Lambda中的几个语句

Question

I have the following statement

var evarage = productionreportentry
              .Sum(productionReportEntry => productionReportEntry.Cycletime);

I would like to add some logging inside the Sum lambda. Is this possible?

Answer 1

Yep, do something like:

var evarage = productionreportentry.Sum(productionReportEntry => 
{ 
   Trace.Writeline(productionReportEntry.Cycletime);
   return productionReportEntry.Cycletime;
});

Basically you add the curly brackets, and you need to explicitly return the value that the lambda is operating on, in this case the Cycletime which is used as part of the sum.

Answer 2

I am not sure what you really want but you can have multiple statements like this

        var evarage = productionreportentry.Sum(productionReportEntry =>
            {
                CreateLog();
                return productionReportEntry.Cycletime;
            });