Mega Code Archive
Convert an ArrayList to an IEnumerableT That Can Be Used with the Typical Standard Query Operators
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using System;
using System.Linq;
using System.Collections;
using System.Collections.Generic;
public class Employee {
public int id;
public string firstName;
public string lastName;
public static ArrayList GetEmployeesArrayList() {
ArrayList al = new ArrayList();
al.Add(new Employee { id = 1, firstName = "J", lastName = "R" });
al.Add(new Employee { id = 2, firstName = "W", lastName = "G" });
al.Add(new Employee { id = 3, firstName = "A", lastName = "H" });
al.Add(new Employee { id = 4, firstName = "D", lastName = "L" });
al.Add(new Employee { id = 101, firstName = "K", lastName = "F" });
return (al);
}
public static Employee[] GetEmployeesArray() {
return ((Employee[])GetEmployeesArrayList().ToArray(typeof(Employee)));
}
}
public class MainClass {
public static void Main() {
ArrayList employees = Employee.GetEmployeesArrayList();
Console.WriteLine("The data type of employees is " + employees.GetType());
var seq = employees.Cast<Employee>();
Console.WriteLine("The data type of seq is " + seq.GetType());
var emps = seq.OrderBy(e => e.lastName);
foreach (Employee emp in emps)
Console.WriteLine("{0} {1}", emp.firstName, emp.lastName);
}
}
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