我不知道为什么每个人都忘记使用隐藏字段！它们比 ViewState（我从 2005 年开始关闭）要“便宜”得多。如果您不想使用 Session 或 ViewState，那么这是我的解决方案：
将这两个隐藏字段放在您的 aspx 页面上，并为您的数据设置您想要的默认排序（例如，我使用 LastName）：
<asp:HiddenField ID="hfSortExpression" runat="server" Value="LastName" />
<asp:HiddenField ID="hfSortDirection" runat="server" Value="Ascending" />
然后把这个帮助代码放在你的基本页面中（你有一个基本页面不是吗？如果没有，把你的 .cs 代码放在后面）。
/// <summary>
/// Since native ASP.Net GridViews do not provide accurate SortDirections,
/// we must save a hidden field with previous sort Direction and Expression.
/// Put these two hidden fields on page and call this method in grid sorting event
/// </summary>
/// <param name="hfSortExpression">The hidden field on page that has the PREVIOUS column that is sorted on</param>
/// <param name="hfSortDirection">The hidden field on page that has the PREVIOUS sort direction</param>
protected SortDirection GetSortDirection(GridViewSortEventArgs e, HiddenField hfSortExpression, HiddenField hfSortDirection)
{
//assume Ascending always by default!!
SortDirection sortDirection = SortDirection.Ascending;
//see what previous column (if any) was sorted on
string previousSortExpression = hfSortExpression.Value;
//see what previous sort direction was used
SortDirection previousSortDirection = !string.IsNullOrEmpty(hfSortDirection.Value) ? ((SortDirection)Enum.Parse(typeof(SortDirection), hfSortDirection.Value)) : SortDirection.Ascending;
//check if we are now sorting on same column
if (e.SortExpression == previousSortExpression)
{
//check if previous direction was ascending
if (previousSortDirection == SortDirection.Ascending)
{
//since column name matches but direction doesn't,
sortDirection = SortDirection.Descending;
}
}
// save them back so you know for next time
hfSortExpression.Value = e.SortExpression;
hfSortDirection.Value = sortDirection.ToString();
return sortDirection;
}
接下来，您需要在网格排序事件处理程序中处理排序。在调用获取数据的主要方法之前，从排序事件处理程序调用上述方法
protected void gridContacts_Sorting(object sender, GridViewSortEventArgs e)
{
//get the sort direction (since GridView sortDirection is not implemented!)
SortDirection sortDirection = GetSortDirection(e, hfSortExpression, hfSortDirection);
//get data, sort and rebind (obviously, this is my own method... you must replace with your own)
GetCases(_accountId, e.SortExpression, sortDirection);
}
由于那里有很多示例使用 DataTables 或 DataViews 或其他非 LINQ 友好的集合，我想我会包含一个示例，即调用返回通用列表的中间层方法，并使用 LINQ 进行排序以完成示例并使其更“真实世界”：
private void GetCases(AccountID accountId, string sortExpression, SortDirection sortDirection)
{
//get some data from a middle tier method (database etc._)(
List<PendingCase> pendingCases = MyMiddleTier.GetCasesPending(accountId.Value);
//show a count to the users on page (this is just nice to have)
lblCountPendingCases.Text = pendingCases.Count.ToString();
//do the actual sorting of your generic list of custom objects
pendingCases = Sort(sortExpression, sortDirection, pendingCases);
//bind your grid
grid.DataSource = pendingCases;
grid.DataBind();
}
最后，这里是使用 LINQ 对自定义对象的通用列表进行的向下和脏排序。我敢肯定那里有一些更漂亮的东西可以解决问题，但这说明了这个概念：
私有静态列表排序（字符串排序表达式，排序方向排序方向，列表未决案例）{
switch (sortExpression)
{
case "FirstName":
pendingCases = sortDirection == SortDirection.Ascending ? pendingCases.OrderBy(c => c.FirstName).ToList() : pendingCases.OrderByDescending(c => c.FirstName).ToList();
break;
case "LastName":
pendingCases = sortDirection == SortDirection.Ascending ? pendingCases.OrderBy(c => c.LastName).ToList() : pendingCases.OrderByDescending(c => c.LastName).ToList();
break;
case "Title":
pendingCases = sortDirection == SortDirection.Ascending ? pendingCases.OrderBy(c => c.Title).ToList() : pendingCases.OrderByDescending(c => c.Title).ToList();
break;
case "AccountName":
pendingCases = sortDirection == SortDirection.Ascending ? pendingCases.OrderBy(c => c.AccountName).ToList() : pendingCases.OrderByDescending(c => c.AccountName).ToList();
break;
case "CreatedByEmail":
pendingCases = sortDirection == SortDirection.Ascending ? pendingCases.OrderBy(c => c.CreatedByEmail).ToList() : pendingCases.OrderByDescending(c => c.CreatedByEmail).ToList();
break;
default:
break;
}
return pendingCases;
}
最后但并非最不重要的一点（我已经说过了吗？）您可能希望在 Page_Load 处理程序中放置类似的内容，以便网格在页面加载时默认绑定...请注意，_accountId 是一个查询字符串参数，转换为自定义在这种情况下，我自己的 AccountID 类型...
if (!Page.IsPostBack)
{
//sort by LastName ascending by default
GetCases(_accountId,hfSortExpression.Value,SortDirection.Ascending);
}