如何使用LINQ獲取數據降序

Question

我有以下LINQ查詢，我希望數據按照totalPopulation降序排列。

var query = from u in xdoc.Root.Elements(ns + "DetailedUtility") 
      select new 
      { 
       UtilityId = (int)u.Attribute("UtilityId"), 
       TotalPopulation = u.Elements(ns + "City") 
            .Sum(c => (int)c.Attribute("Population")) 
      }; 

如何以降序獲取列表。 請幫助

Answer 1

var query = (from u in xdoc.Root.Elements(ns + "DetailedUtility") 
      select new 
      { 
       UtilityId = (int)u.Attribute("UtilityId"), 
       TotalPopulation = u.Elements(ns + "City") 
            .Sum(c => (int)c.Attribute("Population")) 
      }).OrderByDescending(x => x.TotalPopulation); 

或

var query = from u in xdoc.Root.Elements(ns + "DetailedUtility") 
      let population = u.Elements(ns + "City") 
           .Sum(c => (int)c.Attribute("Population")) 
      orderby population descending 
      select new 
      { 
       UtilityId = (int)u.Attribute("UtilityId"), 
       TotalPopulation = population 
      }; 

Answer 2

var query = (from u in xdoc.Root.Elements(ns + "DetailedUtility") 
      select new 
      { 
       UtilityId = (int)u.Attribute("UtilityId"), 
       TotalPopulation = u.Elements(ns + "City") 
            .Sum(c => (int)c.Attribute("Population")) 
      }).OrderByDescending(x => x.TotalPopulation);