This is what you’ll see in the top level of the Watch window. I find the yellow ones useful.

NewsItem

• base Duplicates MyContentItem.
• _parts Duplicate Parts.
• ContentManager
• ContentType A string that names the content type. E.g. “NewsItem”
• Id
• Orchard.ContentManagement.IContent.ContentItem Duplicates MyContentItem.
• Parts Contains all the parts that are attached to this ContentType.
• [0]
• …
• PartDefinition ContentPart`1
• …
• [1]
• …
• PartDefinition FieldIndexPart
• …
• [2]
• …
• PartDefinition TitlePart
• …
• [3]
• …
• PartDefinition BodyPart
• …
• [4]
• …
• PartDefinition CommonPart
• …
• [5]
• …
• PartDefinition NewsItem
• …
• [0]
• …
• PartDefinition AutoroutePart
• …
• [0]
• …
• PartDefinition InfosetPart
• …
• Record
• TypeDefinition
• DisplayName
• Name
• Parts
• [0]
• PartDefinition
• Fields Count = 0
• Name TitlePart
• Settings
• [1]
• PartDefinition
• Fields Count = 0
• Name BodyPart
• Settings
• [2]
• PartDefinition
• Fields Count = 0
• Name CommonPart
• Settings
• [3]
• PartDefinition
• Fields Count = 5 (this has fields because the Part has the same name as the Type).
•  
•  
•  
•  
•  
• Name NewsItem
• Settings
• [4]
• PartDefinition
• Fields Count = 0
• Name AutoroutePart
• Settings
• Version
• VersionRecord
• Dynamic View

Questions

1. What is the type of the Parts property? It appears to be a List of some sort.
2. What is the difference between MyContentItem.Parts and MyContentItem.TypeDefinition.Parts? The former often lists more parts than the latter does.

Resources

http://msdn.microsoft.com/en-us/library/hfw7t1ce%28v=vs.71%29.aspx