Metadata API - ASP.NET Dynamic Data - page 202

Presentation Logic Support
Support for presentation logic is, by far, the biggest part of the public interface exposed by
the MetaTable class. Here are the important members to consider:
public virtual IEnumerable<MetaColumn> GetScaffoldColumns(
DataBoundControlMode mode, ContainerType containerType);
The GetScaffoldColumns method is responsible for returning the list of columns that will
be displayed by the default page templates. The containerType parameter specifies
whether the columns are needed for a single item view or a list. The mode parameter speci-
fies whether the current entity is displayed in ReadOnly , Insert , or Edit mode.
public virtual IEnumerable<MetaColumn> GetFilteredColumns();
The GetFilteredColumns method is used by the QueryableFilterRepeater control, which
generates the filter controls in the List and ListDetails page templates.
public string GetActionPath(string action);
public string GetActionPath(string action, IList<object> primaryKeyValues);
public string GetActionPath(string action, object row);
public string GetActionPath(string action,
RouteValueDictionary routeValues);
The GetActionPath method is used whenever a hyperlink is needed to a dynamically
generated page, which includes the DynamicHyperLink control as well as the read-only
ForeignKey field template. In the simplest form, this method takes a single action parame-
ter, which can be any string, but typically comes from one of the strings defined in the
static PageAction class— Insert , Edit , Details , or List . The remaining overloads of the
GetActionPath method are used to specify additional parameter values in the query string.
This could be limited to just the primary key values of a particular row when generating a
link to a single-item page or any column values when generating a link to a prefiltered list
page.
public IList<object> GetPrimaryKeyValues(object row);
The primary key values can be extracted from a row (an entity instance) using the
GetPrimaryKeyValues method. This is how the GetActionPath overload that takes a row
object works.
public IDictionary<string, object> GetColumnValuesFromRoute(
HttpContext context);
public DataKey GetDataKeyFromRoute();