public void OrderByThenBy()
{
Customer sam = new Customer {
Age = 25, Name = "Sam", ItemsInCart = 2, State = "Albania"
};
Customer dave = new Customer {
Age = 26, Name = "Dave", ItemsInCart = 2, State = "Romania"
};
Customer julia = new Customer {
Age = 25, Name = "Julia", ItemsInCart = 4, State = "Greece"
};
Customer sue = new Customer {
Age = 28, Name = "Sue", ItemsInCart = 1, State = "Italy"
};
Customer sally = new Customer {
Age = 21, Name = "Sally", ItemsInCart = 3, State = "Malta"
};
Customer sam2 = new Customer {
Age = 25, Name = "Sam", ItemsInCart = 5, State = "Denmark"
};
Customer angie = new Customer {
Age = 19, Name = "Angie", ItemsInCart = 2, State = "France"
};
var customers = new[]
{
sam,
dave,
julia,
sue,
sally,
sam2,
angie
};
var intComparer = new MyComparer <int>((x, y) => x.CompareTo(y));
Func <Customer, int> ageSelector = c => c.Age;
var firstComparer = new KeyComparer <Customer, int>(intComparer, ageSelector);
var stringComparer = new MyComparer <string>((x, y) => x.CompareTo(y));
Func <Customer, string> nameSelector = c => c.Name;
var secondComparer = new KeyComparer <Customer, string>(stringComparer, nameSelector);
Func <Customer, int> productsSelector = c => c.ItemsInCart;
var thirdComparer = new KeyComparer <Customer, int>(intComparer, productsSelector);
var ordered = customers.OrderBy(c => c, firstComparer).ThenBy(c => c, secondComparer).ThenBy(c => c, thirdComparer);
Assert.Equal(
new[]
{
angie,
sally,
julia,
sam,
sam2,
dave,
sue
}, ordered);
}
public void OrderBy()
{
Customer sam = new Customer {
Age = 25, Name = "Sam", ItemsInCart = 2, State = "Albania"
};
Customer dave = new Customer {
Age = 26, Name = "Dave", ItemsInCart = 2, State = "Romania"
};
Customer julia = new Customer {
Age = 25, Name = "Julia", ItemsInCart = 4, State = "Greece"
};
Customer sue = new Customer {
Age = 28, Name = "Sue", ItemsInCart = 1, State = "Italy"
};
Customer sally = new Customer {
Age = 21, Name = "Sally", ItemsInCart = 3, State = "Malta"
};
Customer adam = new Customer {
Age = 25, Name = "Adam", ItemsInCart = 5, State = "Denmark"
};
Customer angie = new Customer {
Age = 19, Name = "Angie", ItemsInCart = 2, State = "France"
};
var customers = new[]
{
sam,
dave,
julia,
sue,
sally,
adam,
angie
};
var comparer = new MyComparer <Customer>((x, y) =>
{
int result = x.Age.CompareTo(y.Age);
return(result == 0 ? x.Name.CompareTo(y.Name) : result);
});
var orderedByAgeAndName = customers
.OrderBy(c => c, comparer);
Assert.Equal(
new[]
{
angie,
sally,
adam,
julia,
sam,
dave,
sue
}, orderedByAgeAndName);
}
static void Main()
{
Customer sam = new Customer {
Age = 25, Name = "Sam", ItemsInCart = 2, State = "Albania"
};
Customer dave = new Customer {
Age = 26, Name = "Dave", ItemsInCart = 2, State = "Romania"
};
Customer julia = new Customer {
Age = 25, Name = "Julia", ItemsInCart = 4, State = "Greece"
};
Customer sue = new Customer {
Age = 28, Name = "Sue", ItemsInCart = 1, State = "Italy"
};
Customer sally = new Customer {
Age = 21, Name = "Sally", ItemsInCart = 3, State = "Malta"
};
Customer adam = new Customer {
Age = 25, Name = "Adam", ItemsInCart = 5, State = "Denmark"
};
Customer angie = new Customer {
Age = 19, Name = "Angie", ItemsInCart = 2, State = "France"
};
var customers = new[]
{
sam,
dave,
julia,
sue,
sally,
adam,
angie
};
var intComparer = new MyComparer <int>((x, y) => x.CompareTo(y));
Func <Customer, int> ageSelector = c => c.Age;
var firstComparer = new KeyComparer <Customer, int>(intComparer, ageSelector);
var stringComparer = new MyComparer <string>((x, y) => x.CompareTo(y));
Func <Customer, string> nameSelector = c => c.Name;
var secondComparer = new KeyComparer <Customer, string>(stringComparer, nameSelector);
Func <Customer, int> productSelector = c => c.ItemsInCart;
var thirdComparer = new KeyComparer <Customer, int>(intComparer, productSelector);
Func <Customer, string> stateSelector = c => c.State;
var fourthComparer = new KeyComparer <Customer, string>(stringComparer, stateSelector);
var orderByAge = customers.OrderBy(customer => customer, firstComparer);
var orderByName = orderByAge.ThenBy(customer => customer, secondComparer);
var orderByItemsInCart = orderByName.ThenBy(customer => customer, thirdComparer);
var orderByState = orderByItemsInCart.ThenBy(customer => customer, fourthComparer);
Console.WriteLine("Customers ordered by age: ");
foreach (var item in orderByAge)
{
Console.WriteLine(item.Age + " " + item.Name + " " + item.ItemsInCart + " " + item.State);
}
Console.WriteLine("Customers then ordered by name: ");
foreach (var item in orderByName)
{
Console.WriteLine(item.Age + " " + item.Name + " " + item.ItemsInCart + " " + item.State);
}
Console.WriteLine("Customers then ordered by items in cart: ");
foreach (var item in orderByItemsInCart)
{
Console.WriteLine(item.Age + " " + item.Name + " " + item.ItemsInCart + " " + item.State);
}
Console.WriteLine("Customers then ordered by state: ");
foreach (var item in orderByState)
{
Console.WriteLine(item.Age + " " + item.Name + " " + item.ItemsInCart + " " + item.State);
}
}
