c# - Group and Filter Collection by another Collection in LINQ -


I have a large set of data in this form: 

  public class permission {Public string url {get; Set; } Public string user {get; Set; } Public string permission level {get; Set; }}   
 and  list & lt; String & gt; As is a second collection. SiteCollections . Sample data:  
  http: // domain / project / 1 http: // domain / project / 2 http: // domain / project / 3 http: // domain / project / 4 http : // domain / project / 5   
 Now my goal is to list this  list; Permission & gt; Permissions  by  users . So it gives me  
  var filteredAndGrouped = data.Where (u = & gt; u.User == @ "domain \ username")   
 After this I want to add this result to the group from the part of its URL.   Started with a URL of SiteCollections, if each permissions URL is started with  D.  == @ " Domain \ user ") .GroupBy (d = & gt; SiteCollections.Any (sc = & gt; sc.StartsWith (d.Url)))   
 This group is right with a key / Are incorrect and are the only URL which is excatly in the group with the key truth in the form of list  SiteCollections  What do I need to do in grouping with the url in the list  SiteCollections  and the permissions url must be started with the key of the group. To do this, there is no need to be equal.  
 Finally, I need a result in this form:  
  key: http: // domain / project / 1 permission 1 (url: http: // domain / Project / 1 / xyz / xyz) Permission 3 (url: http: // domain / project / 1 / xyzz / xqeqyz) Permission 7 (url: http: // domain / project / 1 / xadadyz / xadadyz) key: http: // domain / project / 2 permission 2 (url: http: // domain / project / 2 / adyz / xdyz) Permission 4 (url: http: // domain / project / 2 / a2dyz / xdyz) Permission 21 (URL: http: // domain / project / 2 / a22dyz / xdyz) key: http: // domain / project / 3 permission 22 (url: ...    
 
 
  var grouped = appendix Select .groupBy (x = & gt; SiteCollections.FirstOrDefault (u = & gt; x URL. Start (U)). Select (x => New {Key = X.Keys, Permissions = X. ToArray ( )}) .ORR ();   
 The result may be in the  null  key, that means the URL  SiteCollections .     is not present in.

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