linq - OrderBy Parent object by Nested Collection -


simple

public class timeline {   public string name {get;set}   public list<milestone> milesstones {get;set} }  public class milestone {   public string name {get;set}   public datetime time {get;set} }

i tried: from t in dataaccess.timelinecollection.orderby(c=>c.milesstones.orderby(z=>z.milestonedate)) select t; got error "at least 1 object must implement icomparable."

i need order timeline milestone.time. first project in list 1 has eraliest time property in milestone collection.

need link.

it sounds might want

var query = dataaccess.timelinecollection                       .orderby(t => t.milestones.min(m => m.time));

in other words, each timeline, find earliest milestone, , use ordering.

of course if milestones in order, use:

var query = dataaccess.timelinecollection                       .orderby(t => t.milestones.first().time);

both of these fail if timeline has no milestones.


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