c# - Nested ILookup - Argument ype error -

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consider following object:

class menu{     public int section {get; set;}     public string parent {get; set;}     public string name {get; set;}     public string url {get; set;}     /* more */ }

i getting list of these objects , want group them section , inside each section want group them parent used following structure:

ilookup<int, ilookup<string, menu>> menustructure =           menulist.tolookup(m => m.section, menulist.tolookup(m => m.parent));

but i'm getting error:

cannot implicitly convert type 'system.linq.ilookup<int,mynamespace.menu>' 'system.linq.ilookup<int,system.linq.ilookup<string,mynamespace.menu>>'. explicit conversion exists (are missing cast?)

what doing wrong?


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