是否存在不接受输入但返回输出的TPL数据流块? [英] Is there a TPL dataflow block that doesn't take input but returns output?
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问题描述
我的问题的标题说明了一切.
The title of my question says it all.
我正在寻找不需要输入的TPL数据流块.
I am looking for a TPL dataflow block that doesn't need an input.
现在我正在使用转换块,但是它的输入尚未使用.
Right now I am using a transform block but it's input is unused.
推荐答案
我将从BufferBlock<T>
构建这样的块:该方法接受代表该块ITargetBlock<T>
端的委托并返回
I would build a block like this from a BufferBlock<T>
: the method accepts a delegate that presents the ITargetBlock<T>
side of the block and returns the ISourceBlock<T>
side of it. This way, the delegate can send input to the block, but from the outside, it looks like a block that only produces output.
代码:
public static ISourceBlock<T> CreateProducerBlock<T>(
Func<ITargetBlock<T>, Task> producer,
int boundedCapacity = DataflowBlockOptions.Unbounded)
{
var block = new BufferBlock<T>(
new ExecutionDataflowBlockOptions { BoundedCapacity = boundedCapacity });
Task.Run(async () =>
{
try
{
await producer(block);
block.Complete();
}
catch (Exception ex)
{
((IDataflowBlock)block).Fault(ex);
}
});
return block;
}
示例用法:
var producer = CreateProducerBlock<int>(async target =>
{
await target.SendAsync(10);
await target.SendAsync(20);
});
ITargetBlock<int> consumer = …;
producer.LinkTo(consumer);
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