SendBackward(GraphicsLayer,Element) Method

In This Topic

Send the element backward within its 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,
   Element element
)

Public Overloads Shared Sub SendBackward( _
   ByVal graphicsLayer As GraphicsLayer, _
   ByVal element As Element _
)

Parameters

graphicsLayer
element: The element to send backward

Exceptions

Exception	Description
ArcGIS.Core.CalledOnWrongThreadException	This method or property must be called within the lambda passed to QueuedTask.Run.
System.ArgumentNullException	Value cannot be null: element
System.ArgumentException	elements must belong to graphicsLayer

Remarks

Refer to CanSendBackward(GraphicsLayer,Element) to check whether an element can be sent backward. Element z order can only be changed relative to its parent's element collection. The bottom element will have a z order of 0 within the element parent's element collection. Check 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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