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

Posted on 2009-02-17
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Last Modified: 2013-12-17
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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Question by:kwh3856
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6 Comments
 
LVL 21

Expert Comment

by:naspinski
ID: 23667041
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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LVL 21

Accepted Solution

by:
naspinski earned 2000 total points
ID: 23667066
scratch my last comment.

Once again, you are using '=' instead of '=='

You are trying to set the variables, not compare them
0
 

Author Comment

by:kwh3856
ID: 23667071
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();
}
}
0
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Author Comment

by:kwh3856
ID: 23667075
ooh...i will try that
0
 

Author Comment

by:kwh3856
ID: 23667084
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???
 
0
 

Author Closing Comment

by:kwh3856
ID: 31548151
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.
0

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