对ListView点击列标题自动排序功能

/// <summary>
    /// 对ListView点击列标题自动排序功能
    /// </summary>
    public class ListViewHelper
    {
        /// <summary>
        /// 构造函数
        /// </summary>
        public ListViewHelper()
        {
            //
            // TODO: 在此处添加构造函数逻辑
            //
        }

        public static void ListView_ColumnClick(object sender, System.Windows.Forms.ColumnClickEventArgs e)
        {
            System.Windows.Forms.ListView lv = sender as System.Windows.Forms.ListView;
            // 检查点击的列是不是现在的排序列.
            if (e.Column == (lv.ListViewItemSorter as ListViewColumnSorter).SortColumn)
            {
                // 重新设置此列的排序方法.
                if ((lv.ListViewItemSorter as ListViewColumnSorter).Order == System.Windows.Forms.SortOrder.Ascending)
                {
                    (lv.ListViewItemSorter as ListViewColumnSorter).Order = System.Windows.Forms.SortOrder.Descending;
                }
                else
                {
                    (lv.ListViewItemSorter as ListViewColumnSorter).Order = System.Windows.Forms.SortOrder.Ascending;
                }
            }
            else
            {
                // 设置排序列，默认为正向排序
                (lv.ListViewItemSorter as ListViewColumnSorter).SortColumn = e.Column;
                (lv.ListViewItemSorter as ListViewColumnSorter).Order = System.Windows.Forms.SortOrder.Ascending;
            }
            // 用新的排序方法对ListView排序
            ((System.Windows.Forms.ListView)sender).Sort();
        }
    }

    /// <summary>
    /// 继承自IComparer
    /// </summary>
    public class ListViewColumnSorter : System.Collections.IComparer
    {
        /// <summary>
        /// 指定按照哪个列排序
        /// </summary>
        private int ColumnToSort;
        /// <summary>
        /// 指定排序的方式
        /// </summary>
        private System.Windows.Forms.SortOrder OrderOfSort;
        /// <summary>
        /// 声明CaseInsensitiveComparer类对象
        /// </summary>
        private System.Collections.CaseInsensitiveComparer ObjectCompare;

        /// <summary>
        /// 构造函数
        /// </summary>
        public ListViewColumnSorter()
        {
            // 默认按第一列排序
            ColumnToSort = 0;

            // 排序方式为不排序
            OrderOfSort = System.Windows.Forms.SortOrder.None;

            // 初始化CaseInsensitiveComparer类对象
            ObjectCompare = new System.Collections.CaseInsensitiveComparer();
        }

        /// <summary>
        /// 重写IComparer接口.
        /// </summary>
        /// <param name="x">要比较的第一个对象</param>
        /// <param name="y">要比较的第二个对象</param>
        /// <returns>比较的结果.如果相等返回0，如果x大于y返回1，如果x小于y返回-1</returns>
        public int Compare(object x, object y)
        {
            int compareResult;
            System.Windows.Forms.ListViewItem listviewX, listviewY;

            // 将比较对象转换为ListViewItem对象
            listviewX = (System.Windows.Forms.ListViewItem)x;
            listviewY = (System.Windows.Forms.ListViewItem)y;

            string xText = listviewX.SubItems[ColumnToSort].Text;
            string yText = listviewY.SubItems[ColumnToSort].Text;

            int xInt, yInt;

            // 比较,如果值为IP地址，则根据IP地址的规则排序。
            if (IsIP(xText) && IsIP(yText))
            {
                compareResult = CompareIp(xText, yText);
            }
            else if (int.TryParse(xText, out xInt) && int.TryParse(yText, out yInt)) //是否全为数字
            {
                //比较数字
                compareResult = CompareInt(xInt, yInt);
            }
            else
            {
                //比较对象
                compareResult = ObjectCompare.Compare(xText, yText);
            }

            // 根据上面的比较结果返回正确的比较结果
            if (OrderOfSort == System.Windows.Forms.SortOrder.Ascending)
            {
                // 因为是正序排序，所以直接返回结果
                return compareResult;
            }
            else if (OrderOfSort == System.Windows.Forms.SortOrder.Descending)
            {
                // 如果是反序排序，所以要取负值再返回
                return (-compareResult);
            }
            else
            {
                // 如果相等返回0
                return 0;
            }
        }

        /// <summary>
        /// 判断是否为正确的IP地址，IP范围（0.0.0.0～255.255.255）
        /// </summary>
        /// <param name="ip">需验证的IP地址</param>
        /// <returns></returns>
        public bool IsIP(String ip)
        {
            return System.Text.RegularExpressions.Regex.Match(ip, @"^(25[0-5]|2[0-4][0-9]|[0-1]{1}[0-9]{2}|[1-9]{1}[0-9]{1}|[1-9]|0)/.(25[0-5]|2[0-4][0-9]|[0-1]{1}[0-9]{2}|[1-9]{1}[0-9]{1}|[1-9]|0)/.(25[0-5]|2[0-4][0-9]|[0-1]{1}[0-9]{2}|[1-9]{1}[0-9]{1}|[1-9]|0)/.(25[0-5]|2[0-4][0-9]|[0-1]{1}[0-9]{2}|[1-9]{1}[0-9]{1}|[0-9])$").Success;
        }

        /// <summary>
        /// 比较两个数字的大小
        /// </summary>
        /// <param name="ipx">要比较的第一个对象</param>
        /// <param name="ipy">要比较的第二个对象</param>
        /// <returns>比较的结果.如果相等返回0，如果x大于y返回1，如果x小于y返回-1</returns>
        private int CompareInt(int x, int y)
        {
            if (x > y)
            {
                return 1;
            }
            else if (x < y)
            {
                return -1;
            }
            else
            {
                return 0;
            }
        }

        /// <summary>
        /// 比较两个IP地址的大小
        /// </summary>
        /// <param name="ipx">要比较的第一个对象</param>
        /// <param name="ipy">要比较的第二个对象</param>
        /// <returns>比较的结果.如果相等返回0，如果x大于y返回1，如果x小于y返回-1</returns>
        private int CompareIp(string ipx, string ipy)
        {
            string[] ipxs = ipx.Split('.');
            string[] ipys = ipy.Split('.');

            for (int i = 0; i < 4; i++)
            {
                if (Convert.ToInt32(ipxs[i]) > Convert.ToInt32(ipys[i]))
                {
                    return 1;
                }
                else if (Convert.ToInt32(ipxs[i]) < Convert.ToInt32(ipys[i]))
                {
                    return -1;
                }
                else
                {
                    continue;
                }
            }
            return 0;
        }

        /// <summary>
        /// 获取或设置按照哪一列排序.
        /// </summary>
        public int SortColumn
        {
            set
            {
                ColumnToSort = value;
            }
            get
            {
                return ColumnToSort;
            }
        }

        /// <summary>
        /// 获取或设置排序方式.
        /// </summary>
        public System.Windows.Forms.SortOrder Order
        {
            set
            {
                OrderOfSort = value;
            }
            get
            {
                return OrderOfSort;
            }
        }
    }