using System;

using System.Collections.Generic;

using System.Linq;

using System.Linq.Expressions;

​

public class mini

{

    public long SN;

    public int PlayTime;

    public string Date;

    public int Score;

}

public class Program

{

    public static void Main()

    {

        string sortColumn = "Date";

        string sortColumnDir = "ASC";

​

        List<mini> result = new List<mini>

        {

            new mini

            {

                SN = 2,

                Date = "A",

            },

            new mini

            {

                SN = 3,

                Date = "C",

            },

            new mini

            {

                SN = 1,

                Date = "B",

            }

        };

        var parameter = Expression.Parameter(typeof(mini), "c");

        var member = Expression.PropertyOrField(parameter, sortColumn);

        var cast = Expression.Convert(member, typeof(IComparable));

        var lambda = Expression.Lambda<Func<mini, IComparable>>(cast, parameter);

        var func = lambda.Compile();

​

        var sortedResult = sortColumnDir == "ASC"

            ? result.OrderBy(func)

            : result.OrderByDescending(func);

​

        foreach (var mini in sortedResult)

        {

            Console.WriteLine("{0}, {1}", mini.SN, mini.Date);

        }       

    }

}