SendBackward(GraphicsLayer,IEnumerable<Element>) Method

In This Topic

Send the elements backward within their parent's element collection. This method must be called on the MCT. Use QueuedTask.Run.

Syntax

C#
Visual Basic (Declaration)

public static void SendBackward( 
   GraphicsLayer graphicsLayer,
   IEnumerable<Element> elements
)

Public Overloads Shared Sub SendBackward( _
   ByVal graphicsLayer As GraphicsLayer, _
   ByVal elements As IEnumerable(Of Element) _
)

Parameters

graphicsLayer
elements: The elements to send backward

Exceptions

Exception	Description
ArcGIS.Core.CalledOnWrongThreadException	This method or property must be called within the lambda passed to QueuedTask.Run.
System.ArgumentException	elements cannot be null or empty
System.ArgumentException	elements must belong to graphicsLayer
System.ArgumentException	element parents must be the same and non-null

Remarks

Refer to CanSendBackward(GraphicsLayer,IEnumerable<Element>) to check whether the elements can be sent backward. Element z order can only be changed relative to their parent's element collection. All elements must have the same parent. The bottom element will have a z order of 0 within the element parent's element collection. Check individual element z order with ArcGIS.Desktop.Layouts.Element.ZOrder.
The map view displaying the graphics layer should be initialized.

Example

Ordering: Send backward and Bring forward

//On the QueuedTask
//get the current selection set
var sel_elems = graphicsLayer.GetSelectedElements();
//can they be brought forward? This will also check that all elements have the same parent
if (graphicsLayer.CanBringForward(sel_elems))
{
  //bring forward
  graphicsLayer.BringForward(sel_elems);
  //bring to front (of parent)
  //graphicsLayer.BringToFront(sel_elems);
}
else if (graphicsLayer.CanSendBackward(sel_elems))
{
  //send back
  graphicsLayer.SendBackward(sel_elems);
  //send to the back (of parent)
  //graphicsLayer.SendToBack(sel_elems);
}

Ordering: Send backward and Bring forward

//On the QueuedTask
//get the current selection set
var sel_elems = graphicsLayer.GetSelectedElements();
//can they be brought forward? This will also check that all elements have the same parent
if (graphicsLayer.CanBringForward(sel_elems))
{
  //bring forward
  graphicsLayer.BringForward(sel_elems);
  //bring to front (of parent)
  //graphicsLayer.BringToFront(sel_elems);
}
else if (graphicsLayer.CanSendBackward(sel_elems))
{
  //send back
  graphicsLayer.SendBackward(sel_elems);
  //send to the back (of parent)
  //graphicsLayer.SendToBack(sel_elems);
}

Requirements

Target Platforms: Windows 11, Windows 10, Windows 8.1

Reference

GraphicsLayerExtensions Class
GraphicsLayerExtensions Members
Overload List

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