GridView控件：捕捉排序方向 [英] Gridview: capturing sort direction

问题描述

我有一个UpdatePanel与排序启用GridView和事件处理程序如下：

I have a gridview in an updatepanel with sorting enabled and an event handler as follows:

protected void MyGridSort(object sender, GridViewSortEventArgs e)
{
   var TheDirection = (e.SortDirection).ToString();
   var TheColumn = (e.SortExpression).ToString();
}

我把一个断点，这些代码行之后。我每次preSS列标题，我的变量TheDirection总是呈现递增。

I put a breakpoint just after these lines. Every time I press the column header, my variable TheDirection is always showing Ascending.

为什么不从上升到下降和背部切换？

Why is it not toggling from ascending to descending and back?

感谢。

推荐答案

您可以保留在ViewState或会话的方向。像这样的（未测试code）：

You could keep the direction in the ViewState or the Session. Like this (Untested Code):

protected void MyGridSort(object sender, GridViewSortEventArgs e)
{
   var TheDirection = (e.SortDirection).ToString();
   var TheColumn = (e.SortExpression).ToString();

   string prevColumn = "", prevDirection = "";

   if (Session["MyGridSortColumn"] != null)
      prevColumn = Session["MyGridSortColumn"].ToString();
   if (Session["MyGridSortDirection"] != null)
      prevDirection = Session["MyGridSortDirection"].ToString();

   if (TheColumn == prevColumn) {
      if (prevDirection == "ASC")
         TheDirection = "DESC";
      else
         TheDirection = "ASC";
   }

   Session["MyGridSortDirection"] = TheDirection;
   Session["MyGridSortColumn"] = TheColumn;

}

这篇关于GridView控件：捕捉排序方向的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！