C#开发中如何处理集合和数据结构的操作问题及解决

int[] array = new int[] { 1, 2, 3 };

for (int i = 0; i < array.Length; i++)
{
    Console.WriteLine(array[i]);
}

foreach (int item in array)
{
    Console.WriteLine(item);
}

int[] newArray = new int[array.Length + 1];

Array.Copy(array, newArray, array.Length);

newArray[array.Length] = newValue;

array = newArray;

int indexToDelete;

int[] newArray = new int[array.Length - 1];

Array.Copy(array, 0, newArray, 0, indexToDelete);
Array.Copy(array, indexToDelete + 1, newArray, indexToDelete, array.Length - indexToDelete - 1);

array = newArray;

int index = Array.IndexOf(array, targetValue);

if (index >= 0)
{
    Console.WriteLine("元素的索引为：" + index);
}
else
{
    Console.WriteLine("元素不存在数组中！");
}

List<int> list = new List<int>();

list.Add(1);
list.Add(2);
list.Add(3);

list.Remove(2);

int indexToDelete;

list.RemoveAt(indexToDelete);

int index = list.IndexOf(targetValue);

if (index >= 0)
{
    Console.WriteLine("元素的索引为：" + index);
}
else
{
    Console.WriteLine("元素不存在列表中！");
}

for (int i = 0; i < list.Count; i++)
{
    Console.WriteLine(list[i]);
}

foreach (int item in list)
{
    Console.WriteLine(item);
}