關於gridview排序問題

<asp:GridView ID="GridView1" runat="server" AutoGenerateColumns="False" CellPadding="4" ForeColor="#333333" GridLines="None" AllowSorting="True" OnSorting="GridView1_Sorting">
<FooterStyle BackColor="#507CD1" Font-Bold="True" ForeColor="White" />
<RowStyle BackColor="#EFF3FB" />
<Columns>
<asp:BoundField DataField="id" HeaderText="ID" SortExpression="id" />
<asp:BoundField DataField="name" HeaderText="NAME" SortExpression="name" />
<asp:BoundField DataField="age" HeaderText="AGE" SortExpression="age" />
</Columns>
<PagerStyle BackColor="#2461BF" ForeColor="White" HorizontalAlign="Center" />
<SelectedRowStyle BackColor="#D1DDF1" Font-Bold="True" ForeColor="#333333" />
<HeaderStyle BackColor="#507CD1" Font-Bold="True" ForeColor="White" />
<EditRowStyle BackColor="#2461BF" />
<AlternatingRowStyle BackColor="White" />
</asp:GridView>
</div>
</form>
</body>
</html>
需要對GridView啓用AllowSorting、設置OnSorting事件，對需要排序的列設定SortExpression屬性。

// 正確的屬性設置方法
            this.GridView1.Attributes.Add("SortExpression", "id");
this.GridView1.Attributes.Add("SortDirection", "ASC");

/// <summary>
/// GridView排序事件
/// </summary>
    protected void GridView1_Sorting(object sender, GridViewSortEventArgs e)
{
// 從事件參數獲取排序數據列
        string sortExpression = e.SortExpression.ToString();
// 假定爲排序方向爲“順序”
        string sortDirection = "ASC";
// “ASC”與事件參數獲取到的排序方向進行比較，進行GridView排序方向參數的修改
        if (sortExpression == this.GridView1.Attributes["SortExpression"])
{
//獲得下一次的排序狀態
            sortDirection = (this.GridView1.Attributes["SortDirection"].ToString() == sortDirection ? "DESC" : "ASC");
}
// 重新設定GridView排序數據列及排序方向
        this.GridView1.Attributes["SortExpression"] = sortExpression;
this.GridView1.Attributes["SortDirection"] = sortDirection;
this.BindGridView();
}

/// 綁定到GridView
/// </summary>
    private void BindGridView()
{
// 獲取GridView排序數據列及排序方向
        string sortExpression = this.GridView1.Attributes["SortExpression"];
string sortDirection = this.GridView1.Attributes["SortDirection"];
// 調用業務數據獲取方法
        DataTable dtBind = this.getDB();
// 根據GridView排序數據列及排序方向設置顯示的默認數據視圖
        if ((!string.IsNullOrEmpty(sortExpression)) && (!string.IsNullOrEmpty(sortDirection)))
{
dtBind.DefaultView.Sort = string.Format("{0} {1}", sortExpression, sortDirection);
}
// GridView綁定並顯示數據
        this.GridView1.DataSource = dtBind;
this.GridView1.DataBind();
}

爲了減少數據庫的鏈接，這裏使用的緩存catche,將生成的ds放到catche裏，然後重新綁定gridview。