FindPreviousElement Method

Visual Basic
C#
WinRT C#
Objective-C
Java
WinRT JavaScript
C++

public DicomElement FindPreviousElement( 
   DicomElement element,
   bool tree
)

'Declaration
 
Public Function FindPreviousElement( _
   ByVal element As DicomElement, _
   ByVal tree As Boolean _
) As DicomElement

'Usage
 
Dim instance As DicomDataSet
Dim element As DicomElement
Dim tree As Boolean
Dim value As DicomElement
 
value = instance.FindPreviousElement(element, tree)

public DicomElement FindPreviousElement( 
   DicomElement element,
   bool tree
)

ObjectiveC Syntax

 function Leadtools.Dicom.DicomDataSet.FindPreviousElement( 
   element ,
   tree 
)

public:
DicomElement^ FindPreviousElement( 
   DicomElement^ element,
   bool tree
)

Parameters

element: An item in the Data Set.
tree: true to evaluate the Data Set as a tree; false to evaluate the Data Set as a list.

Return Value

The previous item in the Data Set with a specified Tag, or a null reference (Nothing in Visual Basic) if a previous item with the specified Tag was not found.

Note: This method does not specify a Tag to use when searching. However the Tag that was used in the last call to FindFirstElement or FindLastElement is used by default when searching.

For the sake of the following illustrations, the order of siblings is top to bottom.

If the Data Set is evaluated as a tree structure, this method returns the previous item on the same level as element, with the same parent as element.

Please note that the numbering of the items of interest in this first illustration is arbitrary and does not imply order.

If the passed object points to:	The method returns an object pointing to:
Item 1	The previous sibling (same level, same parent) of Item 1 , if such an item exists. If such an item does not exist, the method returns null.
Item 2	The previous sibling (same level, same parent) of Item 2 , if such an item exists. If such an item does not exist, the method returns null.
Item 3	The previous sibling (same level, same parent) of Item 3, if such an item exists. If such an item does not exist, the method returns null.

If the Data Set is evaluated as a list, this method returns the previous item in the entire list .

Please note that the numbering of the items in the following illustration does indicate the order of the items when the Data Set is evaluated as a list.

If the passed object points to:	The method returns an object pointing to:
Item 1	The previous item in the list, if such an item exists. If an item with Tag tag is not found, null is returned.
Item 14	The previous item in the list that has Tag tag, if such an item exists. If an item with Tag tag is not found, null is returned.
Item 22	The previous item in the list that has Tag tag, if such an item exists. If an item with Tag tag is not found, null is returned.

The following methods will also help you find elements in the Data Set with a specific Tag:

FindFirstElement

FindLastElement

FindNextElement

The following methods will help you find specific modules in the Data Set:

FindModule

FindModuleByIndex

For an example, refer to Load(String,DicomDataSetLoadFlags).

Target Platforms: Windows 7, Windows Vista SP1 or later, Windows XP SP3, Windows Server 2008 (Server Core not supported), Windows Server 2008 R2 (Server Core supported with SP1 or later), Windows Server 2003 SP2

Reference

DicomDataSet Class
DicomDataSet Members
FindFirstElement Method
FindLastElement Method
FindNextElement Method
FindModule Method
FindModuleByIndex Method