_Items.SetColumns(String) Method

Definition

Namespace:

Microsoft.Office.Interop.Outlook

Assembly:

Microsoft.Office.Interop.Outlook.dll

Caches certain properties for extremely fast access to those particular properties of an item within the collection.

public:
 void SetColumns(System::String ^ Columns);

public void SetColumns (string Columns);

Public Sub SetColumns (Columns As String)

Parameters

Columns

String

A string that contains the names of the properties to cache. The property names are delimited by commas in this string.

Remarks

The SetColumns method is useful for iterating through the Items collection. If you don't use this method, Microsoft Outlook must open each item to access the property. With the SetColumns method, Outlook only checks the properties that you have cached, and provides fast, read-only access to these properties.

After applying the SetColumns method on specific properties of the collection, you cannot read other properties of that collection; properties which are not cached are returned empty. You cannot write to any of the properties of that collection either. Alternatively, if you require read-write, fast access to a set of items, use the Table object.

SetColumns cannot be used, and will cause an error, with any property that returns an object. It cannot be used with the following properties:

	AutoResolvedWinner	InternetCodePage
	Body	MeetingWorkspaceURL
	BodyFormat	MemberCount
	Categories	ReceivedByEntryID
	Children	ReceivedOnBehalfOfEntryID
	Class	RecurrenceState
	Companies	ReplyRecipients
	DLName	ResponseState
	DownloadState	Saved
	EntryID	Sent
	HTMLBody	Submitted
	IsConflict	VotingOptions

The ConversationIndex property cannot be cached using the SetColumns method. However, this property will not result in an error like the other properties listed above.