相关疑难解决方法(0)

我想尝试以下工作:

_dbmsParentSections = FactoryTools.Factory.PdfSections
                        .Include(x => x.Children.OrderBy(y => y.Order).ToList())
                        .Include(x => x.Hint).Include(x => x.Fields)
                        .Where(x => x.FormId == FormId && x.Parent == null)
                        .OrderBy(o => o.Order)
                        .ToList();

导致异常的部分是:

.Include(x => x.Children.OrderBy(y => y.Order).ToList())

编辑:

经过进一步观察,

_dbmsParentSections.ForEach(x => x.Children = x.Children.OrderBy(y => y.Order).ToList());

为我完成了这项工作(在初次Factory通话之后没有Children.OrderBy).

这是这里解释的问题的第二步:EF 4.1代码优先:如何加载相关数据(父子孙子)？.在@Slauma的指导下,我使用这种方法成功检索了数据:

var model = DbContext.SitePages
    .Where(p => p.ParentId == null && p.Level == 1)
    .OrderBy(p => p.Order) // ordering parent 
    .ToList();

foreach (var child in model) { // loading children
    DbContext.Entry(child)
        .Collection(t => t.Children)
        .Query()
        .OrderBy(t => t.Order) // ordering children
        .Load();

    foreach (var grand in child.Children) { // loading grandchildren
        DbContext.Entry(grand)
            .Collection(t => t.Children)
            .Query()
            .OrderBy(t => t.Order) // ordering grandchildren 
            .Load();
    }
}

虽然这种方法有效,但它会向数据库发送许多查询,而我正在寻找一种方法,只需一个查询即可完成所有操作.在@Slauma的指导下(在上面链接的答案中解释),我已经将查询更改为:

var model2 = DbContext.SitePages
    .Where(p => p.ParentId …