using System;

using System.Collections.Generic;

using System.Linq;

using System.Linq.Expressions;

​

public class Program

{

    public static void Main(string[] args)

    {

        var www = "substringof('',bushCode) | fieldName";

        Console.WriteLine(www.Split('|')[1]);

        var students = new List<Student>

        {

            new Student { StudentID = 1, StudentCode = "10", Age = 21 },

            new Student { StudentID = 2, StudentCode = "10", Age = 22 },

            new Student { StudentID = 3, StudentCode = "101", Age = 23 },

            new Student { StudentID = 4, StudentCode = "103", Age = 24 },

            new Student { StudentID = 5, StudentCode = "109", Age = 24 },

        };

        var r = students.Where(Like<Student>("StudentCode", "10").Compile());

        foreach(var e in r)

            Console.WriteLine(e.Age);

        static Expression<Func<TEntity, bool>> Like<TEntity>(string propertyName, string queryText)

        {

            var parameter = Expression.Parameter(typeof (TEntity), "entity");

            var getter = Expression.Property(parameter, propertyName);

            //ToString is not supported in Linq-To-Entities, throw an exception if the property is not a string.

            if (getter.Type != typeof (string))

                throw new ArgumentException("Property must be a string");

            //string.Contains with string parameter.

            var stringContainsMethod = typeof (string).GetMethod("Contains", new[] {typeof (string)});

            var containsCall = Expression.Call(getter, stringContainsMethod,

                Expression.Constant(queryText, typeof (string)));

            return Expression.Lambda<Func<TEntity, bool>>(containsCall, parameter);

        }

    }

}

​

public class Student {

    public int StudentID { get; set; }

    public string StudentCode { get; set; }

    public int Age { get; set; }

}