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我有一个List平的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。

class ViewModel
{
    public string OuterCaption { get; set; }
    public string InnerCaption { get; set; }
    public string Caption { get; set; }
    public int Id { get; set; }

}

现在我想按 分组List，OuterCaption然后按InnerCaption。我可以这样分组List。OuterCaption

var list = initialList.GroupBy(vm => vm.OuterCaption).ToList();

并在我View这样使用它并GroupBy在我的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 a 中创建一个IGrouping而IGrouping不是在我GroupBy的. 我确实认为我应该为我的. 我如何使用 my 实现这一点，以便我可以从我的中删除？LinqViewIReadOnlyList<IGrouping<string, IGrouping<string, ViewModel>>>ViewinitialListLinqView

这是示例代码：https ://dotnetfiddle.net/hP2kxO

4

1 回答 1

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这是有效的。这不是我正在寻找的东西，但它Linq从我的View.

var list = initialList
    .GroupBy(vm => (vm.OuterCaption, ViewModel: vm))
    .GroupBy(group => group.Key.ViewModel.InnerCaption)
    .ToList();
于 2021-05-28T11:31:53.007 回答