Element.Id

Public Property

A unique identifier for an Element in an Autodesk Revit project.

Namespace: Autodesk.Revit.DB

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

Syntax

public ElementId Id { get; }

Property Value

ElementId

Remarks

Returns an object containing the project-wide unique identifier for this Element. The identifier with this id is only unique for the project, it is not unique across separate Autodesk Revit projects.

Example

private void CheckElementId(Autodesk.Revit.DB.Document document, Autodesk.Revit.DB.Element element)
{
    // Get the id of the element
    Autodesk.Revit.DB.ElementId selectedId = element.Id;
    long idValue = selectedId.Value;

    // create a new id and set the value
    Autodesk.Revit.DB.ElementId id = new Autodesk.Revit.DB.ElementId(idValue);

    // Get the element
    Autodesk.Revit.DB.Element first = document.GetElement(id);

    // And get the element using the original Id (they should be the same)
    Autodesk.Revit.DB.Element second = document.GetElement(selectedId);

    String prompt = "Get an element twice. They should be the same element.";
    // Use the Equal method to check two elements. It is not a good way.
    bool isSame = first.Equals(second);
    prompt += "\nUsing Equal method on elements, the result is: " + isSame;
    isSame = first.Id.Equals(second.Id);
    prompt += "\nUsing Equal method on element's Id properties, the result is: " + isSame;

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