c# - LEFT OUTER JOIN in LINQ -


How to use the external code left in C # LINQ without using add-on-to-equal < / Code> section? Is there a way to do this where section? Right problem: Internal is easy to add and I have a solution like this 

  list & lt; Join & gt; Internal Finals = (From R to L of the right of L in the selection of l.Key == RKE new joint pi {LeftId = l.Id, RightId = r.Id})

but left the external solution for this. I need a solution. I have something like this but it is not working 

  list & lt; JoinPair & gt; LeftFinal = (Select the new challenges from the lefts between R of the rights {LeftId = l.Id, RightId = ((l.Key == r.Key)? R.Id: 0})

Where JointPayer is a class: 

  public square jointspair {long time left; long time true};

As stated: 

  var q = c in categories Select the ifEmpty () default from ps to P.C. in P.Category New {class = c, ProductName = p == empty? (No product) ": p.Pro DuctName};

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