[英]page load with child grids taking too much of time in loading the page
我有三個網格-類別網格,項目網格和子項目網格。 我有類別網格(grdCategories),對於每個類別,我都有許多綁定到子網格(grdItems)的項目。 對於每個項目,我都會在子子網格(grdSubItems)中顯示許多子項目。 現在的問題是頁面在加載數據上花費了太多時間。 我的HTML代碼如下:
加載數據甚至需要幾分鍾:
<asp:GridView ID="grdCategories" runat="server" AutoGenerateColumns="false" DataKeyNames="Category"
CssClass="menu_items" OnRowDataBound="grdCategories_RowDataBound">
<Columns>
<asp:TemplateField>
<ItemTemplate>
<asp:Panel ID="pnlMealOptionsHeader" runat="server" Width="100%">
<h1>
<a id='<%# Eval("CategoryX")%>'>
<asp:Label ID="lblCategory" runat="server" Text='<%#Eval("Category") %>' Visible="false"></asp:Label>
<asp:Label ID="lblCategoryX" runat="server" Text='<%#Eval("CategoryX") %>'></asp:Label>
</a>
</h1>
</asp:Panel>
<asp:Panel runat="server" ID="pnlMealOptionsBody">
<asp:Label ID="lblCategoryXX" runat="server" CssClass="title_2" Text='<%#Eval("CategoryXX") %>'></asp:Label>
<!--Items in Category -->
<asp:GridView ID="grdItems" runat="server" AutoGenerateColumns="false" CssClass="active-grid"
DataKeyNames="Item" OnRowDataBound="grdItems_RowDataBound" ShowHeader="false" >
<Columns>
<asp:TemplateField>
<ItemTemplate>
<asp:Label ID="lblItem" runat="server" Text='<%#Eval("Item") %>' Visible="false"></asp:Label>
<asp:Label ID="lblItemX" CssClass="title" runat="server" Text='<%#Eval("ItemX") %>'></asp:Label>
<asp:Label ID="lblItemXX" CssClass="title" runat="server" Text='<%#Eval("ItemXX") %>' style=" font-size:smaller; font-weight:normal"></asp:Label>
</ItemTemplate>
</asp:TemplateField>
<asp:TemplateField>
<ItemTemplate>
<asp:GridView ID="grdSubItems" runat="server" AutoGenerateColumns="false" CssClass=""
DataKeyNames="SubItem" ShowHeader="false" OnRowDataBound="grdSubItems_RowDataBound">
<HeaderStyle HorizontalAlign="Left" />
<Columns>
<asp:TemplateField>
<ItemTemplate>
<asp:Label ID="lblItem" runat="server" Text='<%#Eval("Item") %>' Visible="false"></asp:Label>
<asp:Label ID="lblSubItem" runat="server" Text='<%#Eval("SubItem") %>' Visible="false"></asp:Label>
<asp:Label ID="lblNoofOptions" runat="server" Text='<%#Eval("NumofOptions") %>' Visible="false"></asp:Label>
<asp:Label ID="lblSubItemX" CssClass="qty" runat="server" Text='<%#Eval("SubItemX") %>'></asp:Label>
</ItemTemplate>
</asp:TemplateField>
<asp:TemplateField>
<ItemTemplate>
<asp:Label ID="lblPrice" runat="server" CssClass="price" Text='<%#String.Format("£{0}",Eval("SellingCost")) %>'></asp:Label>
</ItemTemplate>
</asp:TemplateField>
</Columns>
</asp:GridView>
</ItemTemplate>
</asp:TemplateField>
</Columns>
</asp:GridView>
<!--End Items in Category -->
</asp:Panel>
</ItemTemplate>
</asp:TemplateField>
</Columns>
<EmptyDataTemplate>
<table width="900px">
<tr>
<td align="center">
<h1>
No Data Available</h1>
</td>
</tr>
</table>
</EmptyDataTemplate>
</asp:GridView>
private void FillCategoriesGrid()
{
DataSet ds = new DataSet();
ShopCategoryMapBL bl = new ShopCategoryMapBL(SessionContext.SystemUser);
bl.FetchForShop(ds, RowId);
grdCategories.DataSource = ds.Tables[0].DefaultView;
grdCategories.DataBind();
}
protected void grdCategories_RowDataBound(object sender, GridViewRowEventArgs e)
{
if (e.Row.RowType == DataControlRowType.DataRow)
{
GridView chkTopings = e.Row.FindControl("grdItems") as GridView;
Label lblCategory = e.Row.FindControl("lblCategory") as Label;
FillItemsGrid(chkTopings, WebHelper.Cast(lblCategory.Text, 0));
}
}
protected void FillItemsGrid(GridView grdItems, int Category)
{
try
{
//int cleanOrder = CargoBag.GetValue("CleanOrder", 0);
DataSet aDataSet = new DataSet();
ItemBL bl = new ItemBL(SessionContext.SystemUser);
bl.FetchForCategory(aDataSet, Category, RowId);
grdItems.DataSource = aDataSet.Tables[0];
grdItems.DataBind();
}
catch (Exception ex) { }
}
protected void grdItems_RowDataBound(object sender, GridViewRowEventArgs e)
{
if (e.Row.RowType == DataControlRowType.DataRow)
{
GridView grdSubItems = e.Row.FindControl("grdSubItems") as GridView;
Label lblItem = e.Row.FindControl("lblItem") as Label;
FillSubItemsGrid(grdSubItems, WebHelper.Cast(lblItem.Text, 0));
}
}
protected void FillSubItemsGrid(GridView grdSubItems, int Item)
{
try
{
//int cleanOrder = CargoBag.GetValue("CleanOrder", 0);
DataSet aDataSet = new DataSet();
SubItemBL bl = new SubItemBL(SessionContext.SystemUser);
bl.FetchForItem(aDataSet, Item);
grdSubItems.DataSource = aDataSet.Tables[0];
grdSubItems.DataBind();
}
catch (Exception ex) { }
}
您需要提供所有代碼,我們才能提供准確的答案。
例如:
SubItemBL在哪里定義?
還要嘗試找出確切的瓶頸所在。
是嗎
bl.FetchForCategory(aDataSet, Category, RowId);
要么
grdSubItems.DataBind();
如果上面的行是瓶頸,請注意,將Gridview綁定到具有大量數據的數據源的速度確實很慢。 您的數據有多大?
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