To get all currently selected diagram items, use the SelectedItems property of the page's selection:

NList<NDiagramItem> selectedItems = page.Selection.SelectedItems;

To check if any shapes (NShape instances) are selected, use the HasShapes property of the page's selection - it checks whether at least one of the currently selected diagram items is a shape (NShape):

if (page.Selection.HasShapes)
{
    // Your code here
}

The page's Selection object provides the following methods for selecting shapes and other diagram items.

• SingleSelect - makes the specified item or list of items the only selected items.

  Make a shape the only selected item	Copy Code
  page.Selection.SingleSelect(myShape);

• MultiSelect - appends the given item or list of items to the current page selection without removing the currently selected items.
• ToggleSelect - toggles the selection of the given item or list of items, i.e. if the items were not selected, this method selects them and vice versa.
• SelectAll - selects all 1D, all 2D or all shapes in the page based on the specified parameter. The following code shows how to select all 2D shapes in a page:

  Select all 2D shapes	Copy Code
  NPage page = drawingView.ActivePage; page.Selection.SelectAll(ENSelectAllFilter.Shapes2D);

To deselect shapes, use the following method of the shape:

• Deselect - deselects one or more diagram items.
• DeselectAll - deselects all diagram items.

The page selection provides the following properties:

• Mode - defines the selection mode. Can be Single or Multiple.
• SelectedCount - gets the number of currently selected items.
• SelectedItems - gets the list of currently selected items.
• HasShapes - indicates whether the page selections contains any shapes.
• AlignmentAnhor - gets the node towards which alignment commands are executed.
• AlignmentAnchorMode - defines the alignment anchor mode. By default the last selected shape is the alignment anchor.
• FormatAnchor - gets the node towards which formatting commands are executed.
• FormatAnchorMode - defines the formatting anchor mode. By default the last selected shape is the format anchor.
• BatchDelete - gets a batch, whose Delete method can be used to delete all currently selected shapes.

  C#	Copy Code
  if (page.Selection.BatchDelete.CanDelete()) { page.Selection.BatchDelete.Delete(); }

• BatchGroup - gets a batch, whose Group method can be used to group all currently selected shapes.

  C#	Copy Code
  if (page.Selection.BatchGroup.CanGroup()) { NGroup group; page.Selection.BatchGroup.Group(page, out group); }

For more information about batches open the Diagram Batches topic.

The page selection also provides the following methods:

• IsSelected - check whether the given diagram item is selected.
• GetBounds - gets the selection bounds in page coordinates.