LINQ根据属性值过滤列表并过滤属性

Question

我NavigationItem有导航属性NavigationItemsPermissions，我有RoleId。作为函数中的输入参数，我List<int> roleIds将拥有类似 {1, 3} 的内容。

我如何完成我的工作并把输入列表中的一些内容LINQ还给我。另外请注意，我只想要输入列表中包含的内容。NavigationItemNavigationItemsPermissions RoleIdNavigationItemsPermissionsRoleId

这就是我被困的地方

public List<NavigationItem> GetNavigationItems(MenuType menuType, List<int> roleIds)
{
    var navigationItems = DbContext.NavigationItems.Where(x => x.MenuTypeId == (int) menuType && !x.IsDeleted && x.NavigationItemsPermissions.Any(r=>r.RoleId **in roleIds**)));       

    return navigationItems;
}

举个更简单的比喻（不是真实数据），如果有一个开发者列表

developers: [
    { name: "Hickory", skills: ["c#", "js", "linq"] }
    { name: "Dickory", skills: ["html", "css", "js"] }
    { name: "Dock", skills: ["html", "c#", "oracle"] }
]

以及给定的技能列表list = [ "c#", "linq" ]，我想要以下结果

[{ name: "Hickory", skills: ["c#", "linq"] }
{ name: "Dock", skills: ["c#"] }]

真实数据样本：

感谢您的任何帮助。

Answer 1

这应该会给你想要的结果

public List<NavigationItem> GetNavigationItems(MenuType menuType, List<int> roleIds)
{
    var navigationItems = DbContext.NavigationItems
                                        .Where(x => x.MenuTypeId == (int) menuType && 
                                                !x.IsDeleted && 
                                                x.NavigationItemsPermissions.Any(r => roleIds.Contains(r.RoleId)));
    return navigationItems;
}

编辑

如果您“只需要NavigationItemsPermissions，其中NavigationItemsPermissions.RoleId位于roleIds中”，则可以使用此查询

var navigationPermissions = DbContext.NavigationItems
                                    .Where(x => x.MenuTypeId == (int) menuType && 
                                            !x.IsDeleted)
                                    .SelectMany(ni => ni.NavigationItemsPermissions)
                                    .Where(np => roleIds.Contains(np.RoleId))
                                    .ToList();

如果有重复的项目并且您只需要不同的项目，请使用Distinct()before 。ToList()

编辑2

var navigationItems = DbContext.NavigationItems
                                    .Where(x => x.MenuTypeId == (int) menuType && 
                                            !x.IsDeleted && 
                                            x.NavigationItemsPermissions.Any(r => roleIds.Contains(r.RoleId)));     
navigationItems.ForEach(x => x.NavigationItemsPermissions = x.NavigationItemsPermissions.Where(r => roleIds.Contains(r.RoleId)).ToList());