Row Indexing

The grid has two row indexing system. Grid.Rows performs linear indexing of visible rows in a grid without regard to hierarchy. It means that this collection contains all visible (not filtered and non-collapsed by parent) rows. Row.VisibleIndex property specifies position of a visible row in Grid.Rows. The second time of indexing is related to hierarchical structure of the grid. Rows at the first hierarchy level can be accessed with Grid.Nodes property. This collection contains both visible and invisible rows that are cocated on the same hierarchy level. Every row may contain child rows that can be accessed via Row.Children property. Neither filtering, nor visibility affect row presence in this collection. Row.ChildIndex property defines hierarchical position of a row If the row is on the top level, it is in Grid.Nodes, otherwise it is in parent Row.Children container. The row also has Row.VisibleChildren container that contains only visible children on the same hierarchy level. You can use Row.VisibleChildIndex property to determine Row position in Row.VisibleChildren of the parent.

One row can be present in different containers, including Grid.Rows, Grid.Nodes, Row.Children, etc. Containers organize grid structure and enable precise definition of data location. For hierarchies the grid provides a convenient API that can be used to determine parent, children and adjacent visible rows. The list of most frequent methods and properties used for data indexing is provided below.

Property or methodDescription
Grid.RowsCollection of all visible rows in the grid.
Grid.NodesCollection of both visible and invisible rows at the top hierarchy level
Row.ChildrenCollection of both visible and invisible children
Row.VisibleChildrenCollection of visible children on the same hierarchy level
Row.ParentParent row or null if the current row is on the top hierarchy level.
Row.VisibleIndexRow position in Grid.Rows
Row.ChildIndexRow position in Grid.Nodes or parent Row.Children
Row.VisibleChildIndexRow position in parent Row.VisibleChildren
Row.NextVisibleNext visible row in parent Row.VisibleChildren container
Row.PrevVisiblePrevious visible row in parent Row.VisibleChildren container
Row.FirstVisibleChildFirst visible child
Row.LastVisibleChildLast visible child
Grid.Rows.TopVisibleRowThe first row in visible area of the grid
Grid.Rows.BottomVisibleRowThe last row that is at least partially visible in the visible area of the grid
Grid.Rows.BottomFullyVisibleRowThe last fully visible row in the visible area of the grid

If you work with reference-type data objects, you can use convenient grid features to search row or rows that contain the required data object.

You can get a data object that is associated with a row by calling Row.DataObject property. The same data object may be contained in multiple grid rows. You can get them using Grid.DataObjects.Find(object) method. If you need only the first row, you can use Grid.DataObjects.FindFirstRow(object) method.


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