linq頭脳嵐001_集約関数
7216 ワード
最大値Max()最小値Min()平均値Average()の合計個数Count()とSum()を求める
1、ソリッドBean
2、実体初期化器
3、結果
1、ソリッドBean
public class Tuzi
{
public int Id { get; set; }
public int Age { get; set; }
public string Name { get; set; }
}2、実体初期化器
static List<Tuzi> InitTuziInfo()
{
List<Tuzi> tuziList = new List<Tuzi> {
new Tuzi{ Name="Tuzi001", Age=10 },
new Tuzi{ Name="Tuzi002", Age=24 },
new Tuzi{ Name="Tuzi003", Age=33 },
new Tuzi{ Name="Tuzi004", Age=47 },
new Tuzi{ Name="Tuzi005", Age=59 },
new Tuzi{ Name="Tuzi006", Age=65 },
new Tuzi{ Name="Tuzi007", Age=76 },
new Tuzi{ Name="Tuzi008", Age=80 }
};
return tuziList;
}3、結果
static void Main(string[] args)
{
List<Tuzi> tuziList = InitTuziInfo();
#region 001
int maxAge = (from s in tuziList
select s).Max(a => a.Age);
Console.WriteLine(" :" + maxAge);
//Lambda
int minAge = tuziList.Select(a => a.Age).Min();
//==>
//minAge = tuziList.Select<Tuzi, int>(delegate(Tuzi t)
//{
// return t.Age;
//}).Min();
Console.WriteLine(" :" + minAge);
int avgAge = (int)tuziList.Select(a => a.Age).Average();
Console.WriteLine(" :" + avgAge);
avgAge = (int)tuziList.Where(a => a.Age != maxAge && a.Age != minAge).Average(a => a.Age);
Console.WriteLine(" ， :" + avgAge);
int ageCount = (int)tuziList.Select(a => a.Age).Count();
Console.WriteLine(" :" + ageCount);
int ageSum = (int)tuziList.Select(a => a.Age).Sum();
Console.WriteLine(" :" + ageSum);
#endregion
Console.ReadKey();
}