c# covert a for loop to for each (arraylist)

Aindriu Mac Giolla Eoin

hi, I have a for loop that works but I need to implement a foreach loop. How do I change to a foreach loop ? here is the existing working for loop in a method

public void liststudents()
{

           for (int i = 0; i < studentarraylist.Count; i++)
           {
               // Cast the object from the ArrayList to Student
               Student currentStudent = (Student)studentarraylist\[i\];
               Console.WriteLine("Student {0} {1}", currentStudent.FirstName, currentStudent.LastName);



           }
       }

Also, does the above code indeed cast the returned object from the ArrayList to a Student object ?

PIEBALDconsult

Aindriu Mac Giolla Eoin wrote:

change to a foreach loop

Why? For loops perform better.

Aindriu Mac Giolla Eoin wrote:

does the above code indeed cast the returned object

Looks like it; why do you ask?

Aindriu Mac Giolla Eoin

I need a foreach loop to satisfy a requirement even though a for loop might perform better. I was looking at [microsoft link] but could get the cast work as well I wanted to double check that the returned object was casted to its orignal type thanks !

Richard Deeming

Try this:

foreach (Student currentStudent in studentarraylist)
{
Console.WriteLine("Student {0} {1}", currentStudent.FirstName, currentStudent.LastName);
}

You should try to avoid the ArrayList class[^], as it's not strongly typed. Use the List<T> class[^] (or one of the other generic collection types) instead. Generics (C# Programming Guide)[^]

"These people looked deep within my soul and assigned me a number based on the order in which I joined." - Homer

Aindriu Mac Giolla Eoin

thanks for that, i know its not strongly typed and could use something else but I need to use it for a question.

Marjan Venema

While a for loop may perform better, a foreach loop reads better and is less prone to off-by-one errors. That is why I have come to prefer them everywhere except _proven_ performance bottlenecks.

foreach (Student currentStudent in studentarraylist)
{
Console.WriteLine("Student {0} {1}", currentStudent.FirstName, currentStudent.LastName);
}

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