GridView Table Header Sort method setting

1.

2. Front Code

Description: Red Code is the core code

<asp:gridview id="Gvdata"runat="Server"autogeneratecolumns="False"onrowdatabound= "Gvdata_rowdatabound"onsorting= "gvdata_sorting" allowsorting= "true"> <Columns> <asp:templatefield headertext="News Headlines"> <ItemTemplate> <asp:label id="Labtitle"runat="Server"text='<%# Bind ("title")%>'></asp:Label> </ItemTemplate> </asp:TemplateField> <asp:templatefield headertext="Reading Volume"sortexpression= "Count"> <ItemTemplate> <asp:label id="Labcount"runat="Server"text='<%# Bind ("Count")%>'></asp:Label> </ItemTemplate> <itemstyle width="15%"/> </asp:TemplateField> <asp:templatefield headertext="Add People"> <ItemTemplate> <asp:label id="Labadmin"runat="Server"text='<%# Bind ("AdminName")%>'></asp:Label> </ItemTemplate> <itemstyle width="25%"/> </asp:TemplateField> <asp:templatefield headertext="Time"sortexpression= "ID"> <ItemTemplate>Add:<asp:label id="Labtime"runat="Server"text='<%# Bind ("Times")%>'></asp:Label> <asp:label id="Labtimepass"runat="Server"text='<%# Bind ("Timepass")%>'></asp:Label> <br/> </ItemTemplate> <itemstyle width="30%"/> </asp:TemplateField> </Columns> </asp:gridvi Ew>

3. Backstage Code

protected voidPage_Load (Objectsender, EventArgs e) {        if(!IsPostBack) {viewstate["SortOrder"] ="ID"; The default sort field must be viewstate["Orderdire"] ="Desc"; Default sort, must Filldata ();        }    }    protected voidFilldata () {
　　　　stringSort = (string) viewstate["SortOrder"] +" "+ (string) viewstate["Orderdire"];

　　　　string sql = "select * from Dt_news " +sort;
　　　　
　　　　The DataTable wrote himself, bound to the GridView to write himself, and I would not write here

}

protected voidGvdata_rowdatabound (Objectsender, GridViewRowEventArgs e) {        //determine if a table header        if(E.row.rowtype = =datacontrolrowtype.header) {//determine whether to sort//is the sort field information             for(inti =0; i < E.row.cells.count; i++) {ControlCollection cons=E.row.cells[i].                Controls; if(Cons. Count = =1) {LinkButton lb= cons[0] asLinkButton; if(LB! =NULL)                    {                        if(viewstate["SortOrder"]. ToString () = =lb.commandargument) {if(viewstate["Orderdire"]. ToString () = ="Desc") {lb. Text+="▼"; }                            Else{lb. Text+="▲"; }                        }                    }                }            }        }    }

protected voidGvdata_sorting (Objectsender, GridViewSortEventArgs e) {        stringSpage =e.sortexpression; if(viewstate["SortOrder"]. ToString () = =spage) {            if(viewstate["Orderdire"]. ToString () = ="Desc") viewstate["Orderdire"] ="ASC"; Elseviewstate["Orderdire"] ="Desc"; }        Else{viewstate["SortOrder"] =e.sortexpression; } Pagecontrol1.pagenow=1;    Filldata (); }

GridView Table Header Sort method setting