I am trying to find object in db using lambda expression depending on its composite key

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C#

ASP

MVC

i am using lambda expression to get object(Appointment) from database using its composite key (clinicId, Time, Date) but i don't know what to write

What I have tried:

i tried to write :

Appointment appointment = db.Appointments.Find(i => new {i.ClinicId, i.Date, i.Time,});

but an error appear:

Cannot convert lambda expression to type 'object[]' because it is not a delegate type

and i tried to write:

Appointment appointment = db.Appointments.Find(v => new MyClass { v.ClinicId, v.Time, v.Date });

where

private class MyClass {
            public TimeSpan Time { get; set; }
            public DateTime Date { get; set; }
            public int ClinicId { get; set; }
        } 

but the same error appear
thanks for your support