拍拍尘土

tianyang:测试发现,对于空白列的排序还是会报错,呵呵,try{}catch{}下好象结果就不准确了.


//下面这句放在程序前面初始化
private int sortColumn = -1;


//列点击事件
  private void listView1_ColumnClick(object sender, System.Windows.Forms.ColumnClickEventArgs e)
    {
      if(this.listView1.SelectedItems.Count!=0)
        this.listView1.SelectedItems.Clear();
      if (e.Column != sortColumn)
      {
        // Set the sort column to the new column.
        sortColumn = e.Column;
        // Set the sort order to ascending by default.
        listView1.Sorting = SortOrder.Ascending;
      }
      else
      {
        // Determine what the last sort order was and change it.
        if (listView1.Sorting == SortOrder.Ascending)
          listView1.Sorting = SortOrder.Descending;
        else
          listView1.Sorting = SortOrder.Ascending;

      }
      // Call the sort method to manually sort.
      listView1.Sort();
      // Set the ListViewItemSorter property to a new ListViewItemComparer
      // object.
    
      this.listView1.ListViewItemSorter = new ZYFSLRForm1.ListViewItemComparer(e.Column,
        listView1.Sorting);
      //  this.listView1.ListViewItemSorter = new ListViewItemComparer(e.Column, listView1.Sorting);

    }


//主要排序操作的类
private class ListViewItemComparer : IComparer
    {
      private int col;
      private SortOrder order;
      public ListViewItemComparer()
      {
        col=0;
        order = SortOrder.Ascending;
      }


      public ListViewItemComparer(int column, SortOrder order)
      {
        col=column;
        this.order = order;
      }

      public int Compare(object x, object y)
      {
        int returnVal= -1;
        returnVal = String.Compare(((ListViewItem)x).SubItems[col].Text,
          ((ListViewItem)y).SubItems[col].Text);
        // Determine whether the sort order is descending.
        if(order == SortOrder.Descending)
          // Invert the value returned by String.Compare.
          returnVal *= -1 ;
        return returnVal;
      }
    }