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    <p>There are lots of problems with your code. Here's a literal translation:</p> <pre><code>let doParallelForeach() = let input:int[] = [|4; 1; 6; 2; 9; 5; 10; 3|] let sum = ref 0 Parallel.ForEach ( input, (fun ()-&gt; 0), (fun n loopState localSum-&gt; let localSum = localSum + n Console.WriteLine("Thread={0}, n={1}, localSum={2}", Thread.CurrentThread.ManagedThreadId, n, localSum) localSum), (fun (localSum) -&gt; Interlocked.Add(sum, localSum) |&gt; ignore)) </code></pre> <p>Notes:</p> <ol> <li>Since your C# code uses a method, I've made <code>doParallelForeach</code> into a function instead of a value of type <code>unit</code>.</li> <li><code>return</code> and <code>+=</code> aren't valid F# code. You don't need to use <code>return</code> in F#, and you can only modify mutable values (and even then, there are no compound assignment operators). Instead, we just shadow <code>localSum</code> with a new value.</li> <li>You're using <code>ref</code> incorrectly - it is a function in F#, not a modifier, and it is used to define new reference values, not to extract addresses to pass to methods. Furthermore, since <code>sum</code> was a let-bound immutable value, you couldn't take its address anyway. The correct way to do this is to use F#'s <code>ref</code> function to make <code>sum</code> an instance of the <code>int ref</code> type.</li> <li>In F#, you use curried (as opposed to tupled) function definitions when defining a delegate. That is, you use <code>fun n loopState localSum -&gt; ...</code> instead of <code>fun (n, loopState, localSum) -&gt; ...</code>.</li> </ol> <p>Note that regardless of these fixes, this is a weird method - the results are kept in a local variable (<code>sum</code>) which isn't ever exposed to the caller...</p>
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    1. POHow to convert a Parallel.Foreach in C# to F#?
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    1. POHow to convert a Parallel.Foreach in C# to F#?
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    1. COThanks for your help. This does clear up some things. As you can see, I am still learning the ropes. Yes. It is weird method. I removed much of the necessary code.
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