using System;

using System.Linq;

using System.Collections.Generic;

using System.Linq.Expressions;

​

public static class Program

{

    public static void Main()

    {

        var sortOptions = new List<(string propertyName, bool isAscending)>

        {

            ("Name", true), // true for ascending

            ("Age", false)  // false for descending

        };

​

        var items = new List<MyObject> {

            new MyObject { Name = "John", Age = 30 },

            new MyObject { Name = "John", Age = 31 },

            new MyObject { Name = "John", Age = 29 },

            new MyObject { Name = "Jane", Age = 25 },

            // ... other items

        };

​

        var sortedItems = items.AsQueryable().ApplySorting(sortOptions);

​

        foreach (var item in sortedItems)

        {

            Console.WriteLine($"Name: {item.Name}, Age: {item.Age}");

        }

    }

​

    public static IQueryable<T> ApplySorting<T>(this IQueryable<T> source, IEnumerable<(string propertyName, bool isAscending)> sortOptions)

    {

        bool firstSort = true;

​

        foreach (var (propertyName, isAscending) in sortOptions)

        {

            var parameter = Expression.Parameter(typeof(T), "x");

            var property = Expression.PropertyOrField(parameter, propertyName);

            var lambda = Expression.Lambda(property, parameter);

​

            var methodName = firstSort

                ? (isAscending ? "OrderBy" : "OrderByDescending")

                : (isAscending ? "ThenBy" : "ThenByDescending");

​

            var method = typeof(Queryable).GetMethods()

                .First(m => m.Name == methodName && m.GetParameters().Length == 2)

                .MakeGenericMethod(typeof(T), property.Type);

​

            source = (IOrderedQueryable<T>)method.Invoke(null, new object[] { source, lambda });

​

            firstSort = false;

        }

​

        return source;

    }

}

​

public class MyObject

{

    public string Name { get; set; }

    public int Age { get; set; }

}

​