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Operator '&&' cannot be applied to operands of type 'System.Guid' and 'int?

I am trying to build a LINQ query using a GUID in a where clause and keep getting this error message. Why can you not search using a GUID as a key?

Here is my code.

var patientlookup = from MPIREC in db.MPIs
                                                    where recordMPI.MPI1 = initGuid &&------squiggle under initGuid
                                                    recordMPI.NPI = ecDoctor.NPI
                                                    select new { MPIREC };

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naspinski

I am assuming that recordMPI.MPI1 is an int, and initGuid is a GUID. They are not the same kind of variable, so you cannot compare them. You will have to convert one to the other before you compare.

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naspinski

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kwh3856

ASKER

naspinski,
That is what I first thought when I read the error message but I checked by table and MPI has a field type of uniquie. When I hover over .MPI1 it displays the message GuidMPI.MPI1. Based on that I assume it is a GUID type.
When I created the initGuid, this is the code I used which initializes the variable as Guid. I know I am missing something here but it is just not jumping out at me. Here the code I use to create initGuid.
Could there be something else?

public static Guid initGuid
{
get
{
return Guid.NewGuid();
}
}

kwh3856

ASKER

ooh...i will try that

kwh3856

ASKER

ok. When I did that, now I get
'&&' cannot be applied to operands of type 'bool' and 'int?'
I thought when I got that error message I am supposed to used the single =
should i use .equals???

kwh3856

ASKER

You were right. I just did not see it. Here was the correct code.

var patientlookup = from MPIREC in db.MPIs
where recordMPI.MPI1 == initGuid &&
recordMPI.NPI == Convert.ToInt32(ecDoctor.NPI)
select new { MPIREC };

Thanks once again.

Operator '&amp;&amp;' cannot be applied to operands of type 'System.Guid' and 'int?

Operator '&&' cannot be applied to operands of type 'System.Guid' and 'int?