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Create Method

Independent Tag Create(Document, Element Id, Reference, Boolean, Tag Mode, Tag Orientation, XYZ) Method

Places a tag on an element or subelement.

Namespace: Autodesk.Revit.DB
Assembly: RevitAPI (in RevitAPI.dll) Version: 25.0.0.0 (25.0.0.0)
Syntax 
public static IndependentTag Create(
	Document document,
	ElementId ownerDBViewId,
	Reference referenceToTag,
	bool addLeader,
	TagMode tagMode,
	TagOrientation tagOrientation,
	XYZ pnt
)

Parameters

document Document
The document to which the tag will be added.
ownerDBViewId ElementId
The view in which the tag will be visible.
referenceToTag Reference
The host reference of the tag. The reference can be to an element or subelement in a local or linked document.
addLeader Boolean
When true, the tag will be created with a straight leader with an attached end.
tagMode TagMode
This argument determines the type of tag that will be created. Tag by category, multi-category tag, and material tag are allowed.
tagOrientation TagOrientation
The orientation of the tag's head.
pnt XYZ
For tags without leaders, this point is the position of the tag head. For tags with leaders, this point is the end point of the leader, and a leader of default length will be created from this point to the tag head.

Return Value

IndependentTag
If successful the new tag is returned.
Exceptions
Exception Condition
ArgumentException The ElementId ownerDBViewId does not correspond to a View. -or- The ElementId ownerDBViewId is a view template. -or- The ElementId ownerDBViewId is a perspective view. -or- The 3D view ownerDBViewId is not locked. -or- The reference can not be tagged.
ArgumentNullException A non-optional argument was null
ArgumentOutOfRangeException A value passed for an enumeration argument is not a member of that enumeration
InternalException Tag creation failed.
InvalidOperationException There is no loaded tag type that can be used when tagging referenceToTag with tagMode.
ModificationForbiddenException The document is in failure mode: an operation has failed, and Revit requires the user to either cancel the operation or fix the problem (usually by deleting certain elements). -or- The document is being loaded, or is in the midst of another sensitive process.
ModificationOutsideTransactionException The document has no open transaction.
Remarks
Single category tags, multi-category tags and material tags can be placed.
Example 
private IndependentTag CreateIndependentTag(Autodesk.Revit.DB.Document document, Wall wall)
{
    // make sure active view is not a 3D view
    Autodesk.Revit.DB.View view = document.ActiveView;

    // define tag mode and tag orientation for new tag
    TagMode tagMode = TagMode.TM_ADDBY_CATEGORY;
    TagOrientation tagorn = TagOrientation.Horizontal;

    // Add the tag to the middle of the wall
    LocationCurve wallLoc = wall.Location as LocationCurve;
    XYZ wallStart = wallLoc.Curve.GetEndPoint(0);
    XYZ wallEnd = wallLoc.Curve.GetEndPoint(1);
    XYZ wallMid = wallLoc.Curve.Evaluate(0.5, true);
    Reference wallRef = new Reference(wall);

    IndependentTag newTag = IndependentTag.Create(document, view.Id,  wallRef, true, tagMode, tagorn, wallMid);
    if (null == newTag)
    {
        throw new Exception("Create IndependentTag Failed.");
    }

    // newTag.TagText is read-only, so we change the Type Mark type parameter to 
    // set the tag text.  The label parameter for the tag family determines
    // what type parameter is used for the tag text.

    WallType type = wall.WallType;

    Parameter foundParameter = type.LookupParameter("Type Mark");
    bool result = foundParameter.Set("Hello");

    // set leader mode free
    // otherwise leader end point move with elbow point

    newTag.LeaderEndCondition = LeaderEndCondition.Free;
    XYZ elbowPnt = wallMid + new XYZ(5.0, 5.0, 0.0);
    newTag.SetLeaderElbow(wallRef, elbowPnt);
    XYZ headerPnt = wallMid + new XYZ(10.0, 10.0, 0.0);
    newTag.TagHeadPosition = headerPnt;

    // change tag orientation to AnyModelDirection
    newTag.TagOrientation = TagOrientation.AnyModelDirection;

    // change tag rotation angle to PI/4
    newTag.RotationAngle = Math.PI / 4;

    return newTag;
}
See Also