ActionBlock<TInput>.Complete Method

.NET Framework (current version)

Signals to the dataflow block that it shouldn't accept or produce any more messages and shouldn't consume any more postponed messages.

Namespace:  System.Threading.Tasks.Dataflow
Assembly:  System.Threading.Tasks.Dataflow (in System.Threading.Tasks.Dataflow.dll)

public void Complete()



After Complete has been called on a dataflow block, that block will complete (so that its Completion task will enter a final state) after it has processed all previously available data. This method will not block waiting for completion to occur, but will initiate the request. To wait for completion to occur, use the Completion property.

The following example shows the use of the Complete method to signal to the dataflow block that it shouldn't accept or produce any more messages nor consume any more postponed messages. This code example is part of a larger example provided for the How to: Specify the Degree of Parallelism in a Dataflow Block topic.

// Performs several computations by using dataflow and returns the elapsed 
// time required to perform the computations. 
static TimeSpan TimeDataflowComputations(int maxDegreeOfParallelism,
   int messageCount)
   // Create an ActionBlock<int> that performs some work. 
   var workerBlock = new ActionBlock<int>(
      // Simulate work by suspending the current thread.
      millisecondsTimeout => Thread.Sleep(millisecondsTimeout),
      // Specify a maximum degree of parallelism. 
      new ExecutionDataflowBlockOptions
         MaxDegreeOfParallelism = maxDegreeOfParallelism

   // Compute the time that it takes for several messages to  
   // flow through the dataflow block.

   Stopwatch stopwatch = new Stopwatch();

   for (int i = 0; i < messageCount; i++)

   // Wait for all messages to propagate through the network.

   // Stop the timer and return the elapsed number of milliseconds.
   return stopwatch.Elapsed;

.NET Framework

Supported in: 4.5

Portable Class Library

Supported in: Portable Class Library