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A call to Break( ) requests that the parallel loop stop as soon as possible, which might be a few iterations beyond the one in which Break( ) is called However, all iterations prior to the one in which Break( ) is called will still execute Also, remember that portions of the loop might be running in parallel, so if 10 iterations have taken place, it does not necessarily mean that those 10 iterations represent the first 10 values of the loop control variable Breaking from a parallel For( ) loop is often useful when data is being searched If the desired value is found, there is no need to further execute the loop It might also be used if invalid data is encountered during an operation The following program demonstrates the use of Break( ) with a For( ) loop It reworks the previous example so that MyTransform( ) now has a ParallelLoopState parameter and the Break( ) method is called if a negative value is found in data Inside Main( ), a negative value is put into the data array (which will cause the loop to break) The completion status of the transform loop is checked Since the negative value in data will cause it to terminate early, the IsCompleted property will be false, and the iteration count at which the loop was terminated is displayed (The program removes the redundant loops used by the previous version, keeping only the most efficient of each, which is the sequential initialization loop and the parallel transform loop)

// Use ParallelLoopResult, ParallelLoopState, and Break() // with a parallel For loop using System; using SystemThreadingTasks; class DemoParallelForWithLoopResult { static int[] data; // A method to be run as the body of a parallel loop // The statements in this loop are designed to simply // consume some CPU time for the purposes of demonstration static void MyTransform(int i, ParallelLoopState pls) { // Break out of loop if a negative value is found if(data[i] < 0) plsBreak(); data[i] = data[i] / 10; if(data[i] if(data[i] if(data[i] if(data[i] } static void Main() { ConsoleWriteLine("Main thread starting"); data = new int[100000000]; // Initialize data < > > > 1000) data[i] = 0; 1000 & data[i] < 2000) data[i] = 100; 2000 & data[i] < 3000) data[i] = 200; 3000) data[i] = 300;

For clarity we set ( x) = cos x, ( x) = sin x The integral becomes ( x) dx 1 + 2 ( x)

Part II:

for(int i=0; i < dataLength; i++) data[i] = i; // Put a negative value into data data[1000] = -10; // Parallel transform loop ParallelLoopResult loopResult = ParallelFor(0, dataLength, MyTransform); // See if the loop ran to completion if(!loopResultIsCompleted) ConsoleWriteLine("\nLoop Terminated early because a " + "negative value was encountered\n" + "in iteration number " + loopResultLowestBreakIteration + "\n"); ConsoleWriteLine("Main thread ending"); } }

Sample output is shown here:

By what we have just learned about Tan 1 , this last integral is equal to Tan 1 ( x) + C Resubstituting ( x) = cos x yields that sin x 1 + cos2 x dx = Tan 1 ( cos x) + C

Main thread starting Loop Terminated early because a negative value was encountered in iteration number 1000 Main thread ending

As the output shows, the transform loop stops after 1000 iterations This is because Break( ) is called inside the MyTransform( ) method when a negative value is encountered In addition to the two described here, there are several additional forms of For( ) Some let you specify various options Others use long rather than int as the type of iteration parameters There are also forms of For( ) that provide added flexibility, such as being able to specify a method that is invoked when each loop thread ends One other point: if you want to stop a For( ) loop and don t care if any more iterations whatsoever are performed, use the Stop( ) method, rather than Break( )

You can create a parallelized version of the foreach loop by using the ForEach( ) method It has several forms Here is its simplest form: public static ParallelLoopResult ForEach<TSource>(IEnumerable<TSource> source, Action<TSource> body) Here, source specifies the collection of data over which the loop will iterate and body specifies the method that will be executed with each iteration As explained earlier in this book, all arrays and collections (described in 25), as well as several other sources, support IEnumerable<T> The method that you pass to the body receives the value of or reference to (not the index of) each element being iterated as an argument Information about the status of the loop is returned