public void ExampleReduction()
{
var customers = new CustomerGenerator().Generate(5);
var customersWithLotsOfLogins = customers.Where(c => c.LoginCount > 103);
var customersWithOverOneMillionLogins = customers.Where(c => c.LoginCount > 1_000_000);
var customer3ViaSingle = customers.Single(c => c.Id == 3);
var customer3ViaWhereSingle = customers.Where(c => c.Id == 3).Single();
var customersWithoutFirstCustomer = customers.Skip(1);
var firstThreeCustomers = customers.Take(3);
const int pageSize = 2;
var customersPage1 = customers.Skip(0).Take(pageSize);
var customersPage2 = customers.Skip(pageSize).Take(pageSize);
var pager = new Pager <Customer>(customers, pageSize);
var newPage1 = pager.Next();
var newPage2 = pager.Next();
var newPage3 = pager.Next();
var newPage4 = pager.Next();
var customersFromActiveOnward = customers.SkipWhile(c => !c.IsActive);
var allExceptLastTwoCustomers = customers.SkipLast(2);
var initialSetOfInactiveCustomers = customers.TakeWhile(c => !c.IsActive);
var lastTwoCustomers = customers.TakeLast(2);
var numbers = new int[] { 3, 1, 1, 2, 1, 3 };
var distinct = numbers.Distinct();
}
public void ExampleConversionItems()
{
var numbersAsObjects = new object[] { 1, 2, 3, 4, 5 };
var numbersAsInts = numbersAsObjects.Cast <int>();
var customers = new CustomerGenerator().Generate(5);
var users = customers.Select(c => new User()
{
Id = c.Id,
Name = c.FirstName + " " + c.LastName,
FavoriteNumbers = new int[0]
});
var inactivePeople = customers
.Where(c => !c.IsActive)
.Select(c => new { c.Id, Name = c.LastName + ", " + c.FirstName })
.OrderBy(p => p.Name);
var usersWithFavoriteNumbers = new User[]
{
new User()
{
Id = 1, Name = "User1", FavoriteNumbers = new int[] { 7 }
},
new User()
{
Id = 2, Name = "User2", FavoriteNumbers = new int[] { 1, 3, 7 }
},
new User()
{
Id = 3, Name = "User3", FavoriteNumbers = new int[] { 2, 3, 5, 7, 11 }
},
new User()
{
Id = 4, Name = "User4", FavoriteNumbers = new int[] { 1, 2 }
}
};
var allFavoriteNumbers = usersWithFavoriteNumbers.SelectMany(u => u.FavoriteNumbers);
var distinctOrderedFavoriteNumbers = usersWithFavoriteNumbers
.SelectMany(u => u.FavoriteNumbers)
.Distinct()
.OrderBy(n => n);
var infos = new PlayerInfo[]
{
new PlayerInfo()
{
PlayerId = 1, Name = "Name1", CreatedDate = DateTime.Parse("01/01/2001")
},
new PlayerInfo()
{
PlayerId = 2, Name = "Name2", CreatedDate = DateTime.Parse("02/02/2002")
}
};
var metadatas = new PlayerMetadata[]
{
new PlayerMetadata()
{
PlayerId = 1, Tags = new string[] { "strong slow" }
},
new PlayerMetadata()
{
PlayerId = 2, Tags = new string[] { "weak fast" }
}
};
var players = infos.Zip(metadatas, (i, m) => new Player()
{
Id = i.PlayerId == m.PlayerId ? i.PlayerId : Int32.MinValue,
Name = i.Name,
CreatedDate = i.CreatedDate,
Tags = m.Tags
});
}
