using System;

using System.Linq;

using System.Collections.Generic;

using System.Linq.Expressions;

public class Program

{

    public class Item

    {

        public string Name {get; set;}

    }

    public static void Main()

    {

        var itemType = typeof(Item);

        var propName = nameof(Item.Name);

        var items = new List<Item>{ new Item{Name="Name1"}, new Item{Name="Name2"} };

        var paramExpr = Expression.Parameter(itemType);

        var propCoalesceExpr = Expression.Coalesce(Expression.Property(paramExpr, propName), Expression.Property(paramExpr, propName));

        var propAccessExpr = Expression.Lambda(propCoalesceExpr, paramExpr);

        //var propAccessExpr = Expression.Lambda(Expression.Property(paramExpr, propName), paramExpr);

        var callExpr = Expression.Call(

                        typeof(Enumerable), "OrderBy", new[] { itemType, propAccessExpr.ReturnType }, Expression.Constant(items), propAccessExpr);

        Console.WriteLine(callExpr);

    }

}