Foreach loop and tasks - .net-4.0

Question

I know from the codeing guidlines that I have read you should not do
for (int i = 0; i < 5; i++)
{
Task.Factory.StartNew(() => Console.WriteLine(i));
}
Console.ReadLine();
as it will write 5 5's, I understand that and I think i understand why it is happening. I know the solution is just to do
for (int i = 0; i < 5; i++)
{
int localI = i;
Task.Factory.StartNew(() => Console.WriteLine(localI));
}
Console.ReadLine();
However is something like this ok to do?
foreach (MyClass myClass in myClassList)
{
Task.Factory.StartNew(() => myClass.DoAction());
}
Console.ReadLine();
Or do I need to do the same thing I did in the for loop.
foreach (MyClass myClass in myClassList)
{
MyClass localMyClass = myClass;
Task.Factory.StartNew(() => localMyClass.DoAction());
}
Console.ReadLine();

Answer 1

It's absolutely the same problem with foreach. The following:
foreach (MyClass myClass in myClassList)
{
Task.Factory.StartNew(() => myClass.DoAction());
}
will most probably always invoke the DoAction method on the last element of the list, which could be fixed like this:
foreach (MyClass myClass in myClassList)
{
MyClass localMyClass = myClass;
Task.Factory.StartNew(() => localMyClass.DoAction());
}
But instead of relying on local variables I would recommend you the following:
for (int i = 0; i < 5; i++)
{
Task.Factory.StartNew(localI => Console.WriteLine(localI), i);
}