Adds a new connected asset attached to this asset property, if it allows it. 
   Namespace:   Autodesk.Revit.DB.Visual  
  Assembly:   RevitAPI  (in RevitAPI.dll) Version: 22.0.0.0 (22.1.0.0) 
  Since:  2018.1 
Syntax
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Parameters
- schema
 -  Type:  System String  
The schema name. 
Remarks
 Cannot add a connected asset if one is already connected. Use RemoveConnectedAsset() to avoid an exception being thrown. A new preset asset is created and connected to the property. For "UnifiedBitmap", it contains an empty property unifiedbitmap_Bitmap. 
 Exceptions
| Exception | Condition | 
|---|---|
| Autodesk.Revit.Exceptions ArgumentException | The schema name is not valid. | 
| Autodesk.Revit.Exceptions ArgumentNullException | A non-optional argument was null | 
| Autodesk.Revit.Exceptions InvalidOperationException | The asset property is not editable. -or- Cannot check validity for a property not being edited in AppearanceAssetEditScope. -or- Asset property is already connected to one asset. |