我想在c#中使用ArrayList添加和删除大量数字

我想知道输入大量数字时 'arraylist' 的性能。

'arraylist' 添加效果很好。但是删除'arraylist'需要很多时间。

例如，当我输入数字“10000000”时，添加速度很快。移除大约需要 15 分钟。

如何解决？

public partial class Form1 : Form
{
    Stopwatch stopwatch = new Stopwatch();
    ArrayList arrayList = new ArrayList();
    Hashtable hashtable = new Hashtable();
    HashSet<string> hashSet = new HashSet<string>();
    SortedList sortedList = new SortedList();
    Stack stack = new Stack();
    Queue queue = new Queue();

    static List<string > list = new List<string>() ;
    static Random rand = new Random(50000);

    static long count = 0;
    static  string inputCount = "";

    public Form1()
    {
        InitializeComponent();


    }

    private void Form1_Load(object sender, EventArgs e)
    {

    }

    private void textBox1_TextChanged(object sender, EventArgs e)
    {
        inputCount = countTextbox.Text;
        count = Convert.ToInt64(inputCount);
    }


    private void arrayListBtn_Click(object sender, EventArgs e)
    {
        for (int i = 0; i < count; i++)
        {
            list.Add($"T_{i.ToString("000000000")}");
        }

        Console.WriteLine(list.Count);
        stopwatch.Reset();
        stopwatch.Start();

        for (int i = 0; i < list.Count; i++)
        {
        }
        foreach (var item in list.ToList())
        {
            arrayList.Add(rand);
        }
        Console.WriteLine(arrayList.Count);
        stopwatch.Stop();
        arrayListAddTextBox.Text = stopwatch.Elapsed.ToString();

        stopwatch.Reset();
        stopwatch.Start();

        foreach (var item in list.ToList())
        {
            arrayList.Remove(item);
        }
        Console.WriteLine(arrayList.Count);
        stopwatch.Stop();
        arrayListRemoveTextBox.Text = stopwatch.Elapsed.ToString();

    }