Discussion: how to use delegate anonymous methods to perform universal sorting on collections
- 2020-05-17 06:10:46
- OfStack
In Demo below I used two sorts
1. Let Employee inherit IComparable interface and realize CompareTo method sorting
2. Define a method that USES Comparison < T > Delegate, sort operations to anonymous methods
After looking at the code below, you know to use Comparison < T > The benefit of delegation?
1. Let Employee inherit IComparable interface and realize CompareTo method sorting
2. Define a method that USES Comparison < T > Delegate, sort operations to anonymous methods
After looking at the code below, you know to use Comparison < T > The benefit of delegation?
class Employee:IComparable
{
public string Name { get; set; }
public int Age { get; set; }
public static List<Employee> GetEmployees()
{
return new List<Employee>()
{
new Employee(){Name ="GuoHu",Age =25},
new Employee(){Name ="LeiHu",Age =23},
new Employee(){Name ="JunWenLi",Age =24},
new Employee(){Name ="JinHaoLiu",Age =25},
new Employee(){Name ="ChengFang",Age =24}
};
}
public int CompareTo(object obj)
{
Employee employee = obj as Employee;
if (employee != null)
{
return Name.CompareTo(employee.Name);
}
else
{
throw new ArgumentException("obj is not Employee");
}
}
}
class Test
{
static void SortAndShowFiles(string title, Comparison<Employee> employeeInfo)
{
List<Employee> employee = Employee.GetEmployees();
employee.Sort(employeeInfo);
Console.WriteLine(title);
foreach(Employee e in employee)
{
Console.WriteLine("Name:{0},Age:{1}", e.Name, e.Age);
}
}
static void Main()
{
List<Employee> employeeInfo = Employee.GetEmployees();
//Using IComparable sort
employeeInfo.Sort();
employeeInfo.ForEach(e => Console.WriteLine("Name:{0},Age{1}/t", e.Name, e.Age));
SortAndShowFiles("Sort by name", delegate(Employee e1, Employee e2) { return e1.Name.CompareTo(e2.Name); });
SortAndShowFiles("Sort by age", delegate(Employee e1, Employee e2) { return e1.Age.CompareTo(e2.Age); });
}
}