Calculating statistics for a range of dates

…So far I've described how I configured my web service, and how I wrote the code…to get the data and then format it as JSON to send back to the requester.…Now I'll describe how I'm handling the aggregation of…values for more than one date at a time.…And for this, I'll go to the GetData method of the feed manager class.…Just as with the Console application, I have these…three constants, Wind Speed, Barometric Pressure and Air Temperature.…And each time the GetData method is called, I'm using the start date, the…end date, and the data type to go get the data from the cache.…

Now this is a different condition than the console application.…Remember in my introduction I said I didn't want to do all…these operations synchronously in the web service, so in this code I've established…a rule that says if any particular combination of date and data…type isn't represented in my local data cache, I won't try to respond.…Instead, I'll just throw an exception.…And because the code that you see starting at line…33 isn't wrapped in a try catch block, the exception…