查询显示了所需信息的一半LINQtoXML C＃

Question

我的XML文档包含国家，城市和其他地理对象列表，如下所示：

<mondial>
   <continent id="1" name="Europe"/>
   <continent id="2" name="Asia"/>
   <continent id="3" name="America"/>
   <continent id="4" name="Australia/Oceania"/>
   <continent id="5" name="Africa"/>
   <country id="f0_136" name="Albania" capital="f0_1461" population="3249136" datacode="AL" total_area="28750" population_growth="1.34" infant_mortality="49.2" gdp_agri="55" gdp_total="4100" inflation="16" indep_date="28 11 1912" government="emerging democracy" car_code="AL">
     <name>
       Albania
     </name>
     <city id="f0_1461" country="f0_136" longitude="10.7" latitude="46.2">
       <name>
         Tirane
       </name>
       <population year="87">
         192000
       </population>
     </city>
     <city id="f0_36498" country="f0_136" longitude="19.2" latitude="42.2">
       <name>
         Shkoder
       </name>
       <population year="87">
         62000
       </population>
       <located_at type="lake" water="f0_39058"/>
     </city>
     <city id="f0_36504" country="f0_136" longitude="19.3" latitude="41.2">
       <name>
         Durres
       </name>
       <population year="87">
         60000
       </population>
       <located_at type="sea" water="f0_38042"/>
     </city>
//etc it's only small part

并使用LINQtoXML显示人口超过100000的所有城市的任务 有些城市根本没有population。 所以我做到了：

var cities = from c in doc.Descendants("city")
             where c.Element("population") != null 
                   && (int)c.Element("population") > 100000
             select new
             {
                 name = c.Element("name"),
                 population = c.Element("population")
             };
foreach (var c in cities)
    Console.WriteLine("{0}{1}", c.name, c.population);

但它只显示了大约一半的城市