[Solved] Bind GridDropDownColumn to List<string>

[tim]

Can I bind a GridDropDownColumn to a List<string>?

[Shinu]

Hello Tim,

The following documentation will help yuou in customizing the GridDropdownColumn. In the ItemDataBound event, access the dropdownlist control and set the DataSource.

Checkout the link: Customize/Configure GridDropDownColumn

-Shinu.

[tim]

Thank you.  I tried to replicate the sample http://www.telerik.com/help/aspnet-ajax/grdoperationswithdropdownlistinedititemtemplate.html with no luck.  Here's my code.

<telerik:RadGrid ID="Grid1" AutoGenerateColumns="false" runat="server" Width="90%">
            <MasterTableView>
                <Columns>
                    <telerik:GridBoundColumn HeaderText="" UniqueName="WDFields" DataField="friendlyname" />
                    <telerik:GridTemplateColumn UniqueName="ddHeader" HeaderText="Header">
                        <ItemTemplate>
                            <asp:DropDownList ID="HeaderDropDown" runat="server" />
                        </ItemTemplate>
                    </telerik:GridTemplateColumn>
                    <telerik:GridBoundColumn HeaderText="Sample" DataField="values" UniqueName="Sample" />
                </Columns>
            </MasterTableView>
        </telerik:RadGrid>

And code behind.

 private void Grid1_NeedDataSource(object source, GridNeedDataSourceEventArgs e)
    {
        DataTable param = ReadParam();
        Grid1.DataSource = param;
    }

    private void Grid1_ItemDataBound(object sender, GridItemEventArgs e)
    {
        List<string> header = ReadHeader();

        GridDataItem item = e.Item as GridDataItem;
        DropDownList list = item.FindControl("HeaderDropDown") as DropDownList;
        list.DataSource = header;
        list.DataBind();
    }

I have a breakpoint at Grid1_NeedDataSource, but I am not getting there.  Grid1_NeedDataSource is not being called.

Thanks,

Tim

[robertw102]

If the RadGrid markup you posted is correct. The reason the methods are not being called is because you didn't attach them to your grid. You'll notice that the event handlers are not set in the RadGrid declaration in your aspx page.

[tim]

Here's the code from the sample I referenced (http://www.telerik.com/help/aspnet-ajax/grdoperationswithdropdownlistinedititemtemplate.html). 

Where are the event handlers?

 <telerik:radgrid id="RadGrid1" runat="server"  AutoGenerateColumns="False">
           <MasterTableView>
              <Columns>
                 <telerik:GridBoundColumn UniqueName="ContactName" ReadOnly="True" HeaderText="ContactName"
                   DataField= "ContactName" />
                 <telerik:GridTemplateColumn UniqueName="TemplateColumn" HeaderText="Country">
                    <ItemTemplate>
                       <asp:Label id="Label1" runat="server">
                          <%# DataBinder.Eval(Container.DataItem, "Country") %>
                       </asp:Label>
                    </ItemTemplate>
                    <EditItemTemplate>
                       <asp:DropDownList id="List1" runat="server" />
                    </EditItemTemplate>
                 </telerik:GridTemplateColumn>
                 <telerik:GridEditCommandColumn UniqueName="EditCommandColumn" />
              </Columns>
           </MasterTableView>
</telerik:radgrid>

[tim]

Ah, needed to add,

private void Page_Load(object sender, EventArgs e)
    {
        Grid1.NeedDataSource += new GridNeedDataSourceEventHandler(Grid1_NeedDataSource);
        Grid1.ItemDataBound += new GridItemEventHandler(Grid1_ItemDataBound);
    }