using System;
using System.Linq;
namespace pc.linq08
{
class Program
{
static void Main(string[] args)
{
var nums = Enumerable.Range(0, 10);
var result1 = from n in nums
group n by n % 2 == 0 ? "Even" : "Odd"
into g select new { Key = g.Key,
Nums = g,
Sum = g.Sum()};
var result2 = nums.GroupBy(n => n %
2 == 0 ? "Even" : "Odd")
.Select(g => new {Key= g.Key, Nums = g, Sum =
g.Sum() });
foreach (var g in result1) {
Console.WriteLine($"\n\nKey: {g.Key}");
Console.WriteLine($"Sum: {g.Sum}");
Array.ForEach(g.Nums.ToArray(),n => Console.Write($"{n}, "));
}
foreach (var g in result2) {
Console.WriteLine($"\n\nKey: {g.Key}");
Console.WriteLine($"Sum: {g.Sum}");
Array.ForEach(g.Nums.ToArray(), n => Console.Write($"{n}, "));
}
Console.WriteLine("\n");
}
}
}
using System;
using System.Linq;
namespace pc.linq07
{
class Person
{
public string
FirstName { get; set; }
public string LastName
{ get; set; }
public Person(string
FirstName, string LastName)
{
this.FirstName = FirstName;
this.LastName = LastName;
}
public override string
ToString()
{
return $"{FirstName} {LastName}";
}
}
class Program
{
static void Main(string[] args)
{
var ppl = new Person[] { new Person("Pawel", "Chooch"),
new Person("Magda", "Tyvoniuk"), new Person("Jake", "Smith"),
new Person("Adam", "Chooch"), new Person("Pawel","Smith"),
new Person("Tomek", "Chooch"), new Person("Adam","Smith"),
new Person("Jake","Tyvoniuk")};
var LastNameLengths = from p in ppl
group p by GetStringLengthValue(p.LastName.Length)
into g select new { Key =
g.Key,
PersonCount = g.Count(),
Persons =
g };
var FirstNameLengths = ppl.GroupBy(p =>
GetStringLengthValue(p.FirstName.Length))
.Select(g => new {Key = g.Key,
PersonCount = g.Count(),
Persons =
g});
foreach (var data in LastNameLengths) {
Console.WriteLine($"\nLastname letter count:
{data.Key}\nPeople:{data.PersonCount}");
Array.ForEach(data.Persons.ToArray(),
p => Console.WriteLine($"\t{ p.ToString()} "));
}
foreach (var data in FirstNameLengths) {
Console.WriteLine($"\nFirstname letter count:
{data.Key}\nPeople:{data.PersonCount}");
Array.ForEach(data.Persons.ToArray(),
p => Console.WriteLine($"\t{ p.ToString()} "));
}
}
static string
GetStringLengthValue(int l) {
switch (l) {
case 1: return "One";
case 2: return "Two";
case 3: return "Three";
case 4: return "Four";
case 5: return "Five";
case 6: return "Six";
case 7: return "Seven";
case 8: return "Eight";
default: return "More
than Eight";
}
}
}
}
