Building Dynamic Forms - ASP.NET Dynamic Data - page 382

LISTING 11.10 Continued
{
Control parent = this.Parent;
while (parent != null)
{
if (parent is GridViewRow ||
parent is FormViewRow ||
parent is DetailsViewRow)
break;
parent = parent.Parent;
}
return parent;
}
private static Control FindControlRecursively(Control parent, string id)
{
Control control = parent.FindControl(id);
if (control != null)
return control;
foreach (Control child in parent.Controls)
{
control = FindControlRecursively(child, id);
if (control != null &&
0 == string.Compare(control.ID, id, StringComparison.OrdinalIgnoreCase))
return control;
}
return null;
}
}
The reimplemented FindOtherFieldTemplate method first tries to call the inherited
version, which succeeds if this field template was created in a custom page and the built-
in logic was sufficient to find the template. If the template was not found, the
FindOtherFieldTemplate first locates the ultimate parent of all field templates of the
current entity. It does that by calling the FindParentOfAllFieldTemplates method, which
walks up the parent chain until it finds a known container, which could be a
GridViewRow , a FormViewRow , or a DetailsViewRow , depending on the type of control used
to create the UI—a GridView , a FormView , or a DetailsView , respectively. Having located
the ultimate parent, the FindOtherFieldTemplate calls the FindControlRecursively
method, which traverses the hierarchy of controls recursively until it finds the target field
template.