ArcGIS Pro 3.4 API Reference Guide
ArcGIS.Desktop.Mapping Namespace / BasicFeatureLayer Class / SetEditable Method
A boolean to toggle editability.
Example Version

SetEditable Method (BasicFeatureLayer)
Enables or disables editing on a basic feature layer. This method must be called on the MCT. Use QueuedTask.Run.
Syntax
public void SetEditable( 
   bool isEditable
)

Parameters

isEditable
A boolean to toggle editability.
Exceptions
ExceptionDescription
This method or property must be called within the lambda passed to QueuedTask.Run.
Remarks
Just setting it true will not make a basic feature layer editable unless you have permission to edit on data source level.
Example
Change layer visibility, editability, snappability
if (!layer.IsVisible)
  layer.SetVisibility(true);

if (layer is FeatureLayer featureLayer)
{
  if (!featureLayer.IsEditable)
    featureLayer.SetEditable(true);

  if (!featureLayer.IsSnappable)
    featureLayer.SetSnappable(true);
}
Requirements

Target Platforms: Windows 11, Windows 10

ArcGIS Pro version: 3 or higher.
See Also