Question

I would like to use a data list for showing the usernames and their comments and attachments for each comment below the user name.

I have a user control ReviewListfor showing the comments and efiles in that. But I have error in this line (s.tblDraft.Comments) and an error below:

The non-generic type 'System.Collections.IEnumerable' cannot be used with type arguments

Please help. What is the problem?

private void Displayuser()
{
    var reviews =
      (from s in _DataContext.tblSends
       from u in _DataContext.Users

       where (s.DraftId == _Draftid) && (s.ToEmailId == u.ID)
       orderby u.Name
       select new
{
    userid = u.ID,
    username = u.Name,
    comments =s.tblDraft.Comments,
    w = s.tblDraft.Comments.SelectMany(q => q.CommentAttaches)

}).Distinct();

    DataList1.DataSource = reviews;
    DataList1.DataBind();

    var theReview = reviews.Single();

    DisplayReviews(theReview.comments, theReview.w);
}

private void DisplayReviews(IEnumerable<Comment> comments,
     IEnumerable<CommentAttach> w)
{
    ReviewList reviewList = (ReviewList)DataList1.FindControl("ReviewList1");
    reviewList.Comments = comments;
    reviewList.CommentAttachs = w;
    reviewList.DataBind();
}

Answer 1

The type the compiler sees is System.Collections.IEnumerable which is the non generic IEnumerable. You imported that namespace, so this is the type the compiler thinks you’re trying to use.

The type you’re trying to use is System.Collections.Generic.IEnumerable<T>. Add an import of that namespace and things should compile.