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FindPreviousElement Method
See Also 
Leadtools.Dicom Namespace > DicomDataSet Class : FindPreviousElement Method



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.
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.
Returns the previous item in the Data Set with a specific Tag. Supported in Silverlight, Windows Phone 7.

Syntax

Visual Basic (Declaration) 
Public Function FindPreviousElement( _
   ByVal element As DicomElement, _
   ByVal tree As Boolean _
) As DicomElement
Visual Basic (Usage)Copy Code
Dim instance As DicomDataSet
Dim element As DicomElement
Dim tree As Boolean
Dim value As DicomElement
 
value = instance.FindPreviousElement(element, tree)
C# 
public DicomElement FindPreviousElement( 
   DicomElement element,
   bool tree
)
C++/CLI 
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.

Example

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

Remarks

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 Leadtools.Dicom.DicomDataSet.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, that has Tag tag.

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 that has Tag tag, 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 that has Tag tag, 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 that has Tag tag, 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 that has Tag tag.

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 that has Tag tag, 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

Leadtools.Dicom.DicomDataSet.FindLastElement

Leadtools.Dicom.DicomDataSet.FindNextElement

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

Leadtools.Dicom.DicomDataSet.FindModule

Leadtools.Dicom.DicomDataSet.FindModuleByIndex

Requirements

Target Platforms: Silverlight 3.0, Windows XP, Windows Server 2003 family, Windows Server 2008 family, Windows Vista, Windows 7, MAC OS/X (Intel Only)

See Also

Leadtools.Dicom requires a Medical toolkit server license and unlock key. For more information, refer to: Imaging Pro/Document/Medical Features