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我最难将列表(Of Folder)转换为层次结构.

Public Class Folder

Public Property FolderID() As Integer
Public Property Name() As String
Public Property ParentFolderID() As Integer
Public Property Children() as IEnumerable(Of Folder)

End Class

我需要返回填充了Children的List(Of Folder).

我从数据库中的数据构建一个List(Of Folder).

{1,"文件夹1",没有} {2,"文件夹2",1} {3,"文件夹3",2} {4,"文件夹4",3} {5,"文件夹5",没什么}

我无法弄清楚如何以递归方式将子文件夹移动到其父级的Children属性中.

我想用LINQ做这个.

任何帮助是极大的赞赏.

更新

谢谢你的回答,但不是那里.根据你的答案,我想出了几乎可行的.

Dim list = (From folder in folderList Select New Folder() With {
    .FolderID = folder.FolderID, 
    .Name = folder.Name, 
    .ParentFolderID = folder.ParentFolderID, 
    .Children = (From child in folderList 
                 Where child.ParentFolderID = item.FolderID).ToList()}).ToList()

{1, "Root", Nothing}
{2, "Child", 1}
{3, …