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linq how to debug selecting objects into new objects

Posted on 2013-05-25
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Last Modified: 2013-05-29
Hi,
I have a ton of xml web service responses which were converted into classes.  There are a few issues with these as we are seeing.  I commonly do something like the following to display some classes in a grid.  Sometimes depending on the input, everything blows up "Object reference not set to an instance of an object.".  When this happens, how can i go about trying to debug this?  I am guessing there is a null value or something.  I am looking for something reusable.

Thanks!


                var results = (from os in orderStatus.orderstatus
                               select new
                               {
                                   orderNumber = os.orderNumber,
                                   reportedTime = os.reportedTime,
                                   orderstring = os.orderstring,
                                   symbol = os.order.symbol,
                                   quantity = os.order.quantity,
                               }).ToList();
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Question by:jackjohnson44
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3 Comments
 
LVL 42

Expert Comment

by:sedgwick
ID: 39197344
change it to this:
   var results = (from os in orderStatus.orderstatus
                               select new
                               {
                                   orderNumber = os.orderNumber,
                                   reportedTime = os.reportedTime,
                                   orderstring = os.orderstring,
                                   symbol = os.order ! =null ? os.order.symbol : null,
                                   quantity = os.quantity != null ? os.order.quantity : null,
                               }).ToList();

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Author Comment

by:jackjohnson44
ID: 39198012
Thanks, I am more looking for a way to determine which element is having the issue.  i have several of these and want to know what the issue is instead of just checking for null on each element.
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LVL 42

Accepted Solution

by:
sedgwick earned 2000 total points
ID: 39198173
So dont linq but simple foreach.
Add exception handling inside the loop and log iteration that threw exception.
For each(var os in orderStatus.orderstatus){
Try{

}catch(Exception ex){
//log exception and os details her
}
}
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