code. compile. run. debug. share.
using System;
using System.Collections.Generic;
using System.Linq;
// A common base class
public class MyBase {
public int Id {get; set;} = 0;
}
public class MyDerived : MyBase {
}
public class MyParallelDerived : MyBase {
}
class Program {
static void Main() {
var l = new List<MyBase>();
for (int i = 0; i < 40; i++){
switch (i%4){
case 1:
l.Add(new MyDerived(){Id = i}); break;
case 2:
l.Add(new MyParallelDerived(){Id = i}); break;
case 3:
l.Add(null); break;
case 0:
default:
l.Add(new MyBase(){Id = i});
break;
}
}
Console.WriteLine("Full List " + l.Count());
Console.WriteLine("OfType<MyBase> " + l.OfType<MyDerived>().Count());
Console.WriteLine("OfType<MyDerived> " + l.OfType<MyDerived>().Count());
Console.WriteLine("OfType<MyParallelDerived> " + l.OfType<MyParallelDerived>().Count());
Console.WriteLine("Select(s => s as MyBase) " + l.Select(s => s as MyBase).Count());
Console.WriteLine("Where(s => s is MyBase) " + l.Where(s => s is MyBase).Count());
try {
Console.WriteLine("Cast<MyBase>() " + l.Cast<MyBase>().Count());
}
catch (Exception ex){
Console.WriteLine("Cast<MyBase>() produced error " + ex.Message);
}
Console.WriteLine("Select(s => s as MyDerived) " + l.Select(s => s as MyDerived).Count());
Console.WriteLine("Where(s => s is MyDerived) " + l.Where(s => s is MyDerived).Count());
try {
Console.WriteLine("Cast<MyDerived>() " + l.Cast<MyDerived>().Count());
}
catch (Exception ex){
Console.WriteLine("Cast<MyDerived>() produced error " + ex.Message);
}
}
}
Compiling Program...
Standard Input:
Interactive Console
Text
Program is not being debugged. Click "Debug" button to start program in debug mode.
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