true， false， & .

所以，当过滤器为true时，它应该返回include = 'true'的行;当过滤器为'false'时，返回where include = false;当'all'返回时，include = true或false

这是我的代码，这是不工作，但我认为它应该。

private ICollection<AggregationEntityViewModel> getEntities(AggregationPracticeDetailsViewModel apdvm)
{
    bool? filterInclude = Convert.ToBoolean(apdvm.Filter_IncludeValue);
    var a = (from e in _repository.GetAll<Entity>()                         
        where e.include == filterInclude != null ? (bool)filterInclude : (true || false)                     
        select e
     return a;
}

当过滤器设置为"All"或"False"时，它目前返回0行，当设置为"Yes"时返回所有行。

仅供参考，为了清晰起见，我已经提交了许多代码。

请帮…谢谢!

*编辑:我已经显示了所有的代码，所以你可以看到为什么我想保持所有的linq查询。感谢所有提供的解决方案。我看到大多数解决方案都涉及到使用Linq Extension方法。是否有办法在内联linq查询?*

bool? filterInclude = Convert.ToBoolean(apdvm.Filter_IncludeValue);
            var a = (from e in _repository.GetAll<Entity>()
                     from u in e.Users
                     where (e.AuditQuestionGroupId != null ? e.AuditQuestionGroupId : 0) == this.LoggedInEntity.AuditQuestionGroupId
                     && e.BatchNumber != null && e.BatchNumber.StartsWith(apdvm.Filter_BatchNumber == null ? "" : apdvm.Filter_BatchNumber)
                     && e.Name != null && e.Name.ToLower().StartsWith(apdvm.Filter_EntityName.ToLower())
                     && e.EntityState != null && e.EntityState.ToLower().Contains(apdvm.Filter_StateValue == null ? "" : apdvm.Filter_StateValue.ToLower())
                     && u.NIAMembershipId != null && u.NIAMembershipId.Contains(apdvm.Filter_MemberNo == null ? "" : apdvm.Filter_MemberNo)
                     from p in e.PracticeProfiles.DefaultIfEmpty()
                     join ea in _repository.GetAll<EntityAggregate>() on e.EntityId equals ea.EntityId into eas
                     from ea in eas.DefaultIfEmpty()                     
                     where ea.include == filterInclude != null ? (bool)filterInclude : (true || false)
                     group e by new { entity = e, profile = p, ea = ea } into newGroup
                     orderby newGroup.Key.entity.Name
                     select new AggregationEntityViewModel()
                     {
                         Id = newGroup.Key.ea == null ? 0 : newGroup.Key.ea.Id,
                         EntityId = newGroup.Key.entity.EntityId,
                         Include = newGroup.Key.ea == null ? (true || false) : (bool)newGroup.Key.ea.include,
                         BHAddress = newGroup.Key.profile == null || newGroup.Key.profile.soloOffice == null ? false : (bool)newGroup.Key.profile.soloOffice,
                         Incorporated = newGroup.Key.profile == null || newGroup.Key.profile.company == null ? false : (bool)newGroup.Key.profile.company,
                         MajorityOwned = newGroup.Key.profile == null || newGroup.Key.profile.capital == null ? false : (bool)newGroup.Key.profile.capital,
                         MajorityVoting = newGroup.Key.profile == null || newGroup.Key.profile.votingRights == null ? false : (bool)newGroup.Key.profile.votingRights,
                         Name = newGroup.Key.entity.Name,
                         Partnership = newGroup.Key.profile == null || newGroup.Key.profile.partnership == null ? false : (bool)newGroup.Key.profile.partnership,
                         PublicAccountant = newGroup.Key.profile == null || newGroup.Key.profile.publicAccountant == null ? false : (bool)newGroup.Key.profile.publicAccountant,
                         Trust = newGroup.Key.profile == null || newGroup.Key.profile.operatingTrust == null ? false : (bool)newGroup.Key.profile.operatingTrust,
                         TrustDeed = newGroup.Key.profile == null || newGroup.Key.profile.deed == null ? false : (bool)newGroup.Key.profile.deed
                     }).ToList();
            return a;

private ICollection<AggregationEntityViewModel> getEntities(
              AggregationPracticeDetailsViewModel apdvm)
{
    bool? filterInclude = apdvm.Filter_IncludeValue.ConvertToNullable<bool>();
    var a = (from e in _repository.GetAll<Entity>()                         
             where !filterInclude.HasValue || ea.include == filterInclude.Value                     
             select new AggregationEntityViewModel()
             {
                Include = newGroup.Key.ea == null 
                          ? (true || false) 
                          : (bool)newGroup.Key.ea.include,
             }
    return a;
}

public static T? ConvertToNullable<T>(this String s) where T : struct 
{
    try
    {
        return (T?)TypeDescriptor.GetConverter(typeof(T)).ConvertFrom(s);
    }
    catch (Exception)
    {
        return null;
    }
}

var query = from e in _repository.GetAll<Entity>();
if (filterInclude.HasValue)
{
    // when filterInclude is null (it means **ALL**), 
    // do not filter otherwise - check the flag
    query = query.Where(entity => entity.Include == filterInclude.Value);
}
// or one-line:
// query = query.Where(entity => filterInclude == null
//                      || entity.Include == filterInclude.Value);
var a = query.Select(entity => new AggregationEntityViewModel { .... });
return a;

public static Nullable<T> ToNullable<T>(this string s) where T: struct
{
    Nullable<T> result = new Nullable<T>();
    try
    {
        if (!string.IsNullOrEmpty(s) && s.Trim().Length > 0)
        {
            TypeConverter conv = TypeDescriptor.GetConverter(typeof(T));
            result = (T)conv.ConvertFrom(s);
        }
    }
    catch { } 
    return result;
}

var filterInclude = apdvm.Filter_IncludeValue.ToNullable<bool>();

private ICollection<AggregationEntityViewModel> getEntities(AggregationPracticeDetailsViewModel apdvm)
{
    var query = _repository.GetAll<Entity>();
    if(apdvm.Filter_IncludeValue != 'all')
    {
        var value = Convert.ToBoolean(apdvm.Filter_IncludeValue);
        query = query.Where(q => q.include == value)
    }
    return query.Select(q => new AggregationEntityViewModel {...}).ToArray();
}