"Elenco .Fieach () 'e mutabilità

Question

Voglio tradurre tutti i punti in un List<T>.Questo funziona:

for (int i = 0; i <PolygonBase.Count; ++i) 
{
    PolygonBase[i] = PolygonBase[i] + MousePos;
}

.

ma usando List<T>.ForEach 'T:

PolygonBase.ForEach(v => v += MousePos);

.

Idee?

Answer 1

Your current code is simply re-assigning the local variable v to a new value - it doesn't refer back to the original value in the list. It's the equivalent of writing:

foreach(int v in PolygonBase)
{
    v += MousePos;
}

To write back to the original value, use ConvertAll:

PolygonBase.ConvertAll(v => v += MousePos);

Answer 2

ForEach is not mutable, it doesn't change the data structure in any way. Check out this threat. Using conditional lambda statements with a foreach Action on a list