using System;

using System.Linq.Expressions;

​

public class Program

{

    public static void Main()

    {

        ParameterExpression pe = Expression.Parameter(typeof(Student), "s");

​

        MemberExpression me = Expression.Property(pe, "Age");

        ConstantExpression constant = Expression.Constant(18, typeof(int));

        BinaryExpression body = Expression.GreaterThanOrEqual(me, constant);

        var ExpressionTree = Expression.Lambda<Func<Student, bool>>(body, new[] { pe });

        Console.WriteLine("Expression Tree: {0}", ExpressionTree);

        Console.WriteLine("Expression Tree Body: {0}", ExpressionTree.Body);

        Console.WriteLine("Number of Parameters in Expression Tree: {0}", ExpressionTree.Parameters.Count);

        Console.WriteLine("Parameters in Expression Tree: {0}", ExpressionTree.Parameters[0]);

    }

}

​

public class Student{

​

    public int StudentID { get; set; }

    public string StudentName { get; set; }

    public int Age { get; set; }

}