Dynamic Access to controls in DetailsView

The DetailsView control is used for the project. In EditItemTemplate, You need to initialize a DropDownList data. I tried to use the FindControl method in the ModeChanging or ModeChanged event of the DetailsView control to obtain access to the target control, but all failed.

I used the DropDownList_DataBinding event to solve the problem. I added the onDataBinding event command to the DropDownList IN THE TemplateField OF THE DetailsView control. Then it will be okay to process this event in cs.

The code in aspx of DetailsView is as follows (data source code is omitted ):

1 <asp: DetailsView ID = "DetailsView1" DataKeyNames = "ClassID"
2 runat = "server" DataSourceID = "SqlDataSource1" AutoGenerateRows = "False">
3 <Fields>
4 <asp: BoundField HeaderText = "category name" DataField = "ClassTitle"/>
5 <asp: TemplateField HeaderText = "category">
6 <ItemTemplate>
7 <% # Eval ("ParentTitle") %>
8 </ItemTemplate>
9 <EditItemTemplate>
10 <asp: DropDownList ID = "ddlParent" runat = "server" onDataBinding = "ddlParent_DataBinding">
11 </asp: DropDownList>
12 </EditItemTemplate>
13 </asp: TemplateField>
14 <asp: CommandField ShowEditButton = "True"/>
15 </Fields>
16 </asp: DetailsView>

Cs file:
1 protected void ddlParent_DataBinding (object sender, EventArgs e)
2 {
3 // Add data binding code
4 // BindDropDownList (DropDownList) sender );
5}

Note:

The failure is because it is too early to call the FindControl method. You have to do this in the ItemCreated event or PreRender event of DetailsView.

Protected void DetailsView1_PreRender (object sender, EventArgs e)
{
If (IsPostBack)
{
DetailsView detailsView = (DetailsView) sender;
If (detailsView. CurrentMode = DetailsViewMode. Edit)
{
DropDownList dropDownList = (DropDownList) detailsView. FindControl ("DropDownList1 ");
DropDownList. Items. Add (new ListItem ("text", "value "));
}
}
}