#region 自定義變量  int currentCol = -1;  bool sort;  #endregion//列頭點擊事件private void lvw_ColumnClick(object sender, ColumnClickEventArgs e)  {   string Asc = ((char)0x25bc).ToString().PadLeft(4, ' ');   string Des = ((char)0x25b2).ToString().PadLeft(4, ' ');   if (sort == false)   {    sort = true;    string oldStr = this.lvw.Columns[e.Column].Text.TrimEnd((char)0x25bc, (char)0x25b2, ' ');    this.lvw.Columns[e.Column].Text = oldStr + Des;   }   else if (sort == true)   {    sort = false;    string oldStr = this.lvw.Columns[e.Column].Text.TrimEnd((char)0x25bc, (char)0x25b2, ' ');    this.lvw.Columns[e.Column].Text = oldStr + Asc;   }   if(lvw.Columns[e.Column].Tag.ToString()=="n")//在設計器中把列頭的tag設為"n",則表示該列按數字比較器處理,否則為文本    lvw.ListViewItemSorter = new ListViewItemComparerNum(e.Column, sort);   else    lvw.ListViewItemSorter = new ListViewItemComparer(e.Column, sort);   this.lvw.Sort();   int rowCount = this.lvw.Items.Count;   if (currentCol != -1)   {    if (e.Column != currentCol)     this.lvw.Columns[currentCol].Text = this.lvw.Columns[currentCol].Text.TrimEnd((char)0x25bc, (char)0x25b2, ' ');   }   currentCol = e.Column;  }//文本比較器public class ListViewItemComparer : IComparer  {   public bool sort_b;   public SortOrder order = SortOrder.Ascending;   private int col;   public ListViewItemComparer()   {    col = 0;   }   public ListViewItemComparer(int column, bool sort)   {    col = column;    sort_b = sort;   }   public int Compare(object x, object y)   {    if (sort_b)    {     return String.Compare(((ListViewItem)x).SubItems[col].Text, ((ListViewItem)y).SubItems[col].Text);    }    else    {     return String.Compare(((ListViewItem)y).SubItems[col].Text, ((ListViewItem)x).SubItems[col].Text);    }   }  }  //數字比較器  public class ListViewItemComparerNum : IComparer  {   public bool sort_b;   public SortOrder order = SortOrder.Ascending;   private int col;   public ListViewItemComparerNum()   {    col = 0;   }   public ListViewItemComparerNum(int column, bool sort)   {    col = column;    sort_b = sort;   }   public int Compare(object x, object y)   {    decimal d1=Convert.ToDecimal(((ListViewItem)x).SubItems[col].Text);    decimal d2=Convert.ToDecimal(((ListViewItem)y).SubItems[col].Text);    if (sort_b)    {     return decimal.Compare(d1,d2);    }    else    {     return decimal.Compare(d2,d1);    }   }  }