namespace WinFormsApp4 { public partial class experiment : Form { public experiment() { InitializeComponent(); } int[] num = new int[10]; delegate bool Compare(int x, int y);//定义委托类型 void SortArray(Compare compare)//定义排序数组的方法 { for (int i = 0; i < num.Length; i++) for (int j = 0; j < i; j++) { if (compare(num[i], num[j]))//使用委托方法,比较两数大小. { int temp = num[i]; num[i] = num[j]; num[j] = temp; } } bool Ascending(int x, int y)//升序 { return x < y; } bool Descending(int x, int y)//降序 { return x > y; } public void display()//定义输出数组元素的方法 { txtTarget.Text = ""; foreach (int array in num) { txtTarget.Text += array + "\r\n"; } } } private void btnCreatArray_Click(object sender, EventArgs e) { txtSource.Text = string.Empty; Random rm = new Random(); for (int i = 0; i < num.Length; i++) { num[i] = rm.Next(10, 100); txtSource.Text += num[i] + "\r\n"; } } private void btnAscSort_Click(object sender, EventArgs e) { SortArray(new Compare(Ascending)); display(); } private void btnDescSort_Click(object sender, EventArgs e) { SortArray(new Compare(Descending)); display(); } } }

这段代码的问题在于 `Ascending` 和 `Descending` 方法定义在了 `SortArray` 方法内部，导致无法访问。同时， `display` 方法也定义在了 `SortArray` 方法内部，导致无法在其他方法中调用。

以下是优化后的代码，将 `Ascending`、`Descending` 和 `display` 方法提取到了类的外部，使其可以在其他方法中访问：

namespace WinFormsApp4
{
    public partial class experiment : Form
    {
        public experiment()
        {
            InitializeComponent();
        }

        int[] num = new int[10];

        delegate bool Compare(int x, int y);

        void SortArray(Compare compare)
        {
            for (int i = 0; i < num.Length; i++)
                for (int j = 0; j < i; j++)
                {
                    if (compare(num[i], num[j]))
                    {
                        int temp = num[i];
                        num[i] = num[j];
                        num[j] = temp;
                    }
                }
        }

        bool Ascending(int x, int y)
        {
            return x < y;
        }

        bool Descending(int x, int y)
        {
            return x > y;
        }

        void Display()
        {
            txtTarget.Text = "";
            foreach (int array in num)
            {
                txtTarget.Text += array + "\r\n";
            }
        }

        private void btnCreatArray_Click(object sender, EventArgs e)
        {
            txtSource.Text = string.Empty;
            Random rm = new Random();
            for (int i = 0; i < num.Length; i++)
            {
                num[i] = rm.Next(10, 100);
                txtSource.Text += num[i] + "\r\n";
            }
        }

        private void btnAscSort_Click(object sender, EventArgs e)
        {
            SortArray(new Compare(Ascending));
            Display();
        }

        private void btnDescSort_Click(object sender, EventArgs e)
        {
            SortArray(new Compare(Descending));
            Display();
        }
    }
}