Editing Existing Dimensions

[strsuraj]

Hello everyone,

I am using Revit 2015 and VS 2013.

I want to change few properties of the existing dimension like "Witness Line Control" from -> Fixed to Dimension Line to "Gap to Element". 

This is what I have done so far, but didn't really gave me the results intended. I am able to change the position of Dimension but not edit this property.

using(Transaction trans = new Transaction(doc, "ModifyDim"))
{
   trans.Start();
   foreach (Dimension dim in coll)
   {
      int count = dim.Segments.Size;
      if(count > 0)
      {
         for (int i = 0; i < count; i++)
         {
             if (dim.Segments.get_Item(i).ValueString == "5880")
             {
                // trying to change the witness line control property
                ElementType dimType = doc.GetElement(dim.GetTypeId()) as ElementType;
                Parameter attribute = dimType.get_Parameter(BuiltInParameter.DIM_WITNS_LINE_CNTRL);
                bool value = attribute.HasValue;
                attribute.SetValueString("Gap to Element");
                attribute.Set("Gap to Element");
                
                // Moving dim to new position
                XYZ point = new XYZ(0, 50, 0);
                dim.Location.Move(point);
              }
           }
      }
      else
      {
          if(dim.ValueString == "1740")
          {
              XYZ point = new XYZ(80, 0, 0);
              dim.Location.Move(point);
           }
       } 
    }
    trans.Commit();
}

Looking forward to any help or tips on how can I achieve this.

Thanks 

Suraj

[strsuraj · Accepted solution]

Ohh my bad, I was messing it up.

BuiltInParameter.DIM_WITNS_LINE_CNTRL 

 This has storage type - Integer and I was passing string value.

Solution is :

// Change the witness line control property
ElementType dimType = doc.GetElement(dim.GetTypeId()) as ElementType;
Parameter attribute = dimType.get_Parameter(BuiltInParameter.DIM_WITNS_LINE_CNTRL);
attribute.Set(0); // 0 being the index for "Gap to Element"

Thanks.

Suraj