<ExtensionAttribute()>
Public Shared Function Dot(Of T As MemberSelector)( _
   ByVal memberSelector As T, _
   ByVal propertyPath As String _
) As T

Dim memberSelector As T
Dim propertyPath As String
Dim value As T
 
value = MemberSelectorExtensions.Dot(Of T)(memberSelector, propertyPath)

[ExtensionAttribute()]
public static T Dot<T>( 
   T memberSelector,
   string propertyPath
)
where T: MemberSelector

[ExtensionAttribute()]
public:
static T^ Dotgeneric<typename T>
( 
   T^ memberSelector,
   String^ propertyPath
) 
where T: MemberSelector

public void DynamicGroupAndSum() {
  var query = EntityQuery.Create(typeof(Order), manager)
    .GroupBy(new ProjectionSelector("ShipCity"))
    .Select(
          new ProjectionSelector("Key", "ShipCity").Combine(
          new ProjectionSelector("Select", new ProjectionSelector("Freight")).Dot("Sum()").WithAlias("Sum")
    ));
  var list = query.Execute();
}