I think I've got a fix for the EmptyDataTemplate issue:

Add the following to RenderContents in GridViewAdapter.cs right before the ///// BODY //// section

/////////////// EmptyDataTemplate ///////////////////////
if (gridView.Rows.Count == 0) {
	//Control[0].Control[0] s/b the EmptyDataTemplate.
	if (gridView.HasControls()) {
		if (gridView.Controls[0].HasControls()) {
			if (gridView.Controls[0].Controls[0] is GridViewRow) {
				rows.Clear();
				rows.Add(gridView.Controls[0].Controls[0]);
				gvrc = new GridViewRowCollection(rows);
				WriteRows(writer, gridView, gvrc, "tfoot");
			}
		}
	}
}					

Add the following to GetRowClass right before return className.Trim();

//// EmptyDataTemplate 
if ((row.RowType & DataControlRowType.EmptyDataRow) == DataControlRowType.EmptyDataRow) {
	className += " AspNet-GridView-Empty ";
}

Finally, if you want to override the standard tfoot style, add a CSS section in GridViewExample -

/* Optional AspNet-GridView-Empty to override tfoot used for EmptyDataTemplate */
.AspNet-GridView table tfoot tr.AspNet-GridView-Empty td 
{
	color: #F7F6F3;
	background: #5D7B9D;
	font-weight: bold;
	border-bottom: solid 1px #CCCCCC;
	border-right: solid 1px #CCCCCC;
	padding: 2px;
}

I've only worked with the GridView so far, hopefully someone can adapt this where necessary.

-Chris

This fix injects an issue in existing rendering function. I am seeing it in VB.Net. However, I think it may be same for C#.

Public Class GridViewAdapter
  Inherits System.Web.UI.WebControls.Adapters.WebControlAdapter
  Private Sub WriteRows(ByVal writer As HtmlTextWriter, ByVal gridView As GridView, ByVal rows As GridViewRowCollection, ByVal tableSection As String)
  ...

  Dim cell As TableCell
  For Each cell In row.Cells
    Dim fieldCell As DataControlFieldCell = cell

  ...
  End Sub

...
End Class

 For EmptyDataTemplate, cell is of type TableCell which throws an exception as it can not be casted to DataControlFieldCell.

 Here is the suggested fix:

Public Class GridViewAdapter
  Inherits System.Web.UI.WebControls.Adapters.WebControlAdapter
  Private Sub WriteRows(ByVal writer As HtmlTextWriter, ByVal gridView As GridView, ByVal rows As GridViewRowCollection, ByVal tableSection As String)
  ...

  Dim cell As TableCell
  For Each cell In row.Cells
    If (TypeOf cell Is DataControlFieldCell) Then
      Dim fieldCell As DataControlFieldCell = cell
      ...
    End If
  ...
  End Sub

...
End Class

foreach (TableCell cell in row.Cells)
{
	DataControlFieldCell fieldCell = cell as DataControlFieldCell;
	if ((fieldCell != null) && (fieldCell.ContainingField != null))
	{

The "as" keyword ensures fieldCell is null of not of type DataControlFieldCell, and the following "if" statement checks for the null value.

Thanks Chris for the fix, I have used it and its working well. I have downloaded the current version from CodePlex as suggested but it has not solved the problem.

The current "release" version from CodePlex is the same as the original release from Microsoft. TO get the changes outlined here (and other subsequent changes to the community version since that release) you have to download the latest build from the "Source Code" tab.

thank you for your source.

however, i checked the codeplex css friendly page and found nothing listed under the "source code" tab. am i missing something?

thank you.

 

No, you're not missing anything. What happened is CodePlex lost one of their source control servers, which happened to be the one we used, and in turn lost all our source code and work items. (See this thread.) They've since moved us to a new source control server. I will have to check-in the latest code release to the new server. When I do that I'll post a note here (probably will be some time today).

wow, what are the chances of that happening!

i'll just continue to check the site then. thank you!
 

After fighting for 30 minutes I got the code checked back in: http://www.codeplex.com/cssfriendly/SourceControl/ListDownloadableCommits.aspx

If CodePlex used Subversion, I'd be much happier (and would have gotten 29 minutes of my life back).

The latest code check-in includes the emptydatatemplate and a radiobuttonlist adapter.

FYI, one can use the TryCast() method in VB.Net to give the equivalent of the C# "as" keyword.

Anyways, it's probably best to also include the user-specified EmptyDataRowCssClass for the EmptyDataTemplate for the GetRowClass() function:

Hi all,
unfortunately this fix doesn't work correctly in case of you decide to show the header for EmptyData situation.

For example I have created a new class inherited from GridView to always display the Header (i found a lot of samples in the web).
In this case the code:
 

/////////////// EmptyDataTemplate ///////////////////////
if (gridView.Rows.Count == 0) {
	//Control[0].Control[0] s/b the EmptyDataTemplate.
	if (gridView.HasControls()) {
		if (gridView.Controls[0].HasControls()) {
			if (gridView.Controls[0].Controls[0] is GridViewRow) {
				rows.Clear();
				rows.Add(gridView.Controls[0].Controls[0]);
				gvrc = new GridViewRowCollection(rows);
				WriteRows(writer, gridView, gvrc, "tfoot");
			}
		}
	}
}

I have fixed this issue with the following code:
 

....
/////////////// EmptyDataTemplate ///////////////////////
if (gridView.Rows.Count == 0)
{
    if (this.GetEmptyDataRow(gridView) != null)
    {
        rows.Clear();
        rows.Add(this.GetEmptyDataRow(gridView));
        gvrc = new GridViewRowCollection(rows);
        WriteRows(writer, gridView, gvrc, "tfoot");
    }
}

....

protected GridViewRow GetEmptyDataRow(GridView gridview)
{
    if (gridview.HasControls())
        if (gridview.Controls[0].HasControls())
        {
            foreach (GridViewRow gvr in gridview.Controls[0].Controls)
            {
               if (gvr.RowType == DataControlRowType.EmptyDataRow)
                   return gvr;
            }
        }

    return null;
}

IMHO, I think should be more flexible create single protected method for each piece of RenderContents code to permit us override what we need and no all the method.

Something like this:

protected override void RenderContents(HtmlTextWriter writer)
{
    if (Extender.AdapterEnabled)
    {
        AdvancedGridView gridView = Control as AdvancedGridView;
        if (gridView != null)
        {
            writer.Indent++;
            WritePagerSection(writer, PagerPosition.Top);

            writer.WriteLine();
            writer.WriteBeginTag("table");
            writer.WriteAttribute("cellpadding", "0");
            writer.WriteAttribute("cellspacing", "0");
            writer.WriteAttribute("summary", Control.ToolTip);

            if (!String.IsNullOrEmpty(gridView.CssClass))
            {
                writer.WriteAttribute("class", gridView.CssClass);
            }

            writer.Write(HtmlTextWriter.TagRightChar);
            writer.Indent++;

            ///////////////////// CAPTION /////////////////////////////
            this.RenderCaption(gridView);

            ///////////////////// HEAD /////////////////////////////
            this.RenderHeader(gridView);

            ///////////////////// FOOT /////////////////////////////
            this.RenderFooter(gridView);

            ///////////////////// EMPTYDATA /////////////////////////////
            this.RenderEmptyData(gridView);

            ///////////////////// BODY /////////////////////////////
            WriteRows(writer, gridView, gridView.Rows, "tbody");

            ////////////////////////////////////////////////////////

            writer.Indent--;
            writer.WriteLine();
            writer.WriteEndTag("table");

            WritePagerSection(writer, PagerPosition.Bottom);

            writer.Indent--;
            writer.WriteLine();

            if (gridView.IsInsertingNewRow)
                gridView.IsInsertingNewRow = false;
        }
    }
    else
    {
        base.RenderContents(writer);
    }
}

protected void RenderCaption(GridView gridView)
{
    if (String.IsNullOrEmpty(gridView.Caption) == false)
    {
        writer.WriteLine();
        writer.WriteBeginTag("caption");
        writer.WriteAttribute("class", "AspNet-GridView-Caption");
        writer.Write(HtmlTextWriter.TagRightChar);
        writer.WriteEncodedText(gridView.Caption);
        writer.WriteEndTag("caption");
    }
}

protected void RenderHeader(GridView gridView)
{
    ArrayList rows = new ArrayList();
    GridViewRowCollection gvrc = null;

    rows.Clear();
    if (gridView.ShowHeader && gridView.HeaderRow != null)
    {
        rows.Add(gridView.HeaderRow);
    }
    gvrc = new GridViewRowCollection(rows);
    WriteRows(writer, gridView, gvrc, "thead");
}

protected void RenderFooter(GridView gridView)
{
    ArrayList rows = new ArrayList();
    GridViewRowCollection gvrc = null;

    rows.Clear();
    if (gridView.ShowFooter && gridView.FooterRow != null)
    {
        rows.Add(gridView.FooterRow);
    }
    gvrc = new GridViewRowCollection(rows);
    WriteRows(writer, gridView, gvrc, "tfoot");
}

protected void RenderEmptyData(GridView gridView)
{
    ArrayList rows = new ArrayList();
    GridViewRowCollection gvrc = null;

    if (gridView.Rows.Count == 0)
    {
        if (this.GetEmptyDataRow(gridView) != null)
        {
            rows.Clear();
            rows.Add(this.GetEmptyDataRow(gridView));
            gvrc = new GridViewRowCollection(rows);
            WriteRows(writer, gridView, gvrc, "tfoot");
        }
    }
}

What do you think?

Hope to see your comments!

Luca Ritossa