public bool IsNullable {get;}

// Loads the schema of the specified feature layer and iterates through its attributes,  providing access to their properties such as field name, alias, type, and other metadata.
await QueuedTask.Run(() =>
{
  // create an instance of the inspector class
  var inspector = new Inspector();
  // load the layer
  inspector.LoadSchema(featureLayer);
  // iterate through the attributes, looking at properties
  foreach (var attribute in inspector)
  {
    var fldName = attribute.FieldName;
    var fldAlias = attribute.FieldAlias;
    var fldType = attribute.FieldType;
    int idxFld = attribute.FieldIndex;
    var fld = attribute.GetField();
    var isNullable = attribute.IsNullable;
    var isEditable = attribute.IsEditable;
    var isVisible = attribute.IsVisible;
    var isSystemField = attribute.IsSystemField;
    var isGeometryField = attribute.IsGeometryField;
  }
});