我有一個(gè)gridview，當(dāng)用戶(hù)單擊標(biāo)題時(shí)，我需要對(duì)其元素進(jìn)行排序。它的數(shù)據(jù)源是一個(gè)List對(duì)象。aspx是這樣定義的：<asp:GridView ID="grdHeader" AllowSorting="true" AllowPaging="false" AutoGenerateColumns="false" Width="780" runat="server" OnSorting="grdHeader_OnSorting" EnableViewState="true"> <Columns> <asp:BoundField DataField="Entitycode" HeaderText="Entity" SortExpression="Entitycode" /> <asp:BoundField DataField="Statusname" HeaderText="Status" SortExpression="Statusname" /> <asp:BoundField DataField="Username" HeaderText="User" SortExpression="Username" /> </Columns></asp:GridView>后面的代碼是這樣定義的：第一次加載：protected void btnSearch_Click(object sender, EventArgs e){ List<V_ReportPeriodStatusEntity> items = GetPeriodStatusesForScreenSelection(); this.grdHeader.DataSource = items; this.grdHeader.DataBind();}當(dāng)用戶(hù)點(diǎn)擊標(biāo)題時(shí)：protected void grdHeader_OnSorting(object sender, GridViewSortEventArgs e){ List<V_ReportPeriodStatusEntity> items = GetPeriodStatusesForScreenSelection(); items.Sort(new Helpers.GenericComparer<V_ReportPeriodStatusEntity>(e.SortExpression, e.SortDirection)); grdHeader.DataSource = items; grdHeader.DataBind();}我的問(wèn)題是e.SortDirection始終設(shè)置為升序。我的網(wǎng)頁(yè)使用了類(lèi)似的代碼，并且運(yùn)行良好，e.SortDirection在升序和降序之間交替。我做錯(cuò)了什么 ？
3 回答
小唯快跑啊
TA貢獻(xiàn)1863條經(jīng)驗(yàn) 獲得超2個(gè)贊
您可以使用會(huì)話(huà)變量來(lái)存儲(chǔ)最新的排序表達(dá)式，并在下次對(duì)網(wǎng)格進(jìn)行排序時(shí)，將網(wǎng)格的排序表達(dá)式與存儲(chǔ)最后一個(gè)排序表達(dá)式的Session變量進(jìn)行比較。如果兩列相等，則檢查上一個(gè)排序的方向，然后按相反的方向排序。
例：
DataTable sourceTable = GridAttendence.DataSource as DataTable;
DataView view = new DataView(sourceTable);
string[] sortData = ViewState["sortExpression"].ToString().Trim().Split(' ');
if (e.SortExpression == sortData[0])
{
if (sortData[1] == "ASC")
{
view.Sort = e.SortExpression + " " + "DESC";
this.ViewState["sortExpression"] = e.SortExpression + " " + "DESC";
}
else
{
view.Sort = e.SortExpression + " " + "ASC";
this.ViewState["sortExpression"] = e.SortExpression + " " + "ASC";
}
}
else
{
view.Sort = e.SortExpression + " " + "ASC";
this.ViewState["sortExpression"] = e.SortExpression + " " + "ASC";
}
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