c# – linq对实体无法识别方法

public int count(
        Guid companyId,Expression<Func<T,bool>> isMatch)
    {
        var filters = new Expression<Func<T,bool>>[]{
            x => x.PriceDefinition.CompanyId == companyId,isMatch
        };

        return GetCount(filters);
    }

public virtual int GetCount(
            IEnumerable<Expression<Func<T,bool>>> filters)
        {
            IQueryable<T> _query = ObjectSet;

            if (filters != null)
            {
                foreach (var filter in filters)
                {
                    _query = _query.Where(filter);
                }
            }

           return _query.Count();
        }

使用时：

count(some_guid,x => x.IsMatch(entityId,inviterId,routeId,luggageTypeId));

我得到以下例外：

LINQ to Entities does not recognize the method 'Boolean IsMatch(System.Nullable`1[System.Int64],System.Nullable`1[System.Int64],System.Nullable`1[System.Int64])' method,and this method cannot be translated into a store expression.

这是什么原因？
我该如何解决？