How to implement the function of Java‘s ’ExcutorCompletionService‘ class in C#.net？How to the simple Java codes below to Equivalent C#.net codes？

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In C#.NET, is there an implemention like Java's CompletionService?

I just need to convert the simple Java codes below to Equivalent C#.net codes.

ExecutorService pool = null;
pool = Executors.newFixedThreadPool(BaseBlockUtil.THREAD_NUN);
CompletionService<BlockObject> completionService = new ExecutorCompletionService<BlockObject>(pool);        
int runnerThread = 0;
foreach (BlockObject blockObject in putExtra.processes)
{
    runnerThread++;
    while (runnerThread > (BaseBlockUtil.THREAD_NUN + 1))
    {
        completionService.take().get();
        runnerThread--;
    }
    BlockUpload task = new BlockUpload(blockObject, jsonObjectRet, putExtra, token, httpClient, uploadBatch);
    completionService.submit(task);
}

for (int i = 0; i < runnerThread; i++)
{
    completionService.take().get();
}
pool.shutdown();

For 'ExcutorService', I can think of using C#'s 'ThreadPool' to replace it. But for 'ExcutorCompletionService' , I have searched for one day on google and have got nothing.