using System;

using System.Collections.Generic;

using System.Linq;

public class Program

{

    public static void Main()

    {

        var list = new List<TestObject>().AsQueryable();

​

        var _record = new Record(5);

        var _recordStruct = new RecordStruct(5);

        var _recordWithoutOperator = new RecordWithoutOperator(5);

        var _struct = new Struct(5);

        var _class = new Class(5);

​

        var r = list.Where(x => x.Id == _record).Expression.ToString();

        var rs = list.Where(x => x.Id == _recordStruct).Expression.ToString();

        var rwo = list.Where(x => x.Id == _recordWithoutOperator).Expression.ToString();

        var s = list.Where(x => x.Id == _struct).Expression.ToString();

        var c = list.Where(x => x.Id == _class).Expression.ToString();

​

        Console.WriteLine(r);

        Console.WriteLine(rs);

        Console.WriteLine(rwo);

        Console.WriteLine(s);

        Console.WriteLine(c);

    }

}

​

public class TestObject

{

    public int Id { get; set; }

​

    public string Name { get; set; }

}

​

public record Record(int Id)

{

    public static implicit operator int(Record hashId) => hashId.Id;

​

    public static implicit operator Record(int id) => new Record(id);

}

​

public record RecordWithoutOperator(int Id)

{

    public static implicit operator int(RecordWithoutOperator hashId) => hashId.Id;

​

    // public static implicit operator Record(int id) => new Record(id);

}

​

public record struct RecordStruct(int Id)

{

    public static implicit operator int(RecordStruct hashId) => hashId.Id;

​

    public static implicit operator RecordStruct(int id) => new RecordStruct(id);

}

​

public struct Struct

{

    public int Id { get; set; }

​

    public Struct(int Id)

    {

        this.Id = Id;

    }

​

    public static implicit operator int(Struct hashId) => hashId.Id;

​

    public static implicit operator Struct(int id) => new Struct(id);

}

​

public class Class

{

    public int Id { get; set; }

​

    public Class(int Id)

    {

        this.Id = Id;

    }

​

    public static implicit operator int(Class hashId) => hashId.Id;

​

    public static implicit operator Class(int id) => new Class(id);

}