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nHibernate QueryOver build programmatically?
var query = _session.QueryOver<Something>();
if(someterm!=null)
   query.Where(x=>x.SomeTerm==someTerm);

if(someotherterm!=null)
   query.Where(x=>x.SomeOtherTerm==someotherterm);

var results = query.List();

if(something!=null){
  SomeReference srAlias = null;
  query.JoinAlias(x=>x.SomeReference,()=>srAlias, JoinType.LeftOuterJoin)
       .Where(x=>srAlias.Something==something);
}