Fill List with default values? [duplicate]

Answer 1

if you have a fixed length list and you want all the elements to have the default value, then maybe you should just use an array:

int[] x  = new int[10];

Alternatively this may be a good place for a custom extension method:

public static void Fill(this ICollection lst, int num)
{
    Fill(lst, default(T), num);
}

public static void Fill(this ICollection lst, T val, int num)
{
    lst.Clear();
    for(int i = 0; i < num; i++)
        lst.Add(val);
}

and then you can even add a special overload for the List class to fill up to the capacity:

public static void Fill(this List lst, T val)
{
    Fill(lst, val, lst.Capacity);
}
public static void Fill(this List lst)
{
    Fill(lst, default(T), lst.Capacity);
}

Then you can just say:

List x  = new List(10).Fill();