使用Or操作数组合一些lambda表达式

我想创建一个动态表达式，该表达式将由未知数量的Or条件生成：

    IQueryable<Entity> entities = Repository<Entity>.Load();
    Expression<Func<Entity, bool>> wholeFilter;
    foreach(condition in Conditions)
    {           
      Expression<Func<Entity, bool>> filter = e => e.something1 == condition.First && e.something2 == condition.Second
      wholeFilter = wholeFilter.Or(filter)
    }
    return entities.Where(wholeFilter);

我试图实现Or扩展，但无法想出一个合乎逻辑的方法。

此外，我还在玩PredicateBuilder，并写了一些类似的东西：

var predicate = PredicateBuilder.False<Entity>();

下面的代码在我的循环中：

predicate = predicate.Or(filter);

然而，我意识到这只是And的条件加在一起，而不是Or的条件。。。。

知道如何生成组合表达式吗
关于

编辑：
我写的原始代码：

public IQueryable<IEntity> Find(IEntityType entityType, List<AdaptiveObjectModelSpecification> queryObjecs)
{
    if (entityType == null)
        return null;
    var predicate = PredicateBuilder.False<IEntity>();
    var entities = Repository<IEntity>.Find(p => p.EntityType == entityType);
    if (queryObjecs != null)
    {
        foreach (var queryObject in queryObjecs)
        {
            if (entityType.PropertyTypes.Count(p => p.PropertyName == queryObject.PropertyType.PropertyName) == 0)
                throw new MissingFieldException(String.Format("Column {0} not found.", queryObject.PropertyType.PropertyName));
            predicate = predicate.Or(e => e.Properties.Any(p => p.Value == queryObject.SearchValue && p.PropertyType.PropertyName == queryObject.PropertyType.PropertyName));
        }
        entities = entities.Where(predicate);            
    }
    return entities;
}

生成的实体。当queryObjects有两个元素=时，Expression.ToString（）

{value(NHibernate.Linq.NhQueryable`1[Azarakhsh.Domain.Core.AdaptiveObjectModel.Interface.IEntity])
.Where(p => (p.EntityType == value(Azarakhsh.Domain.Core.AdaptiveObjectModel.Service.AdaptiveObjectModelRepositoryService+<>c__DisplayClassd).entityType))
// The line below is generated by PredicateBuilder 
.Where(
Param_0 => ((False
OrElse 
Invoke(e => e.Properties.Any(p => ((p.Value == value(Azarakhsh.Domain.Core.AdaptiveObjectModel.Service.AdaptiveObjectModelRepositoryService+<>c__DisplayClass10).queryObject.SearchValue) AndAlso (p.PropertyType.PropertyName == value(Azarakhsh.Domain.Core.AdaptiveObjectModel.Service.AdaptiveObjectModelRepositoryService+<>c__DisplayClass10).queryObject.PropertyType.PropertyName))), Param_0)) 
OrElse 
Invoke(e => e.Properties.Any(p => ((p.Value == value(Azarakhsh.Domain.Core.AdaptiveObjectModel.Service.AdaptiveObjectModelRepositoryService+<>c__DisplayClass10).queryObject.SearchValue) AndAlso (p.PropertyType.PropertyName == value(Azarakhsh.Domain.Core.AdaptiveObjectModel.Service.AdaptiveObjectModelRepositoryService+<>c__DisplayClass10).queryObject.PropertyType.PropertyName))), Param_0)))}