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What happened to the Dataflow LinkTo parameter discardMessages?

In "Introduction to TPL Dataflow" Stephen Toub writes under LinkTo: "... and what the behavior should be if the predicate is not met (e.g. should such a message simply be dropped, should such a message be declined and offered to other targets, etc.)"

In some examples I see a boolean being passed to the LinkTo method after the filter predicate and a parameter discardMessages is mentioned. For instance the links in this nice example Tpl Dataflow walkthrough do not compile:

linkBroadcaster.LinkTo(downloader, linkFilter, true);

I cannot find that parameter in the LinkTo overloads. Has this behavior changed to some default?

Solution

  • The discardMessages parameter has been replaced by 

    ...LinkTo(DataflowBlock.NullTarget)

    For a more detailed discussion see Dataflow MSDN forum