Linq之动态排序（字符传入）

static class Program  
{                                                                                                                                                                                       
    static void Main(string[] args)                                                          
                                                                                             
    {                                                                                        
                                                                                             
        string[] array = { "aaa", "bb", "c" };                                               
                                                                                             
        foreach (var item in array.AsQueryable().OrderBy("Length"))                          
                                                                                             
        {                                                                                    
                                                                                             
            Console.WriteLine(item);                                                         
                                                                                             
        }                                                                                    
                                                                                             
        Console.ReadLine();                                                                  
                                                                                             
    }                                                                                        
                                                                                             
                                                                                             
                                                                                             
    public static IQueryable<T> OrderBy<T>(this IQueryable<T> query, string prop)            
                                                                                             
    {                                                                                        
                                                                                             
        var member = typeof(T).GetProperty(prop);                                            
                                                                                             
        return (IQueryable<T>)typeof(Program)                                                
                                                                                             
            .GetMethod("OrderByCore", BindingFlags.Static | BindingFlags.NonPublic)          
                                                                                             
            .MakeGenericMethod(typeof(T), member.PropertyType)                               
                                                                                             
            .Invoke(null, new object[] { query, member });                                   
                                                                                             
    }                                                                                        
                                                                                             
                                                                                             
                                                                                             
    private static IQueryable<T> OrderByCore<T, TMember>(IQueryable<T> query, MemberInfo memb
                                                                                             
    {                                                                                        
                                                                                             
        ParameterExpression item;                                                            
                                                                                             
        return query.OrderBy<T, TMember>(Expression.Lambda<Func<T, TMember>>(                
                                                                                             
            Expression.MakeMemberAccess(item = Expression.Parameter(typeof(T), "item"), membe
                                                                                             
    }                                                                                        
                                                                                             
}                                                                                            

http://weblogs.asp.net/scottgu/archive/2008/01/07/dynamic-linq-part-1-using-the-linq-dynamic-query-library.aspx