BC30456: 'DataItem' is not a member of 'System.Web.UI.Control ...
Robert Pfeffer
I have a gridview with an updatepanel in the itemtemplate. When I try to
reference
the container.dataitem from a control in the updatepanel then I get the the
error BC30456: 'DataItem' is not a member of 'System.Web.UI.Control ...
sample:
<asp:GridView ID="StudentMarksGridView" runat="server"
AutoGenerateColumns="False">
<Columns>
<asp:TemplateField HeaderText="MP1">
<HeaderTemplate>
<asp:Label ID="StudentMarks_Mark_Header_1" runat="server"
Text='<%# MarkBucketTitleShort(1) %>'></asp:Label>
</HeaderTemplate>
<ItemTemplate>
<asp:UpdatePanel UpdateMode="Conditional"
ID="StudentMarks_Mark_1_UP" runat="server">
<ContentTemplate >
<asp:TextBox ID="StudentMarks_Mark_1_DDL"
Visible='<%# not
DataBinder.Eval(Container.DataItem, "StudentMarks.IsDroppedSection" %>'
Enabled='<%# not
DataBinder.Eval(Container.DataItem, "StudentMarks.IsDroppedSection" %>'
AutoPostBack="true"
MaxLength="3"
CssClass="MarksUpdateMarkItemDDL"
runat="server"
Text='<%#
DataBinder.Eval(Container.DataItem, "StudentMarks.Mark_1_D" %>'>
</asp:TextBox>
</ContentTemplate>
</asp:UpdatePanel>
</ItemTemplate>
</asp:TemplateField>
</asp:GridView>
The gridview is programmatically bound to a list whose items have the above
referenced properties. The above gives the BC030456 error.
If the UpdatePanel is removed then it works fine.
If the above is changed to reference a function that is passed the container
it also works as follows:
<asp:GridView ID="StudentMarksGridView" runat="server"
AutoGenerateColumns="False">
<Columns>
<asp:TemplateField HeaderText="MP1">
<HeaderTemplate>
<asp:Label ID="StudentMarks_Mark_Header_1" runat="server"
Text='<%# MarkBucketTitleShort(1) %>'></asp:Label>
</HeaderTemplate>
<ItemTemplate>
<asp:UpdatePanel UpdateMode="Conditional"
ID="StudentMarks_Mark_1_UP" runat="server">
<ContentTemplate >
<asp:TextBox ID="StudentMarks_Mark_1_DDL"
Visible='<%# not
IsDroppedSection(Container) %>'
Enabled='<%# not
IsDroppedSection(Container) %>'
AutoPostBack="true"
MaxLength="3"
CssClass="MarksUpdateMarkItemDDL"
runat="server"
Text='<%# Mark(Container, 1) %>'>
</ContentTemplate>
</asp:UpdatePanel>
</ItemTemplate>
</asp:TemplateField>
</asp:GridView>
Code:
Public Function IsDroppedSection(ByVal ContainerControl As Control) As
Boolean
Return CType(CType(ContainerControl, GridViewRow).DataItem,
SectionStudentItem).StudentMarks.IsDroppedSection
End Function
Public Function Mark(ByVal ContainerControl As Control, ByVal Index As
Int16) As String
Return CType(CType(ContainerControl, GridViewRow).DataItem,
SectionStudentItem).StudentMarks.Mark(Index)
End Function
Any comment?
Thank you!
--
Robert Pfeffer
Student Management Services,LLC.
Vince Xu [MSFT]
I suggest you use "<%# Eval( "field" ) %>" instead of "<%#
DataBinder.Eval(Container.DataItem, "field") %>" in this scenario.
Container.DataItem is a runtime alias for the DataItem for this specific
item in the bound list.The actual type of DataItem is determined by the
type of the datasource.In this scenario, I think the type of the datasource
cause the issue.
DataBinder.Eval() is the helper method that figures out the syntax for you
and formats the result as a string. It's really convenient, and it's late
bound.
Please check this link about it:
http://weblogs.asp.net/rajbk/archive/2004/07/20/what-s-the-deal-with-databin
der-eval-and-container-dataitem.aspx
Sincerely,
Vince Xu
Microsoft Online Support
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