Question

I have a ListView that displays comments for an article.
Each comments has a button that, when clicked, deletes that comment provided that the logged person is the comment’s owner or an administrator.

I need a way of storing comment’s ID in the ListView somehow and then I need to check if the ID of the comment’s author is the same as the ID of the logged user (which is stored in the Session) and then, if they match, display the button that deletes the comment when clicked.

Please help.

Answer 1

Specify DataKeyNames attribute on the ListView markup and then get the DataKey in the button click event

<asp:ListView runat="server" ID="myListView" DataKeyNames="CommentId" ...

and in button click event, you can get the id

(int)myListView.DataKeys[itemIndex]["CommentId"]

or get commentId in fourth ListItem

int commentId = (int)myListView.DataKyes[3]["CommentId"];

Edit, as you mention your requirements further

You can access the current item being bind to list view in ItemDataBound event

Just add the ItemDataBound event attribute on ListView mark up, and do your logic within the event

<asp:ListView onitemdatabound="myListView_ItemDataBound" runat="server" ID="myListView" ...

protected void myListView_ItemDataBound(object sender, ListViewItemEventArgs e)
{
    if (e.Item.ItemType == ListViewItemType.DataItem)
    {
        ListViewDataItem dataItem = (ListViewDataItem)e.Item;
        int commentId = (int)DataBinder.Eval(dataItem, "CommentId");

        // get author id based on comment id

        // or if you have auther id within the datasource
        // by which you are binding the listview then

        int ID_Author = (int)DataBinder.Eval(dataItem, "ID_Author");

        // get a reference to the delete button in the item
        // for instance you may do by this
        Control delete_button = e.Item.FindControl("deleteButtonId");

        // will hide if the author id don't match with the session id
        delete_button.Visible = ID_Author.Equals((int)Session["loggedin_userId"]);
    }
}