Syntax
| Visual Basic (Declaration) | |
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Public Function FindPreviousKey( _ ByVal element As DicomElement, _ ByVal tree As Boolean _ ) As DicomElement | |
| Visual Basic (Usage) |  Copy Code |
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| |
| C# | |
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public DicomElement FindPreviousKey( DicomElement element, bool tree ) | |
| Managed Extensions for C++ | |
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public: DicomElement* FindPreviousKey( DicomElement* element, bool tree ) | |
| C++/CLI | |
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public: DicomElement^ FindPreviousKey( 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 key element type, or a null reference (Nothing in Visual Basic) if a previous item with the specified key element type was not found.Example
Remarks
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 key element type key.
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 key element type key, 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 key element type key, 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 key element type key, 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 key element type key.
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 key element type key, if such an item exists. If an item with key element type key is not found, null is returned. |
| Item 14 | The previous item in the list that has key element type key, if such an item exists. If an item with key element type key is not found, null is returned. |
| Item 22 | The previous item in the list that has key element type key, if such an item exists. If an item with key element type key is not found, null is returned. |
The following methods will also help you find elements in the Data Set with a specific key element type:
Requirements
Target Platforms: Microsoft .NET Framework 2.0, Windows 98, Windows NT 4.0, Windows Millennium Edition, Windows 2000, Windows XP Home Edition, Windows XP Professional, Windows Server 2003 family