PostAsListRenderer.cs

public class PostAsListRenderer<T> : HtmlTableGridRenderer<T> where T : class
{
    private readonly string _collectionName;
    private string _previousHtmlFieldPrefix;
    Guid _currentIndex;
    bool _firstCellRendered;

    public PostAsListRenderer(string collectionName)
    {
        _collectionName = collectionName;
    }

    protected override void RenderStartCell(GridColumn<T> column, GridRowViewData<T> rowData)
    {
        string attrs = BuildHtmlAttributes(column.Attributes(rowData));
        if (attrs.Length > 0)
            attrs = " " + attrs;

        var hidden = string.Empty;
        if (!_firstCellRendered)
        {
            hidden = string.Format("<input type=\"hidden\" name=\"{0}.index\" value=\"{1}\" />", _collectionName, _currentIndex);    
        }

        _firstCellRendered = true;
        
        RenderText(string.Format("<td{0}>{1}", attrs, hidden));
    }

    protected override void RenderRowStart(GridRowViewData<T> rowData)
    {
        _firstCellRendered = false;
        _currentIndex = Guid.NewGuid();
        
        Context.ViewData.TemplateInfo.HtmlFieldPrefix = string.Format("{0}[{1}]", _collectionName, _currentIndex);
        
        base.RenderRowStart(rowData);
    }

    protected override void RenderGridStart()
    {
        _previousHtmlFieldPrefix = Context.ViewData.TemplateInfo.HtmlFieldPrefix;
        
       base.RenderGridStart();
    }

    protected override void RenderGridEnd(bool isEmpty)
    {
        Context.ViewData.TemplateInfo.HtmlFieldPrefix = _previousHtmlFieldPrefix;
        base.RenderGridEnd(isEmpty);
    }
}