[ASP.NET]GridView - 點擊col header改變排序

gridview sort c#

圓頭人 2018-08-23 16:33:20 ‧ 10496 瀏覽

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用SqlDataSource的情況

用GirdView搭配SqlDataSource控制項時，只需要在GirdView上設定AllowSorting="True"，就能有排序的功能。

** 1.拉SqlDataSource**

   <asp:SqlDataSource ID="SqlDataSource1" runat="server" ConnectionString="<%$ ConnectionStrings:testConnectionString %>" SelectCommand="SELECT top 10 * FROM [A]"></asp:SqlDataSource>

** 2.拉Grid & set AutoSorting = true and DataSource**

 <asp:GridView ID="GridView4" runat="server" AllowSorting="True" AutoGenerateColumns="False" DataSourceID="SqlDataSource1">
            <Columns>
                <asp:BoundField DataField="xxx" HeaderText="xxx" SortExpression="xxx" />
                <asp:BoundField DataField="chk" HeaderText="chk" SortExpression="chk" />
                <asp:BoundField DataField="chk2" HeaderText="chk2" SortExpression="chk2" />
                <asp:CheckBoxField DataField="chk3" HeaderText="chk3" SortExpression="chk3" />
            </Columns>
        </asp:GridView>

不用SqlDataSource

1.拉GridView
**set GridView.AutoSorting = true **　
add col & set DataField & SortExpression

    <asp:GridView ID="GridView2" runat="server" AllowSorting="True" AutoGenerateColumns="False" OnSorting="GridView_Sorting">
            <Columns>
                <asp:BoundField DataField="xxx" HeaderText="xxx" SortExpression="xxx" />
                <asp:BoundField DataField="chk" HeaderText="chk" SortExpression="chk"/>
                <asp:BoundField DataField="chk2" HeaderText="chk2" SortExpression="chk2"/>
                <asp:BoundField DataField="chk3" HeaderText="chk3" SortExpression="chk3"/>
            </Columns>
        </asp:GridView>

** 2.getdate &　set sort**

        private void GridView_DataBinding(GridView gv, string SortField, string SortDict)
        {
            string sConnstr = System.Configuration.ConfigurationManager.ConnectionStrings["testConnectionString"].ConnectionString;
            string cmd = "select top 10 * from A ";
 
            System.Data.DataTable dt = new connection.DBAccess().QueryDT(sConnstr, cmd); ;

            //用dataview來做,但每次sort就要再跟DBquery一次,有沒有不需query的方法?!
            System.Data.DataView dv = dt.DefaultView;
            if (SortField != "")
            {
                string SortTxt = SortField;
                if (SortDict == "1")
                    SortTxt += " DESC";
                dv.Sort = SortTxt;
            }
            gv.DataSource = dv;
            gv.DataBind();
        }

** 3.GridView_Sorting -取目前sort狀態 **

protected void GridView_Sorting(object sender, GridViewSortEventArgs e)
{
    //▲▼的code出自
    // http://social.msdn.microsoft.com/Forums/zh-TW/236/thread/932a0f2b-f777-4621-950a-6ed3d7c39139

    //Q:viewstate只有一個, 怎麼知道,這是哪個col的viewstate.
    //A:它不知道,所以如果其它col desc了,這個col只能asc.
    if (ViewState["SortDirection"] == null)
    {
        ViewState["SortDirection"] = SortDirection.Ascending.ToString();
    }
    //如果不要▲▼可以拿掉
    for (int i = 0; i <= ((GridView)sender).Columns.Count - 1; i++)
    {
        ((GridView)sender).Columns[i].HeaderText = ((GridView)sender).Columns[i].HeaderText.Replace("▲", "");
        ((GridView)sender).Columns[i].HeaderText = ((GridView)sender).Columns[i].HeaderText.Replace("▼", "");
    }
    for (int i = 0; i <= ((GridView)sender).Columns.Count - 1; i++)//有sortExpress的col,如果沒有設sortexpress,count就會是0
    {
        if (e.SortExpression == ((GridView)sender).Columns[i].SortExpression)
        {
            if (ViewState["SortDirection"].ToString() == SortDirection.Ascending.ToString())
            {
                e.SortDirection = SortDirection.Descending; 
                ViewState["SortDirection"] = SortDirection.Descending;
                ((GridView)sender).Columns[i].HeaderText = ((GridView)sender).Columns[i].HeaderText + "▼";//如果不要▲▼可以拿掉
            }
            else
            {
                e.SortDirection = SortDirection.Ascending; 
                ViewState["SortDirection"] = SortDirection.Ascending;
                ((GridView)sender).Columns[i].HeaderText = ((GridView)sender).Columns[i].HeaderText + "▲";//如果不要▲▼可以拿掉
            }
        }
    }
    string SortField = e.SortExpression; 
    string SortDir = e.SortDirection == SortDirection.Ascending ? "0" : "1";
    GridView_DataBinding((GridView)sender, SortField, SortDir);
}