gridview排序的基本问题

Question

public void GridView1_Sorting(object sender, GridViewSortEventArgs e)
    {
        ViewState["sortColumn"] = e.SortExpression;
        if (ViewState["sortDirection"] == null)
        {
            ViewState["sortDirection"] = "asc";
        }
        else
        {
            if (ViewState["sortDirection"] == "asc")
            {
                ViewState["sortDirection"] = "desc";
            }
            else
            {
                ViewState["sortDirection"] = "asc";
            }
        }
        Bind();
    }请问再次点击再次排序应该怎么修改呢?我这个就只能点击一次进行排序

Answer 1

if (ViewState["sortDirection"] == "asc")
 {
      ViewState["sortDirection"] = "desc";
  }
 else
 {
     ViewState["sortDirection"] = "asc";
  }
这样就可以排序了啊
不明白你的意思

Answer 2

if (ViewState["sortDirection"].ToString().ToLower() == "asc")
很奇怪的是,SQL语句为什么区分大小写呢?