Question

What are my options for rewriting following snippet to eliminate code duplication at points A and B:

var value = source.GetNext(); // A
while (value != -1) 
{
    sum += value;
    value = source.GetNext(); // B
}

Rewriting using mid-loop break is not acceptable:

while (true)
{
    int value = source.GetNext();
    if (value == -1) break;
    sum += value;
}

Answer 1

Easy peasy 🙂

while ((value = source.GetNext()) != -1)
{
    sum += value;
}