C# – How to add controls to ItemTemplate (Repeater) at run time

c++repeater

I'm desinging a rich repeater control which needs some controls (specifically just an unordered list) added to it at runtime.

The solution I've opted for is to inject the nesseccary markup, onInit, into the header, item and footer templates respectively.
I can get the templates out (using InstantiateIn) and then add the markup as needed, but I don't know a way to add the template back in to the repeater?

Best Solution

In the past I've simply handled the ItemDataBound Event and modified the current RepeaterItem with whatever I needed to do.

Example:

private void Repeater1_ItemDataBound(object Sender, RepeaterItemEventArgs e)
{
    // Make sure you filter for the item you are after
    if ((e.Item.ItemType == ListItemType.Item) || (e.Item.ItemType == ListItemType.AlternatingItem))
    {
        PlaceHolder listLocation = (PlaceHolder)e.Item.FindControl("listPlaceHolder");
        var subItems = ((MyClass)e.Item.DataItem).SubItems;

        listLocation.Controls.Add(new LiteralControl("<ul>");

        foreach(var item in subItems)
        {
            listLocation.Controls.Add(new LiteralControl("<li>" + item + "</li>"));
        }

        listLocation.Controls.Add(new LiteralControl("</ul>");
    }
}

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R – What’s the best way to show multiple checkboxes for multiple records in ASP.NET

I think you might be looking for something like this:

ASPX:

<asp:Repeater ID="rptOuter" runat="server" OnItemDataBound="rptOuter_ItemDataBound">
        <HeaderTemplate>
            <ul style="list-style-type: none">
        </HeaderTemplate>
        <ItemTemplate>
            <li id='<%# Eval("Id") %>'>
            <%# Eval("Category") %>
            <asp:Repeater ID="rptInner" runat="server">
                <HeaderTemplate>
                    <ul style="list-style-type: none">
                </HeaderTemplate>
                <ItemTemplate>
                    <li>
                        <asp:CheckBox ID="chkFeed" runat="server" Text='<%# Eval("Feed") %>' />
                    </li>
                </ItemTemplate>
                <FooterTemplate>
                    </ul>
                </FooterTemplate>
            </asp:Repeater>
            </li>
        </ItemTemplate>
        <FooterTemplate>
            </ul>
        </FooterTemplate>
</asp:Repeater>

Code Behind:

protected void Page_Load(object sender, EventArgs e)
{
    using (SqlConnection conn = new SqlConnection(connString))
    {
        conn.Open();
        SqlCommand cmd = new SqlCommand("SELECT id, category FROM rsscategory_tbl", conn);
        SqlDataReader rdr = cmd.ExecuteReader();
        this.rptOuter.DataSource = rdr;
        this.rptOuter.DataBind();
        rdr.Close();
    }
}

protected void rptOuter_ItemDataBound(object sender, RepeaterItemEventArgs e)
{
    if (e.Item.ItemType == ListItemType.Item ||
        e.Item.ItemType == ListItemType.AlternatingItem)
    {            
        using (SqlConnection conn = new SqlConnection(connString))
        {
            conn.Open();
            System.Data.Common.DbDataRecord rd = (System.Data.Common.DbDataRecord)e.Item.DataItem;
            SqlCommand cmd = new SqlCommand("SELECT feed FROM rssfeed_tbl WHERE categoryid = " + rd.GetInt32(rd.GetOrdinal("id")), conn);
            Repeater rptInner = (Repeater)e.Item.FindControl("rptInner");
            SqlDataReader rdr = cmd.ExecuteReader();
            rptInner.DataSource = rdr;
            rptInner.DataBind();
            rdr.Close();
        }
     }
}

C# – How to force the .NET application to run as administrator

You'll want to modify the manifest that gets embedded in the program. This works on Visual Studio 2008 and higher: Project + Add New Item, select "Application Manifest File". Change the <requestedExecutionLevel> element to:

 <requestedExecutionLevel level="requireAdministrator" uiAccess="false" />

The user gets the UAC prompt when they start the program. Use wisely; their patience can wear out quickly.

Best Solution

Related Solutions

R – What’s the best way to show multiple checkboxes for multiple records in ASP.NET

C# – How to force the .NET application to run as administrator

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