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asp.netdatasettelerikiqueryablehierarchical

IQueryable into a hierarchy

I currently have an IQueryable of Questions. In my Question object I have and "id" and a "parentId" which can be used to create a hierarchy. Currently, I bind a RadTreeView to the IQueryable of Questions and the RadTreeView takes care of creating the hierarchy because I define the dataId and dataParentId for the TreeView in the markup. I am now in need of actually having the data sorted into a hierarchy PRIOR to passing it off to my RadTreeView. How can I do this?

Solution

  • You could add a numeric field to the table, and populate it by recursively walking the tree and filling the numeric field with an incrementing value.

    ParentID   ID      Sequence
1          7       1
1          4       2
1          9       3
2          6       4
2          5       5
2          3       6

    ..etc.