protected static IContentDisplayer CreateDisplayer(ContentItem item, string templateUrl)
{
if (item == null)
{
return(null);
}
// If the item has a displayer then use that.
IContentDisplayer displayer = ContentManager.GetDisplayer(item);
if (displayer != null)
{
return(displayer);
}
// Return a template displayer for the item.
return(new TemplateContentDisplayer(item, templateUrl ?? ContentManager.GetDisplayerTemplateUrl(item)));
}
private static IContentDisplayer GetContentDisplayer(ContentItem parentItem, string propertyName)
{
// The property on the parent can define how to display the child.
PropertyInfo propertyInfo = parentItem.GetType().GetProperty(propertyName);
if (propertyInfo != null)
{
IContentDisplayer displayer = GetContentDisplayer(parentItem, propertyName, propertyInfo);
if (displayer != null)
{
return(displayer);
}
}
// Look for a property on the parent.
var item = parentItem.Children[propertyName];
return(CreateDisplayer(item));
}
protected void Display()
{
// All derived controls should have had time to set themselves up so get the item to display.
IContentDisplayer displayer = GetContentDisplayer();
if (displayer != null)
{
// Clear away any controls that may already exist as they are going to be replaced by this content.
Controls.Clear();
displayer.AddControls(this);
// If you get an error on the previous step something like:
// "The Controls collection cannot be modified because the control contains code blocks (i.e. <% ... %>)."
// what it probably means is that you have some code blocks in the default content defined on your
// page or in your control, i.e. the controls that get cleared away above. Not sure what the
// underlying problem is but rework the code and move code blocks into the code behind to make it
// all go away or put appropriate runat="server" attributes on outermost div etc elements.
}
}