c# - 更改 listView.sorting 会触发 ItemCheckEventHandler

Question

我有一个 ListView，它的第一列上有复选框。在为自定义排序编写一些代码时(当用户单击列标题时)，我遇到了一些奇怪的行为。

当用户单击列标题时，我使用 ColumnClickEventHandler 将 listView.Sorting 设置为 SortOrder.Ascending (或 SortOrder.Descending)；当这行代码被击中时，它似乎会触发 ItemCheck 事件处理程序。

例如

listView.ItemCheck += new ItemCheckEventHandler(listView_ItemCheck);
listView.ColumnClick += new ColumnClickEventHandler(listView_ColumnClick);
...
...
void listView_ColumnClick(object sender, ColumnClickEventArgs e)
{
   // Determine whether the column is the same as the last column clicked.
   if (e.Column != sortColumn)
   {
      // Set the sort column to the new column.
      sortColumn = e.Column;
      // Set the sort order to ascending by default.
      listView.Sorting = SortOrder.Ascending;
   }
   else
   {
      // Determine what the last sort order was and change it.
      if (listView.Sorting == SortOrder.Ascending)
         listView.Sorting = SortOrder.Descending;
      else
         listView.Sorting = SortOrder.Ascending;
   }
}

行后 listView.Sorting = SortOrder.Descending;被击中时，将调用 listView.ItemCheck 的事件处理程序。

Answer 1

这可能是一个糟糕的技巧，但你可以尝试:

void listView_ColumnClick(object sender, ColumnClickEventArgs e)
{
   listView.ItemCheck -= listView_ItemCheck;
   // Determine whether the column is the same as the last column clicked.
   if (e.Column != sortColumn)
   {

      // Set the sort column to the new column.
      sortColumn = e.Column;
      // Set the sort order to ascending by default.
      listView.Sorting = SortOrder.Ascending;
   }
   else
   {
      // Determine what the last sort order was and change it.
      if (listView.Sorting == SortOrder.Ascending)
         listView.Sorting = SortOrder.Descending;
      else
         listView.Sorting = SortOrder.Ascending;

   } 
   listView.ItemCheck += listView_ItemCheck;
}

或

使用 bool 属性(private bool disableItemCheck_)用于

listView_ColumnClick (与我的修改相同的位置)和

listView_ItemCheck 

if (disableItemCheck_)
return;
//ItemCheck logic