Neat way to write loop that has special logic for the first item in a collection

Question

Often I have to code a loop that needs a special case for the first item, the code never seems as clear as it should ideally be.

Short of a redesign of the C# language,

Answer 1

Another option I came up with is

enum ItemType
{
  First,
  Last,
  Normal
}

list.Foreach(T item, ItemType itemType) =>
{
   if (itemType == ItemType.First)
   {
   }

   // rest of code
};

Writing the extension method is left as an exercise for the reader… Also should two Boolean flags “IsFirst” and “IsLast” be used instead of ItemType enum, or ItemType be an object that has “IsFirst” and “IsLast” properties?