C# listview 点击列头排序的实例

实例如下：

#region 自定义变量
  int currentcol = -1;
  bool sort;
  #endregion//列头点击事件

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")//在设计器中把列头的tag设为"n",则表示该列按数字比较器处理,否则为文本
    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;
  }//文本比较器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);
    }
   }
  }  //数字比较器
  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);
    }
   }
  }

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