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PickObjects Method (ObjectType, ISelectionFilter, String)

Prompts the user to select multiple objects which pass a custom filter while showing a custom status prompt string.

Namespace: Autodesk.Revit.UI.Selection
Assembly: RevitAPIUI (in RevitAPIUI.dll) Version: 2015.0.0.0 (2015.0.0.0)

Syntax

C# 
public IList<Reference> PickObjects(
	ObjectType objectType,
	ISelectionFilter selectionFilter,
	string statusPrompt
)
Visual Basic 
Public Function PickObjects ( _
	objectType As ObjectType, _
	selectionFilter As ISelectionFilter, _
	statusPrompt As String _
) As IList(Of Reference)
Visual C++ 
public:
IList<Reference^>^ PickObjects(
	ObjectType objectType, 
	ISelectionFilter^ selectionFilter, 
	String^ statusPrompt
)

Parameters

objectType
Type: Autodesk.Revit.UI.Selection ObjectType
Specifies the type of object to be selected.
selectionFilter
Type: Autodesk.Revit.UI.Selection ISelectionFilter
The selection filter.
statusPrompt
Type: System String
The message shown on the status bar.

Return Value

A collection of references selected by the user.

Note: if the user cancels the operation (for example, through ESC), the method will throw an OperationCanceledException instance.

Remarks

The user will be shown "Finish" and "Cancel" buttons on the dialog bar to complete the selection operation. Uncheck the "Multiple" check-box to select single object and it will return the selected object directly.

Revit users will be permitted to manipulate the Revit view (zooming, panning, and rotating the view), but will not be permitted to click other items in the Revit user interface. Users are not permitted to switch the active view, close the active document or Revit application in the pick session, otherwise an exception will be thrown.

The selection will not be automatically added to the active selection buffer.

Note: this method must not be called during dynamic update, otherwise ForbiddenForDynamicUpdateException will be thrown.

Examples

Copy C# 
public void SelectPlanarFaces(Autodesk.Revit.DB.Document document)
{
    UIDocument uidoc = new UIDocument(document);
    ISelectionFilter selFilter = new PlanarFacesSelectionFilter(document);
    IList<Reference> faces = uidoc.Selection.PickObjects(ObjectType.Face, selFilter, "Select multiple planar faces");
}

public class PlanarFacesSelectionFilter : ISelectionFilter
{
    Document doc = null;
    public PlanarFacesSelectionFilter(Document document)
    {
        doc = document;
    }

    public bool AllowElement(Element element)
    {
        return true;
    }

    public bool AllowReference(Reference refer, XYZ point)
    {   
        if (doc.GetElement(refer).GetGeometryObjectFromReference(refer) is PlanarFace)
        {
            return true; // Only return true for planar faces. Non-planar faces will not be selectable
        }
        return false;
    }
}
Copy VB.NET 
Public Sub SelectPlanarFaces(document As Autodesk.Revit.DB.Document)
    Dim uidoc As New UIDocument(document)
    Dim selFilter As ISelectionFilter = New PlanarFacesSelectionFilter(document)
    Dim faces As IList(Of Reference) = uidoc.Selection.PickObjects(ObjectType.Face, selFilter, "Select multiple planar faces")
End Sub

Public Class PlanarFacesSelectionFilter
    Implements ISelectionFilter
    Private doc As Document = Nothing
    Public Sub New(document As Document)
        doc = document
    End Sub

    Public Function AllowElement(element As Element) As Boolean Implements ISelectionFilter.AllowElement
        Return True
    End Function

    Public Function AllowReference(refer As Reference, point As XYZ) As Boolean Implements ISelectionFilter.AllowReference
        If TypeOf doc.GetElement(refer).GetGeometryObjectFromReference(refer) Is PlanarFace Then
            ' Only return true for planar faces. Non-planar faces will not be selectable
            Return True
        End If
        Return False
    End Function
End Class

Exceptions

Exception Condition
Autodesk.Revit.Exceptions ArgumentOutOfRangeException Thrown when the objectType is not a recognized value.
Autodesk.Revit.Exceptions ArgumentNullException Thrown when the selectionFilter is a null reference ( Nothing in Visual Basic) or statusPrompt is a null reference ( Nothing in Visual Basic) .
Autodesk.Revit.Exceptions OperationCanceledException Thrown when the Revit user cancelled this operation. Thrown when the Revit user tried to switch the active view, close the active document or Revit application when responding to this mode.
Autodesk.Revit.Exceptions ForbiddenForDynamicUpdateException Thrown if this method is called during dynamic update.

See Also