[wdvltalk] Re: asp.net datagrid - binding data to a column

[Howard Cheng]

cronan gogarty wrote:
> I think my problem is a little more basic than this!
>
> I have been looking at examples all weekend and I
> still havent found a solution.
Well, your best bet is to avoid the BoundColumn and just use a 
TemplateColumn instead.

> So in essence what I want is
> 1 datagrid with;
> 1 a col containg checkboxes
> 2 a boundcol containing the filename
> 3 a col displaying an image dependent on the
>   file extension
> 4 a col displaying a hyperlink to perform some
>   actions on the file
<asp:DataGrid ID="myGrid" OnItemCommand="myGrid_OnItemCommand" 
OnItemDataBound="myGrid_OnItemDataBound" Runat="server">
    <Columns>
        <asp:TemplateColumn>
            <asp:CheckBox ID="myCbx" Runat="server"/>
        </asp:TemplateColumn>
        <asp:TemplateColumn>
            <%# (string) Container.DataItem %>
        </asp:TemplateColumn>
        <asp:TemplateColumn>
            <asp:Image ID="myImg" ImageUrl='<%# "/images" + ((string) 
Container.DataItem %>' Runat="server"/>
        </asp:TemplateColumn>
        <asp:TemplateColumn>
            <asp:LinkButton ID="myLink" Text="..." Runat="server"/>
        </asp:TemplateColumn>
    </Columns>
</asp:DataGrid>

So there are your columns. I assume that the image shouldn't show if the 
file in question isn't actually in image, so you will want to change its 
visibility as soon as it's bound (thus, the ItemDataBound event handler).

protected void myGrid_OnItemDataBound(object sender, 
DataGridItemEventArgs e)
{
    if (e.Item.ItemType != ListItemType.Item && e.Item.ItemType != 
ListItemType.Alternating Item)
    {
        // don't do anything if the current row is not an item or 
alternating item
        return;
    }
    string file = (string) e.Item.DataItem;
    if (!file.EndsWith(".jpg") || !file.EndsWith(".gif") || 
!file.EndsWith(".png"))
    {
        Image img = (Image) e.Item.FindControl("myImg");
        img.Visible = false;
    }
}

Lastly, an event handler for when the LinkButton is clicked.
protected void myGrid_OnItemCommand(object sender, 
DataGridCommandEventArgs e)
{
    string file = (string) e.Item.DataItem;
    Response.Redirect("Somefile.aspx?file=" + Server.HtmlEncode(file), 
true);
}

HTH.
--
::::::::::::::::::::::::::::::
Howard Cheng
http://www.howcheng.com/
Wise-cracking quote goes here.
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