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#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()=="text")//在設計器中把列頭的tag設為"text",則表示該列按文本比較器處理
  {
    lvw.ListViewItemSorter = new ListViewItemComparer(e.Column, sort);
  }
  if(lvw.Columns[e.Column].Tag.ToString()=="num")//在設計器中把列頭的tag設為"num",則表示該列按數字比較器處理
 {
    lvw.ListViewItemSorter = new ListViewItemComparerNum(e.Column, sort);
  }
  if(lvw.Columns[e.Column].Tag.ToString()=="time")//在設計器中把列頭的tag設為"time",則表示該列按日期比較器處理
  {
    lvw.ListViewItemSorter = new ListViewItemComparerTime(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);
    }
  }
}

//日期比較器
public class ListViewItemComparerTime : IComparer
{
    public bool sort_b;
    public SortOrder order = SortOrder.Ascending;
    private int col;


    public ListViewItemComparerTime()
    {
        col = 0;
    }


    public ListViewItemComparerTime(int column, bool sort)
    {
        col = column;
        sort_b = sort;
    }


    public int Compare(object x, object y)
    {
        DateTime d1 = Convert.ToDateTime(((ListViewItem)x).SubItems[col].Text);
        DateTime d2 = Convert.ToDateTime(((ListViewItem)y).SubItems[col].Text);
        if (sort_b)
        {
            return DateTime.Compare(d1, d2);
        }
        else
        {
            return DateTime.Compare(d2, d1);
        }
    }
}