MoveFirstElement method

Builder Syntax	int __fastcall MoveFirstElement(bool bTree);
Delphi Syntax	function MoveFirstElement(bTree: Boolean): Integer;
Overview	Refer to Working with Data Sets.

Remarks

Updates the CurrentElement property to the first item in the Data Set. The result depends on whether the Data Set is evaluated as a list or a tree.

If the Data Set is evaluated as a tree structure, this method updates the CurrentElement property with the first item on the same level and with the same parent as the item contained in the CurrentElement property. Please note that the numbering of the items in this first illustration is arbitrary and does not imply order.

$image\GetFstTr.gif$

If the CurrentElement property contains:	The CurrentElement property will be updated with:
Item 1	Item 2
Item 3	Item 4
Item 5	Item 5
Item 6	Item 7
Nil (NULL)	Item 2

If the Data Set is evaluated as a list, the CurrentElement property is updated with the first item in the list. Please note that the numbering of the items in this illustration does indicate the order of the items when the Data Set is evaluated as a list.

$image\GetFtLst.gif$

If the CurrentElement property contains:	The CurrentElement property will be updated with:
Nil (NULL)	Item 1
Item 12	Item 1
Item 14	Item 1
Item 22	Item 1
Item 25	Item 1

The following methods will also help you navigate the Data Set as either a tree or a list:

MoveGetLastElement method

MovePrevElement method

MoveNextElement method

If you evaluate the Data Set as a tree, you can also use the following methods to navigate the tree:

MoveRootElement method

MoveParentElement method

MoveChildElement method

Note: You can either check the return value of the method, or capture and process errors to determine whether the MovexxxElement methods have completed successfully. For an example of capturing errors, refer to any of the MovexxxElement method examples.