[英]LINQ filter list based on property value and filter the properties as well
我的NavigationItem
具有导航属性NavigationItemsPermissions
,其中我具有RoleId
。 作为函数中的输入参数,我具有List<int> roleIds
,其中将有类似{1,3}的内容。
我如何完成我的LINQ
给我回NavigationItem
(s)表示,有NavigationItemsPermissions
一些 RoleId
输入列表中。 请注意 ,此外,我只需要输入列表中带有RoleId
那些NavigationItemsPermissions
。
这是我坚持的地方
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;
}
如果有开发人员列表,则给出一个简单的类比(不是真实数据)
developers: [
{ name: "Hickory", skills: ["c#", "js", "linq"] }
{ name: "Dickory", skills: ["html", "css", "js"] }
{ name: "Dock", skills: ["html", "c#", "oracle"] }
]
和给定的技能list = [ "c#", "linq" ]
,我希望得到以下结果
[{ name: "Hickory", skills: ["c#", "linq"] }
{ name: "Dock", skills: ["c#"] }]
实际数据样本:
感谢您的任何帮助。
在这种情况下,您可以使用contains
public List<NavigationItem> GetNavigationItems(MenuType menuType, List<int> roleIds)
{
var navigationItems = DbContext.NavigationItems.Where(x => x.MenuTypeId == (int) menuType && !x.IsDeleted && roleIds.contains(x.RoleId)));
return navigationItems;
}
这应该给您想要的结果
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“仅需要NavigationItemsPermissions.RoleId在roleIds中的NavigationItemsPermissions” ,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只需要不同的项目,请在ToList()
Distinct()
之前使用Distinct()
。
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());
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