Question

我想获取所有图层组，并包括（渴望加载）具有特定网址的图层。

这是我的桌子：

 - LayerGroup (id, List<Layer>layers and more...) 
 - Layer(id, url, List<Attribute>attributes and more...) 
 - Attribute (id and more...)

这是我到目前为止所得到的。

var groups = _context.LayerGroups
                    .Where(group => group.IsActive)
                    .Where(g => g.Layers.All(l => l.IsActive == true))
                    .Where(g => g.Layers.All(l => l.Url == "example1"))
                    .Include(g => g.Layers)                     
                    .ThenInclude(layer => layer.Attributes)
                    .Include(group => group.Layers).ThenInclude(layer => layer.SearchEngines)
                    .ToList();

但是，似乎只有在所有层都处于活动状态并且具有URL example1的情况下才能获得组。我希望获取具有正确网址的图层，即使这些组的图层具有其他url：s。

Answer 1

According to this您不能过滤Include和ThenInclude集合，但可以根据Include的条件过滤父对象。如果需要，则可以按以下方式编写查询：

var groups = _context.LayerGroups.Where(group => group.IsActive)
                    .Include(g => g.Layers)
                        .ThenInclude(layer => layer.Attributes)
                    .Include(group => group.Layers)
                        .ThenInclude(layer => layer.SearchEngines)
                    .Where(g => g.Layers.Any(l => l.IsActive == true && l => l.Url == "example1"))
                    .ToList();

实体框架查询：包括在哪里

1 个答案: