static void DeconstructWithExtensionsMethods()
{
var racer = Formulal.GetChampions().Where(r => r.LastName == "Lauda").First();
(string first, string last, _, _) = racer;
Console.WriteLine($"{first}{last}");
}
static void UsingAnonymousTypes()
{
var racerNamesAndStarts = Formulal.GetChampions().Where(r => r.Country == "Italy").OrderByDescending(r => r.Wins).Select(r => new { r.LastName, r.Starts });
foreach (var r in racerNamesAndStarts)
{
Console.WriteLine($"{r.LastName},Starts:{r.Starts}");
}
}
private void Form1_Load(object sender, EventArgs e)
{
List <Racer> racers = Formulal.GetChampions() as List <Racer>;
///选取来自巴西的所有世界冠军
var res = from racer in racers
where racer.Country == "Brazil"
orderby racer.Wins descending
select racer.FirstName + " " + racer.LastName + " " + racer.Country;
this.listBox1.DataSource = Enumerable.ToList <string>(res);
Racer race = new Racer("Jochen", "Rindt", "Austria", 60, 6, new int[] { 1970 }, new string[] { "Lotus" });
///找出赢得至少15场比赛的巴西和奥地利赛车手
///
res = from racer in racers
where racer.Wins >= 15 && (racer.Country == "Brazil" || racer.Country == "Austria")
orderby racer.Wins descending
select racer.FirstName + " " + racer.LastName + " " + racer.Country;
this.listBox1.DataSource = Enumerable.ToList <string>(res);
///复合from子句
res = from racer in racers
from car in racer.Cars
where car == "Ferrari"
orderby racer.Wins descending
select racer.FirstName + " " + racer.LastName + " " + racer.Country;
this.listBox1.DataSource = Enumerable.ToList <string>(res);
//分组
var res1 = (from racer in racers
group racer by racer.Country into g
select g).ToList();
string res1111 = "";
foreach (IGrouping <string, Racer> coun in res1)
{
res1111 += Environment.NewLine + coun.Key + ":";
int flag = 0;
foreach (Racer r in coun.AsEnumerable <Racer>())
{
if (flag == 0)
{
res1111 += string.Format("{0:20}", r.FirstName);
}
else
{
res1111 += Environment.NewLine + string.Format("{0:40}", r.FirstName);
}
flag++;
}
}
this.richTextBox1.Text = res1111;
//组链接
var racer11 = Formulal.GetChampionships()
.SelectMany(r => new List <RacerInfo>()
{
new RacerInfo()
{
Year = r.Year,
Position = 1,
FirstName = r.First.Substring(0, r.First.IndexOf(" ")),
LastName = r.First.Substring(r.First.IndexOf(" ") + 1),
},
new RacerInfo()
{
Year = r.Year,
Position = 2,
FirstName = r.Second.Substring(0, r.Second.IndexOf(" ")),
LastName = r.Second.Substring(r.Second.IndexOf(" ") + 1),
},
new RacerInfo()
{
Year = r.Year,
Position = 3,
FirstName = r.Third.Substring(0, r.Third.IndexOf(" ")),
LastName = r.Third.Substring(r.Third.IndexOf(" ") + 1),
}
});
}