private IEnumerable <Employee> JoeyOrderByKeepComparer(
IEnumerable <Employee> employees, ComboComparer comparer)
{
//new MyOrderedEnumerable();
//bubble sort
var elements = employees.ToList();
while (elements.Any())
{
var minElement = elements[0];
var index = 0;
for (int i = 1; i < elements.Count; i++)
{
var element = elements[i];
if (comparer.Compare(element, minElement) < 0)
{
minElement = element;
index = i;
}
}
elements.RemoveAt(index);
yield return(minElement);
}
}
private IEnumerable <Employee> JoeyOrderByLastNameAndFirstName(
IEnumerable <Employee> employees,
ComboComparer comboComparer)
{
//bubble sort
var elements = employees.ToList();
while (elements.Any())
{
var minElement = elements[0];
var index = 0;
var finalCompareResult = 0;
for (int i = 1; i < elements.Count; i++)
{
var employee = elements[i];
finalCompareResult = comboComparer.Compare(employee, minElement);
if (finalCompareResult < 0)
{
minElement = employee;
index = i;
}
}
elements.RemoveAt(index);
yield return(minElement);
}
}
public void lastName_firstname_Age()
{
var employees = new[]
{
new Employee {
FirstName = "Joey", LastName = "Wang", Age = 50
},
new Employee {
FirstName = "Tom", LastName = "Li", Age = 31
},
new Employee {
FirstName = "Joseph", LastName = "Chen", Age = 32
},
new Employee {
FirstName = "Joey", LastName = "Chen", Age = 33
},
new Employee {
FirstName = "Joey", LastName = "Wang", Age = 20
},
};
var firstComparer = new CombineKeyComparer <string>(element => element.LastName, Comparer <string> .Default);
var secondComparer = new CombineKeyComparer <string>(element => element.FirstName, Comparer <string> .Default);
var firstCombo = new ComboComparer(firstComparer, secondComparer);
var thirdComparer = new CombineKeyComparer <int>(element => element.Age, Comparer <int> .Default);
var finalCombo = new ComboComparer(firstCombo, thirdComparer);
var actual = JoeyOrderBy(employees, finalCombo);
var expected = new[]
{
new Employee {
FirstName = "Joey", LastName = "Chen", Age = 33
},
new Employee {
FirstName = "Joseph", LastName = "Chen", Age = 32
},
new Employee {
FirstName = "Tom", LastName = "Li", Age = 31
},
new Employee {
FirstName = "Joey", LastName = "Wang", Age = 20
},
new Employee {
FirstName = "Joey", LastName = "Wang", Age = 50
},
};
expected.ToExpectedObject().ShouldMatch(actual);
}
