Returns the list start number of the paragraphs in a given text range. 
   Namespace:   Autodesk.Revit.DB  
  Assembly:   RevitAPI  (in RevitAPI.dll) Version: 17.0.0.0 (17.0.1090.0) 
  Since:  2017 
Syntax
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Parameters
- textRange
 -  Type:  Autodesk.Revit.DB TextRange  
The given text range. 
Return Value
The list start number of the text range.Remarks
 Returns -1 if there is a mix of list start values in the range or if there are paragraphs in different lists or sub-lists in the range or if there are paragraphs of type  None  or  Bullet  in the range. 
 Exceptions
| Exception | Condition | 
|---|---|
| Autodesk.Revit.Exceptions ArgumentException | This start index of this text range is not within the text range identifying the entire text. -or- The end of this text range is not within the text range identifying the entire text. | 
| Autodesk.Revit.Exceptions ArgumentNullException | A non-optional argument was NULL |