/// <param name="persistantObjectName">Will be used as CustomObject name to get the object instance</param>
public static PageFile GetInstance(ConnectionList connectionList, string connectionID, string persistantObjectName=null, HttpRequest request=null, Func<PageFile> createCallback=null)
{
if( persistantObjectName == null )
{
if( request == null )
throw new ArgumentException( "Either 'fileID' parameter or 'request' must be specified" );
persistantObjectName = request.QueryString[ RqstFileID ];
}
if( string.IsNullOrEmpty(persistantObjectName) )
throw new ArgumentException( "The connection's custom object name could not be determined. Either the 'fileID' parameter must be set or the 'request' must contain the HTTP parameter '" + RqstFileID + "'" );
PageFile instance;
if( createCallback == null )
{
instance = (PageFile)connectionList.GetConnectionCustomObject( connectionID, persistantObjectName );
}
else
{
Func<object> createPageFileCallback = ()=>{ return createCallback(); };
instance = (PageFile)connectionList.GetConnectionCustomObject( connectionID, persistantObjectName, createPageFileCallback );
}
return instance;
}