using System;

using System.Linq.Expressions;

​

public class Program

{

    public static void Main()

    {

        TestString();

        TestGuid();

    }

    public static void TestString()

    {

        var title = "TestStr";

        var param = Expression.Parameter(typeof(Test), "x");

        var predicate = Expression.Lambda<Func<Test, bool>>(

            Expression.Equal(

                Expression.Property(param, "Name"),

                Expression.Constant(title, typeof(string))

            ),

            param

        );

        // build

        var fn = predicate.Compile();

        var ffn = FastExpressionCompiler.ExpressionCompiler.Compile<Func<Test, bool>>(predicate);

        // test

        var entity = new Test();

        var fnRes = fn(entity);

        var ffnRes = ffn(entity);

        Console.WriteLine("TestString(): OK!");

    }

    public static void TestGuid()

    {

        var id = Guid.NewGuid();

        var param = Expression.Parameter(typeof(Test), "x");

        var predicate = Expression.Lambda<Func<Test, bool>>(

            Expression.Equal(

                Expression.Property(param, "Id"),

                Expression.Constant(id, typeof(Guid))

            ),

            param

        );

        // build

        var fn = predicate.Compile();

        var ffn = FastExpressionCompiler.ExpressionCompiler.Compile<Func<Test, bool>>(predicate);

        // test

        var entity = new Test();

        var fnRes = fn(entity);

        var ffnRes = ffn(entity);

        Console.WriteLine("TestGuid(): OK!");

    }

    public class Test

    {

        public Guid Id { get; set; }

        public string Name { get; set; }

        public Test()

        {

            Id = Guid.NewGuid();    

        }

    }

}

​