Question

I am very confused.

I have this lambda expression:

tvPatientPrecriptionsEntities.Sort((p1, p2) =>
    p1.MedicationStartDate
      .Value
      .CompareTo(p2.MedicationStartDate.Value));

Visual Studio will not compile it and complains about syntax.

I converted the lamba expression to an anonymous delegate as so:

tvPatientPrecriptionsEntities.Sort(
  delegate(PatientPrecriptionsEntity p1, PatientPrecriptionsEntity p2) 
  {
      return p1.MedicationStartDate
               .Value
               .CompareTo(p2.MedicationStartDate.Value);
  });

and it works fine.

The project uses .NET 3.5 and I have a reference to System.Linq.

Answer 1

DateTime.CompareTo is overloaded. Try using explicit parameter types in your lambda:

(DateTime p1, DateTime p2) => ...