c# listview点击标题排序

这是网上常见的一个点击标题排序的方法,可是缺点是当排序后再导入大量数据的时候速度会很慢.

using System;using System.Collections;using System.Windows.Forms;namespace Common{ /// <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; } } }}

private void Form1_Load(object sender, EventArgs e){ this.listView1.ListViewItemSorter = new Common.ListViewColumnSorter(); this.listView1.ColumnClick += new ColumnClickEventHandler(Common.ListViewHelper.ListView_ColumnClick);}

因为我想要的功能就是一个如果一列全数字的话,当点击列头的时候可以按照数字来排,所以改成下面的

//捕捉列头点击消息private void listView1_ColumnClick(object sender, System.Windows.Forms.ColumnClickEventArgs e) { ColumnSort columnsort = new ColumnSort(e.Column); columnsort.bAscending = (listView1.Sorting == SortOrder.Ascending); if (columnsort.bAscending) { listView1.Sorting = SortOrder.Descending; } else { listView1.Sorting = SortOrder.Ascending; } listView1.ListViewItemSorter = columnsort;//当排序完成后就把自动排序功能取消,这样可以防止再次导入数据的时候过慢! listView1.ListViewItemSorter = null; } public class ColumnSort : IComparer { private int columnNum = 0; public bool bAscending = true; public ColumnSort(int column_to_sort) { columnNum = column_to_sort; } private int CompareInt(int x, int y) { if (x > y) { return 1; } else if (x < y) { return -1; } else { return 0; } } public int Compare(object a, object b) { System.Windows.Forms.ListViewItem listItemA = (System.Windows.Forms.ListViewItem)a; System.Windows.Forms.ListViewItem listItemB = (System.Windows.Forms.ListViewItem)b; string xText = listItemA.SubItems[columnNum].Text; string yText = listItemB.SubItems[columnNum].Text; int xInt, yInt; if (bAscending) { if (int.TryParse(xText, out xInt) && int.TryParse(yText, out yInt)) return CompareInt(xInt, yInt); else return String.Compare(xText, yText); } else { if (int.TryParse(xText, out xInt) && int.TryParse(yText, out yInt)) return -1 * CompareInt(xInt, yInt); else return -1 * String.Compare(xText, yText); } } }