Going Through A Foreach When It Can Get Modified? [duplicate]

Answer 1

use a for loop not a foreach

for(int i = 0; i < in Pizza.Count(), ++i)
{

    var Slice = Pizza[i];
    if(Slice.Flavor == "Sausage")
    {
        Me.Eat(Slice); //This removes an item from the list: "Pizza"
    }
}

Answer 2

Where can you order pizza where slices have separate toppings? Anyway...

Using Linq:

// Was "Me.Eat()" supposed to be "this.Eat()"?
Pizza
    .Where(slice => slice.Flavor == "Sausage")
    .Foreach(sausageSlice => { Me.Eat(sausageSlice); });    

The first two lines create a new list with only sausage slices. The third will take that new subset and pass each slice to Me.Eat(). The { and ;} may be superfluous. This is not the most efficient method because it first makes a copy (as do many other approaches that have been given), but it is certainly clean and readable.

BTW, This is only for posterity as the best answer was already given - iterate backward by index.