Question

I have a list of objects and I’m doing a foreach on the list and I’m sending each object to a method that modifies the object and returns it; like this:

foreach (MyObjectModel o in TheMasterObject.ListOfMyObjectModel)
{
  o = MyMethod(o);
}

That doesn’t work. What I want to do is replace the object I’m iterating on with the modified version that gets returned by MyMethod.

What do I need to change?

Thanks.

Answer 1

You cannot reassign to the loop variable, and reassigning the variable wouldn’t affect the object inside the list anyway. If you need to write over the object in a list, use a for loop.

for (int index = 0; index < list.Count; index++)
{
     var obj = list[index];
     list[index] = MyMethod(obj);
}