我有 List
的平坦 ViewModels
。
var initialList = new List<ViewModel>
{
new ViewModel { OuterCaption = "A outer", InnerCaption = "A inner", Caption = "E", Id = 8},
new ViewModel { OuterCaption = "B outer", InnerCaption = "B inner", Caption = "A", Id = 5},
new ViewModel { OuterCaption = "A outer", InnerCaption = "B inner", Caption = "A", Id = 12},
new ViewModel { OuterCaption = "B outer", InnerCaption = "B inner", Caption = "B", Id = 9},
new ViewModel { OuterCaption = "A outer", InnerCaption = "B inner", Caption = "B", Id = 23},
new ViewModel { OuterCaption = "B outer", InnerCaption = "C inner", Caption = "A", Id = 10},
new ViewModel { OuterCaption = "A outer", InnerCaption = "B inner", Caption = "C", Id = 16},
new ViewModel { OuterCaption = "A outer", InnerCaption = "A inner", Caption = "C", Id = 4},
new ViewModel { OuterCaption = "A outer", InnerCaption = "A inner", Caption = "D", Id = 7},
new ViewModel { OuterCaption = "C outer", InnerCaption = "A inner", Caption = "A", Id = 31},
new ViewModel { OuterCaption = "B outer", InnerCaption = "A inner", Caption = "A", Id = 19},
new ViewModel { OuterCaption = "B outer", InnerCaption = "A inner", Caption = "B", Id = 20},
new ViewModel { OuterCaption = "A outer", InnerCaption = "A inner", Caption = "A", Id = 1},
new ViewModel { OuterCaption = "A outer", InnerCaption = "A inner", Caption = "B", Id = 3}
}.OrderBy(vm => vm.OuterCaption).ThenBy(vm => vm.InnerCaption).ThenBy(vm => vm.Caption);
其中每个 ViewModel
如下所示。
class ViewModel
{
public string OuterCaption { get; set; }
public string InnerCaption { get; set; }
public string Caption { get; set; }
public int Id { get; set; }
}
现在我想将 List
按 OuterCaption
和稍后按 InnerCaption
分组。我可以像这样按 List
对 OuterCaption
进行分组。
var list = initialList.GroupBy(vm => vm.OuterCaption).ToList();
像这样在我的 View
中使用它并在我的 GroupBy
中使用 View
。
foreach (var outerGrouping in list)
{
Console.WriteLine(outerGrouping.Key);
Console.WriteLine("~~~~~~~~~~~~~~~~~~");
foreach (var innerGrouping in outerGrouping.GroupBy(vm => vm.InnerCaption))
{
Console.WriteLine(innerGrouping.Key);
foreach (var vm in innerGrouping)
{
Console.WriteLine("Caption: " + vm.Caption + " Id:" + vm.Id);
}
Console.WriteLine("------------------");
}
Console.WriteLine("~~~~~~~~~~~~~~~~~~");
}
但我想在 IGrouping
中创建一个 IGrouping
,而不是在我的 GroupBy
中使用 Linq
(或 View
)。我确实认为我应该为我的 IReadOnlyList<IGrouping<string, IGrouping<string, ViewModel>>>
创建类似 View
(可能是错误的)的东西。我如何通过我的 initialList
实现这一点,以便从我的 Linq
中删除 View
?
答案 0 :(得分:0)
这是有效的。这不完全是我要找的,但它从我的 Linq
中删除了 View
。
var list = initialList
.GroupBy(vm => (vm.OuterCaption, ViewModel: vm))
.GroupBy(group => group.Key.ViewModel.InnerCaption)
.ToList();