Here is something new to play with. I just released a package that adds commands for OrderBy that take strings for property name and direction.
.OrderBy("Property desc").ThenBy("OtherProperty desc");
.OrderBy("Property desc, OtherProperty asc");
.OrderBy("Property, OtherProperty desc");
Since these commands parse the strings and then call the standard IQueryable/IEnumerable commands for OrderBy and ThenBy, these commands will still work with your EntityFramework queries or any other LINQ queries.
Get or review the source at https://github.com/Grax32/OrderByString and install the NuGet package from https://www.nuget.org/packages/OrderByString/