parallel.foreach

I'm calling a slow webservice in parallel. Things were great until I realized I need to get some information back from the service. But I don't see where to get the values back. I can't write to the database, HttpContext.Current appears to be null inside of a method called using Parallel.ForEach Below is a sample program (in your mind, please imagine a slow web service instead of a string concatenation) using System; using System.Threading.Tasks; class Program { static void Main(string[] args) { WordMaker m = new WordMaker(); m.MakeIt(); } public class WordMaker { public void MakeIt() { string

I need to speed up performing 12 queries in my application. I switched from a regular foreach to Parallel.ForEach. But sometimes I get an error saying "ExecuteReader requires an open and available connection The connection's current state is connecting." It is my understanding that since many of the 12 queries are using the same InitialCatalog, there is not really a new connection for of the 12 and that may be the problem? How can i fix this? "sql" is a list of type "Sql"- a class is just a string name, string connectiona and a List of queries. Here is the code: /// <summary> /// Connects to

I want to process something using parallel loop like this : public void FillLogs(IEnumerable<IComputer> computers) { Parallel.ForEach(computers, cpt=> { cpt.Logs = cpt.GetRawLogs().ToList(); }); } Ok, it works fine. But How to do if I want the FillLogs method return an IEnumerable ? public IEnumerable<IComputer> FillLogs(IEnumerable<IComputer> computers) { Parallel.ForEach(computers, cpt=> { cpt.Logs = cpt.GetRawLogs().ToList(); yield return cpt // KO, don't work }); } EDIT It seems not to be possible... but I use something like this : public IEnumerable<IComputer> FillLogs(IEnumerable

In my application I want my main thread to be not used by anything else. I have to do some parallel processing that I would like to be done by different threads. For that I am using Parallel.For as follows static void SomeMethod() { Console.WriteLine(string.Format("Main Thread ID before parallel loop ->>>>>>> {0} ", System.Threading.Thread.CurrentThread.ManagedThreadId)); Parallel.For(0, 10, i => { Console.WriteLine(string.Format("Output ->>>>>>> {0} ", System.Threading.Thread.CurrentThread.ManagedThreadId)); }); Thread.Sleep(100); Console.WriteLine(string.Format("Main Thread ID after parallel

Erg, I'm trying to find these two methods in the BCL using Reflector, but can't locate them. What's the difference between these two snippets? A: IEnumerable<string> items = ... Parallel.ForEach(items, item => { ... }); B: IEnumerable<string> items = ... foreach (var item in items.AsParallel()) { ... } Are there different consequences of using one over the other? (Assume that whatever I'm doing in the bracketed bodies of both examples is thread safe.) They do something quite different. The first one takes the anonymous delegate, and runs multiple threads on this code in parallel for all the

I want to know, how many threads will be used when I run Parallel.For/ForEach loop. I found, that it can be changed by MaxDegreeOfParallelism option. MaxDegreeOfParallelism help on MSDN says ( link ): By default, For and ForEach will utilize however many threads the underlying scheduler provides, so changing MaxDegreeOfParallelism from the default only limits how many concurrent tasks will be used. But I don't know how many threads underlying scheduler provides. How can I find out that? I could test it with loop with 9999999 runs, however this test will show me number, but not the rule that