如何使用linq resultset c#添加或预挂硬编码数据

假设下面的查询返回城市ID和城市名称，但如果我想pre-pend一些硬编码数据与linq的结果，那么我怎么能做到呢

var cityList = network.Continents
                      .SelectMany(continent => continent.Countries)
                      .Where(ctry => ctry.Id == "country")
                      .SelectMany(ctry =>  ctry.Cities,
                                  c => new City { Id = c.Id, Name = c.Name })
                      .ToList();

上面的查询将以这种方式返回数据

City ID                       City Name
--------                      ------------
1                             Bombay
2                             Kolkata
3                             Delhi

但是我想要这样的结果

City ID                       City Name
---------                     -----------
0                             --Select City--
1                               Bombay
2                               Kolkata
3                               Delhi

所以我想将此数据0 as ID and --Select City-- as Name添加到返回linq查询的列表中。帮助我与样例代码。由于

var cityList = network.Continents
                  .SelectMany(continent => continent.Countries)
                  .Where(ctry => ctry.Id == "country")
                  .SelectMany(ctry =>  ctry.Cities,
                              c => new City { Id = c.Id, Name = c.Name })
                  .ToList();
// yup, this is what I would do...
cityList.Insert(0, new City{ Id = 0, Name = "--Select City--"});

City[] prepend = new City[] {new City { Id = 0, Name = "--Select City--"}};
IEnumerable<City> cities = network.Continents
                      .SelectMany(continent => continent.Countries)
                      .Where(ctry => ctry.Id == "country")
                      .SelectMany(ctry =>  ctry.Cities,
                                  c => new City { Id = c.Id, Name = c.Name });
var citySequence = prepend.Concat(cities);
var cityList = citySequence.ToList();