.NET LINQ 投影運算

• 投影運算

• 方法

• Select 與 SelectMany

• 代碼示例

 Bouquet
{
     List<> Flowers { ; ; }
}
  SelectVsSelectMany()
{
    List<Bouquet> bouquets =  List<Bouquet>() {
         Bouquet { Flowers =  List<> { , , ,  }},
         Bouquet{ Flowers =  List<> { , ,  }},
         Bouquet{ Flowers =  List<> { , , , ,  }},
         Bouquet{ Flowers =  List<> { , , ,  }}
    };
    IEnumerable<List<>> query1 = bouquets.Select(bq => bq.Flowers);
    IEnumerable<> query2 = bouquets.SelectMany(bq => bq.Flowers);
    Console.WriteLine();
     (IEnumerable<String> collection  query1)
         ( item  collection)
            Console.WriteLine(item);
    Console.WriteLine();
     ( item  query2)
        Console.WriteLine(item);
}