Group

Public Class

An element representing a single instance of a group of elements that may be placed many times in a project or family.

Inheritance Hierarchy

System.Object
Autodesk.Revit.DB.Element
Autodesk.Revit.DB.Group

Assembly: RevitAPI (in RevitAPI.dll) Version: 25.0.0.0 (25.0.0.0)

Syntax

public class Group : Element

The Group type exposes the following members.

Properties

Name

Description

Public Property

AssemblyInstanceId

The id of the assembly instance to which the element belongs.
(Inherited from Element)

Public Property

AttachedParentId

Indicates the Id of the parent group this group is attached to.

Public Property
Code Example
BoundingBox

Retrieves a box that circumscribes all geometry of the element.
(Inherited from Element)

Public Property
Category

Retrieves a Category object that represents the category or sub category in which the element resides.
(Inherited from Element)

Public Property
Code Example
CreatedPhaseId

Id of a Phase at which the Element was created.
(Inherited from Element)

Public Property
Code Example
DemolishedPhaseId

Id of a Phase at which the Element was demolished.
(Inherited from Element)

Public Property
Code Example
DesignOption

Returns the design option to which the element belongs.
(Inherited from Element)

Public Property
Document

Returns the Document in which the Element resides.
(Inherited from Element)

Public Property
Code Example
Geometry

Retrieves the geometric representation of the element.
(Inherited from Element)

Public Property

GroupId

The id of the group to which an element belongs.
(Inherited from Element)

Public Property
GroupType

Get or set the type of the group.

Public Property
Code Example
Id

A unique identifier for an Element in an Autodesk Revit project.
(Inherited from Element)

Public Property

IsAttached

Indicates wether or not this group is attached to a parent group.

Public Property
IsModifiable

Identifies if the element is modifiable.
(Inherited from Element)

Public Property
IsTransient

Indicates whether an element is transient or permanent.
(Inherited from Element)

Public Property
IsValidObject

Specifies whether the .NET object represents a valid Revit entity.
(Inherited from Element)

Public Property

LevelId

The id of the level associated with the element.
(Inherited from Element)

Public Property
Location

This property is used to find the physical location of a group within project.
(Overrides Element.Location)

Public Property
Name

A human readable name for the Element.
(Inherited from Element)

Public Property

OwnerViewId

The id of the view that owns the element.
(Inherited from Element)

Public Property
Code Example
Parameter.BuiltInParameter.

Retrieves a parameter from the element given a parameter id.
(Inherited from Element)

Public Property
Parameter.Definition.

Retrieves a parameter from the element based on its definition.
(Inherited from Element)

Public Property
Parameter.Guid.

Retrieves a parameter from the element given a GUID for a shared parameter.
(Inherited from Element)

Public Property
Code Example
Parameters

Retrieves a set containing all of the parameters that are contained within the element.
(Inherited from Element)

Public Property
ParametersMap

Retrieves a map containing all of the parameters that are contained within the element.
(Inherited from Element)

Public Property
Pinned

Identifies if the element has been pinned to prevent changes.
(Inherited from Element)

Public Property
Code Example
UniqueId

A stable unique identifier for an element within the document.
(Inherited from Element)

Public Property
VersionGuid

Get the element version Guid.
(Inherited from Element)

Public Property

ViewSpecific

Identifies if the element is owned by a view.
(Inherited from Element)

Public Property
WorksetId

Get Id of the Workset which owns the element.
(Inherited from Element)

Methods

Name

Description

Public Method
ArePhasesModifiable

Returns true if the properties CreatedPhaseId and DemolishedPhaseId can be modified for this Element.
(Inherited from Element)

Public Method
CanBeHidden

Indicates if the element can be hidden in the view.
(Inherited from Element)

Public Method

CanBeLocked

Identifies if the element can be locked.
(Inherited from Element)

Public Method

CanDeleteSubelement

Checks if given subelement can be removed from the element.
(Inherited from Element)

Public Method
CanHaveTypeAssigned.

Identifies if the element can have a type assigned.
(Inherited from Element)

Public Method
ChangeTypeId(ElementId)

Changes the type of the element.
(Inherited from Element)

Public Method

DeleteEntity

Deletes the existing entity created by %schema% in the element
(Inherited from Element)

Public Method
DeleteSubelement

Removes a subelement from the element.
(Inherited from Element)

Public Method
DeleteSubelements

Removes the subelements from the element.
(Inherited from Element)

Public Method

Dispose

(Inherited from Element)

Public Method

Equals

Determines whether the specified object is equal to the current object.
(Inherited from Object)

Public Method

EvaluateAllParameterValues

Evaluates all the parameters’ values of the element.
(Inherited from Element)

Public Method

EvaluateParameterValues

Evaluate the parameters’ values of the element on the given parameter ID set.
(Inherited from Element)

Public Method

GetAvailableAttachedDetailGroupTypeIds

Returns the attached detail groups available for this group type.

Public Method
GetDependentElements

Get all elements that, from a logical point of view, are the children of this Element.
(Inherited from Element)

Public Method
GetEntity

Returns the existing entity corresponding to the Schema if it has been saved in the Element, or an invalid entity otherwise.
(Inherited from Element)

Public Method

GetEntitySchemaGuids

Returns the Schema guids of any Entities stored in this element.
(Inherited from Element)

Public Method

GetExternalFileReference

Gets information pertaining to the external file referenced by the element.
(Inherited from Element)

Public Method
GetExternalResourceReference

Gets the ExternalResourceReference associated with a specified external resource type.
(Inherited from Element)

Public Method
GetExternalResourceReferenceExpanded

Gets the collection of ExternalResourceReference associated with a specified external resource type.
(Inherited from Element)

Public Method
GetExternalResourceReferences

Gets the map of the external resource references referenced by the element.
(Inherited from Element)

Public Method
GetExternalResourceReferencesExpanded

Gets the expanded map of the external resource references referenced by the element.
(Inherited from Element)

Public Method
Code Example
GetGeneratingElementIds

Returns the ids of the element(s) that generated the input geometry object.
(Inherited from Element)

Public Method
GetGeometryObjectFromReference

Retrieve one geometric primitive contained in the element given a reference.
(Inherited from Element)

Public Method

GetHashCode

Serves as the default hash function.
(Inherited from Object)

Public Method

GetMaterialArea

Gets the area of the material with the given id.
(Inherited from Element)

Public Method
GetMaterialIds

Gets the element ids of all materials present in the element.
(Inherited from Element)

Public Method

GetMaterialVolume

Gets the volume of the material with the given id.
(Inherited from Element)

Public Method

GetMemberIds

Retrieves all the member ElementIds of the group.

Public Method

GetMonitoredLinkElementIds

Provides the link instance IDs when the element is monitoring.
(Inherited from Element)

Public Method

GetMonitoredLocalElementIds

Provides the local element IDs when the element is monitoring.
(Inherited from Element)

Public Method
GetOrderedParameters

Gets the parameters associated to the element in order.
(Inherited from Element)

Public Method
GetParameter

Retrieves a parameter from the element given identifier.
(Inherited from Element)

Public Method

GetParameterFormatOptions

Returns a FormatOptions override for the element Parameter, or a default FormatOptions if no override exists.
(Inherited from Element)

Public Method
GetParameters

Retrieves the parameters from the element via the given name.
(Inherited from Element)

Public Method

GetPhaseStatus

Gets the status of a given element in the input phase
(Inherited from Element)

Public Method

GetShownAttachedDetailGroupTypeIds

Returns the attached detail groups which have displayed instances for this group type in the input view.

Public Method
GetSubelements

Returns the collection of element subelements.
(Inherited from Element)

Public Method

GetType

Gets the Type of the current instance.
(Inherited from Object)

Public Method
Code Example
GetTypeId

Returns the identifier of this element’s type.
(Inherited from Element)

Public Method

GetValidTypes.

Obtains a set of types that are valid for this element.
(Inherited from Element)

Public Method
HasPhases

Returns true if this Element has the properties CreatedPhaseId and DemolishedPhaseId.
(Inherited from Element)

Public Method

HideAllAttachedDetailGroups

Hides all the available attached detail groups for this element group type that are compatible with the input view type.

Public Method

HideAttachedDetailGroups

Hides the element group’s attached detail groups of the input group type that are compatible with the input view.

Public Method
IsCompatibleAttachedDetailGroupType

Checks if the orientation of the input attached detail group matches the input view’s orientation.

Public Method

IsCreatedPhaseOrderValid

Returns true if createdPhaseId and demolishedPhaseId are in order.
(Inherited from Element)

Public Method

IsDemolishedPhaseOrderValid

Returns true if createdPhaseId and demolishedPhaseId are in order.
(Inherited from Element)

Public Method
IsExternalFileReference

Determines whether this Element represents an external file.
(Inherited from Element)

Public Method
IsHidden

Identifies if the element has been permanently hidden in the view.
(Inherited from Element)

Public Method

IsMonitoringLinkElement

Indicate whether an element is monitoring any elements in any linked models.
(Inherited from Element)

Public Method

IsMonitoringLocalElement

Indicate whether an element is monitoring other local elements.
(Inherited from Element)

Public Method
IsPhaseCreatedValid

Returns true if createdPhaseId is an allowed value for the property CreatedPhaseId in this Element.
(Inherited from Element)

Public Method
IsPhaseDemolishedValid

Returns true if demolishedPhaseId is an allowed value for the property DemolishedPhaseId in this Element.
(Inherited from Element)

Public Method
IsValidType(ElementId)

Checks if given type is valid for this element.
(Inherited from Element)

Public Method
LookupParameter

Attempts to find a parameter on the element which has the given name.
(Inherited from Element)

Public Method

RefersToExternalResourceReference

Determines whether this Element uses external resources associated with a specified external resource type.
(Inherited from Element)

Public Method
RefersToExternalResourceReferences

Determines whether this Element uses external resources.
(Inherited from Element)

Public Method

SetEntity

Stores the entity in the element. If an Entity described by the same Schema already exists, it is overwritten.
(Inherited from Element)

Public Method
ShowAllAttachedDetailGroups

Shows all the available attached detail groups for this element group type that are compatible with the input view type.

Public Method
ShowAttachedDetailGroups

Shows the element group’s attached detail groups of the input group type that are compatible with the input view.

Public Method

ToString

Returns a string that represents the current object.
(Inherited from Object)

Public Method
UngroupMembers

Ungroups the group.

Remarks

Grouping elements is useful when you need to create entities that represent repeating layouts or are common to many building projects, such as hotel rooms, apartments, or repeating floors.

Example

private void ShowGroupInformation(Autodesk.Revit.DB.Document document, Autodesk.Revit.DB.Element element)
{
    // Get group information for the selected element
    String prompt = null;
    if (element.GroupId.Equals(ElementId.InvalidElementId))
    {
        prompt = "The element isn't in any group.";
    }
    else
    {
       Autodesk.Revit.DB.Group group = document.GetElement(element.GroupId) as Autodesk.Revit.DB.Group;

        prompt = "The element " + element.Id.ToString() + " is in a group.";
        prompt += "\nThe group id is " + group.Id.ToString();
        prompt += "\nThe group's category is " + group.Category.Name;
        prompt += "\nAll group contained element ids are:";
        IList<ElementId> memberIds = group.GetMemberIds();
        foreach (ElementId id in memberIds)
        {
            prompt += "\n\t" + id.ToString();
        }
    }

    TaskDialog.Show("Revit",prompt);
}

// Change the default group name to a new name �MyGroup�
group.GroupType.Name = "MyGroup";

public void GetInfo_Group(Group group)
{
    string message = "Group : ";

    // Show the group type name
    message += "\nGroup type name is : " + group.GroupType.Name;

    // Show the name of the elements contained in the group
    message += "\nThe members contained in this group are:";
    IList<ElementId> groupMembers = group.GetMemberIds();
    foreach (ElementId memberId in groupMembers)
    {

        message += "\n\tGroup member id : " + memberId.ToString();
    }

    message += "\nAll member will now be removed from group.";
    group.UngroupMembers();

    TaskDialog.Show("Revit",message);
}