I'm pretty new to ASP.Net and I'm not sure I'm going about this the right way. I have a Repeater which is bound to a list of "Image" objects. Within each RepeaterItem is a checkbox and I have a button OnClick event, which I want to display some attributes of the checked Image objects.
The label updates, but the metadata is blank. DataBinder.Eval(i.DataItem, "FileName") is coming back null, but I'm not sure why? I thought perhaps the postback from the checkbox was causing problems but I still get the same issue if I try to display the data before any postbacks have occurred, so perhaps I'm not fetching the attributes correctly. Or am I going about this in completely the wrong way? Any help appreciated.
Code:
protected void Page_Load(object sender, EventArgs e)
{
if (!Page.IsPostBack)
{
string importPath = Server.MapPath("~/Images/ForImport");
ImageProcessor processor = new ImageProcessor(importPath);
rptImageList.DataSource = processor.ImageList;
rptImageList.DataBind();
}
}
protected void btnImport_Click(object sender, EventArgs e)
{
foreach (RepeaterItem i in rptImageList.Items)
{
CheckBox chk = i.FindControl("chkSelectImage") as CheckBox;
if (chk.Checked)
{
Testlabel.Text += "Selected: " + DataBinder.Eval(i.DataItem, "FileName");
}
}
}
HTML:
<asp:Repeater ID="rptImageList" runat="server">
<ItemTemplate>
<div class="photoinstance">
<asp:Image runat="server" ImageUrl='<%#"Images/ForImport/" +DataBinder.Eval(Container.DataItem, "FileName") %>' />
<asp:CheckBox ID="chkSelectImage" AutoPostBack="true" runat="server"/>
<p><%#Eval("FileName")%> - <%#Eval("FileSize")%> bytes</p>
</div>
</ItemTemplate>
</asp:Repeater>
i.DataItem is not available (is null) at btnImport_Click, is available only at the ItemDataBound event (if I recall correctly the event name).
You can use a HiddenField to store the FileName then you will have to call i.FindControl.