Gets a hash table that represents the task’s extended properties collection.
Assembly: Microsoft.SharePoint (in Microsoft.SharePoint.dll)
Available in Sandboxed Solutions: Yes
Available in SharePoint Online
The argument to the task parameter is a null reference (Nothing in Visual Basic).
This method expects that the list item that is passed as an argument to the task parameter has a field with an ID that is SPBuiltInFieldId.ExtendedProperties and that the value of the field is a set of name-value pairs that conform to attributes on an XML element. Those name-value pairs are returned as a hash table when the GetExtendedPropertiesAsHashtable method is called.