- element
- An item in the Data Set. The item in the Data Set that immediately precedes this item will be returned.
- tree
- true to evaluate the Data Set as a tree; false to evaluate the Data Set as a list.
Syntax
| Visual Basic (Declaration) | |
|---|---|
Public Function GetPreviousKey( _ 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.GetPreviousKey(element, tree) | |
| C# | |
|---|---|
public DicomElement GetPreviousKey( DicomElement element, bool tree ) | |
| C++/CLI | |
|---|---|
public: DicomElement^ GetPreviousKey( DicomElement^ element, bool tree ) | |
Parameters
- element
- An item in the Data Set. The item in the Data Set that immediately precedes this item will be returned.
- tree
- true to evaluate the Data Set as a tree; false to evaluate the Data Set as a list.
Return Value
The item in the Data Set that immediately precedes the item specified by element, or a null reference (Nothing in Visual Basic) if there is no item preceding element (element is the first item in the Data Set).Example
For an example, refer to Leadtools.Dicom.DicomDataSet.Reset.
Remarks
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 in the following illustration is arbitrary and does not imply order.
| If the passed object points to: | The method returns an object pointing to: |
|---|---|
| Item 1 | Item 2 |
| Item 3 | Item 4 |
| Item 5 | null |
| Item 6 | Item 7 |
If the Data Set is evaluated as a list, the previous item in the list is returned. 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 | null |
| Item 15 | Item 14 |
| Item 5 | Item 4 |
| Item 9 | Item 8 |
| Item 22 | Item 21 |
| Item 25 | Item 24 |
The following methods will also help you navigate the Data Set as either a tree or a list:
If you evaluate the Data Set as a tree, you can also use the following methods to navigate the tree:
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)