[ASP.NET][WebControl] GridView自訂頁面切換功能
GridView中當想讓使用者自行設定每個頁面呈現多少列資料或是
讓使用者切換到第幾個頁面的時候，GridView的自帶PagerSettings就不是
很符合各自的需求了，這時候可以使用PagerTemplate來去自定功能
<PagerTemplate>
<asp:DropDownList ID="ddlSelectPageSize" runat="server" AutoPostBack="True" onselectedindexchanged="ddlSelectIndexChanged">
</asp:DropDownList>
<asp:DropDownList ID="ddlSelectPage" runat="server" AutoPostBack="True" onselectedindexchanged="ddlSelectIndexChanged">
</asp:DropDownList>
<asp:LinkButton ID="cmdFirstPage" runat="server" CommandName="Page" Text="第一頁"
CommandArgument="First" Visible="<%# ((GridView)Container.Parent.Parent).PageIndex!=0 %>" >
</asp:LinkButton>
<asp:LinkButton ID="cmdPreview" runat="server" CommandArgument="Prev" Text="上一頁"
CommandName="Page" Visible="<%# ((GridView)Container.Parent.Parent).PageIndex!=0 %>">
</asp:LinkButton>
<asp:Label ID="lblRowCount" runat="server"></asp:Label>
<asp:LinkButton ID="cmdNext" runat="server" CommandName="Page" Text="下一頁"
CommandArgument="Next" Visible="<%# ((GridView)Container.Parent.Parent).PageIndex!=((GridView)Container.Parent.Parent).PageCount-1 %>">
</asp:LinkButton>
<asp:LinkButton ID="cmdLastPage" runat="server" CommandArgument="Last" Text="最後一頁"
CommandName="Page" Visible="<%# ((GridView)Container.Parent.Parent).PageIndex!=((GridView)Container.Parent.Parent).PageCount-1 %>">
</asp:LinkButton>
</PagerTemplate>
</asp:GridView>
然後在CodeBehind中，頁面切換還是使用GridView的PageIndexChanging事件
每次在更動後，都要使GridView重新Bind
{
if (!IsPostBack)
{
gvBind(GridView1);
ddlBind(GridView1);
}
}
protected void gvBind(GridView gv)
{
using (IDbConnection conn = new SqlConnection(ConfigurationManager.ConnectionStrings["DBConnection"].ConnectionString))
{
string str = "select EmployeeID,Title,LastName,FirstName from Employees";
using (SqlDataAdapter da = new SqlDataAdapter(str, (SqlConnection)conn))
{
DataTable dt = new DataTable();
da.Fill(dt);
gv.DataSource = dt;
gv.DataBind();
}
}
}
protected void ddlBind(GridView gv)
{
if (gv.BottomPagerRow != null)
{
//讓下拉式選單顯示頁數
DropDownList ddlSelectPage = (DropDownList)gv.BottomPagerRow.FindControl("ddlSelectPage");
for (int i = 0; i < GridView1.PageCount; i++)
{
ddlSelectPage.Items.Add(new ListItem("第" + (i + 1).ToString() + "頁", i.ToString()));
}
//顯示目前頁數
ddlSelectPage.SelectedIndex = gv.PageIndex;
//下拉選單顯示頁面資料列數
DropDownList ddlSelectPageSize = (DropDownList)gv.BottomPagerRow.FindControl("ddlSelectPageSize");
if (ddlSelectPageSize.Items.Count <= 0)
{
ddlSelectPageSize.Items.Add(new ListItem("每頁1筆", "1"));
ddlSelectPageSize.Items.Add(new ListItem("每頁2筆", "2"));
ddlSelectPageSize.Items.Add(new ListItem("每頁3筆", "3"));
}
//顯示目前列數
ddlSelectPageSize.SelectedValue = gv.PageSize.ToString();
}
}
protected void GridView1_PageIndexChanging(object sender, GridViewPageEventArgs e)
{
((GridView)(sender)).PageIndex = e.NewPageIndex;
gvBind(((GridView)(sender)));
ddlBind(((GridView)(sender)));
}
protected void ddlSelectIndexChanged(object sender, EventArgs e)
{
int ddlIndex = 0;
if (int.TryParse(((DropDownList)(sender)).SelectedValue, out ddlIndex))
{
switch (((DropDownList)(sender)).ID)
{
case "ddlSelectPageSize":
GridView1.PageSize = ddlIndex;
break;
case "ddlSelectPage":
GridView1.PageIndex = ddlIndex;
break;
}
gvBind(GridView1);
ddlBind(GridView1);
}
}
畫面呈現
範例檔案 GridViewPage