Linq query referencing objects and a string array

Question

I am having some trouble in converting the following code to use LINQ.

int occurs = 0;
foreach (string j in items)
{
if (!string.IsNullOrEmpty(j))
            {
                WorkflowModule tempWM = new WorkflowModule(j);
                if (tempWM.StateID == item.StateID)
                {
                    occurs++;
                }
            }
        }
        return occurs;

So far, I have:-

var lstItems = (from lstItem in items
                        where !string.IsNullOrEmpty(lstItem)
                        let objWorkflowModule = new WorkflowModule(lstItem)
                        select new
                        {
                            tempWM = objWorkflowModule.StateID
                        }).Where(item.StateID == tempWM));

        return lstItems.Count();

but intellisense is not liking the line '.Where(item.StateID == tempWM))'

Can anyone help me achieve this?

Thanks.

Kirk Woll · Accepted Answer · 2011-04-06 16:20:45Z

6

When you use the method syntax, you need to use a lambda on the Where operator:

...
}).Where(x => x.tempWM == item.StateID));

In other words, you need to "declare" the variable x which holds the result of the previous part of the query.

edited Apr 6, 2011 at 16:20

answered Apr 6, 2011 at 14:59

Kirk Woll

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1 Comment

juharr Over a year ago

I think they actually want Where(t => t.tempWM == item.StateID) because item seems to be a variable defined outside the original code.

Ryan Bennett · Accepted Answer · 2011-04-06 15:00:04Z

0

It doesn't look like item is initialized anywhere in your statement.

answered Apr 6, 2011 at 15:00

Ryan Bennett

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Comments

juharr · Accepted Answer · 2011-04-06 15:55:04Z

0

Here's how I'd do this

var lstItems = from lstItem in items
               where !string.IsNullOrEmpty(lstItem)
               let objWorkflowModule = new WorkflowModule(lstItem)
               select objWorkflowModule.StateID;

return lstItems.Count(t=> t == item.StateID);

I'm assuming item is a variable defined outside of the original code you submitted. Basically you don't need to create the anonymous class in the query and you can put the predicate in you're Where into Count instead. But as others have said the main issue is that you need to express your predicate as a lambda.

edited Apr 6, 2011 at 15:55

answered Apr 6, 2011 at 15:49

juharr

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