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StartWithNewSketch Method

Sketch Edit Scope Start With New Sketch Method

Starts a sketch edit mode for an element which, at this moment, doesn't have a sketch.

Namespace: Autodesk.Revit.DB
Assembly: RevitAPI (in RevitAPI.dll) Version: 25.0.0.0 (25.0.0.0)
Syntax 
public void StartWithNewSketch(
	ElementId elementId
)

Parameters

elementId ElementId
The Element without sketch to be edited.
Exceptions
Exception Condition
ArgumentException The ElementId elementId already has a sketch defined. -or- Element does not support sketch editing. -or- Failed to start the sketch edit mode.
ArgumentNullException A non-optional argument was null
InvalidOperationException This SketchEditScope is not permitted to start at this moment for one of the following possible reasons: The document is in read-only state, or the document is currently modifiable, or there already is another edit mode active in the document. -or- Cannot create sketch.
Remarks
Some surface Revit elements (like some Walls or some Analytical Elements) does not have a valid sketch all the time so in order to edit them, we have to create a valid sketch first. The application will need to start a transaction to actually make changes to the element. SketchEditScope can only be started when there is no transaction active, thus it does not work for commands running in automatic transaction mode.
Example
C# 
Document document = commandData.Application.ActiveUIDocument.Document;

//create analytical panel
AnalyticalPanel analyticalPanel = CreateAnalyticalPanel.CreateAMPanel(document);
if (analyticalPanel != null)
{
   // Start a sketch edit scope
   SketchEditScope sketchEditScope = new SketchEditScope(document, "Replace line with an arc");
   sketchEditScope.StartWithNewSketch(analyticalPanel.Id);

   using (Transaction transaction = new Transaction(document, "Modify sketch"))
   {
      transaction.Start();

      //replace a boundary line with an arc
      Line line = null;
      Sketch sketch = document.GetElement(analyticalPanel.SketchId) as Sketch;
      if (sketch != null)
      {
         foreach (CurveArray curveArray in sketch.Profile)
         {
            foreach (Curve curve in curveArray)
            {
               line = curve as Line;
               if (line != null)
               {
                  break;
               }
            }
            if (line != null)
            {
               break;
            }
         }
      }

      // Create arc
      XYZ normal = line.Direction.CrossProduct(XYZ.BasisZ).Normalize().Negate();
      XYZ middle = line.GetEndPoint(0).Add(line.Direction.Multiply(line.Length / 2));
      Curve arc = Arc.Create(line.GetEndPoint(0), line.GetEndPoint(1), middle.Add(normal.Multiply(20)));

      // Remove element referenced by the found line. 
      document.Delete(line.Reference.ElementId);

      // Model curve creation automatically puts the curve into the sketch, if sketch edit scope is running.
      document.Create.NewModelCurve(arc, sketch.SketchPlane);

      transaction.Commit();
   }

   sketchEditScope.Commit(new FailurePreproccessor());

}

return Result.Succeeded;
See Also