如何在Visual C#中清除数组

int[] arr = new int[] { 1, 2, 3, 4, 5 };
Array.Clear(arr, 0, arr.Length);

int[] arr = new int[] { 1, 2, 3, 4, 5 };
for (int i = 0; i < arr.Length; i++)
{
    arr[i] = default(int);
}

int[] arr = new int[] { 1, 2, 3, 4, 5 };
foreach (int item in arr)
{
    item = default(int);
}

int[] arr = new int[] { 1, 2, 3, 4, 5 };
for (int i = 0; i < arr.Length; i++)
{
    arr[i] = 0;
}

int[] arr = new int[] { 1, 2, 3, 4, 5 };
foreach (int item in arr)
{
    item = 0;
}