如何使用委托构造一个TransformManyBlock [英] How to construct a TransformManyBlock with a delegate

问题描述

我是C#TPL和DataFlow的新手，我正在努力研究如何实现TPL DataFlow TransformManyBlock .我正在将其他一些代码转换为DataFlow.我的(简化的)原始代码是这样的:

I'm new to C# TPL and DataFlow and I'm struggling to work out how to implement the TPL DataFlow TransformManyBlock. I'm translating some other code into DataFlow. My (simplified) original code was something like this:

private IEnumerable<byte[]> ExtractFromByteStream(Byte[] byteStream)
{
    yield return byteStream; // Plus operations on the array
}

在另一种方法中，我会这样称呼它:

And in another method I would call it like this:

foreach (byte[] myByteArray in ExtractFromByteStream(byteStream))
{
    // Do stuff with myByteArray
}

我正在尝试创建一个 TransformManyBlock 来生成多个较小的数组(实际上是数据包)，这些数组来自较大的输入数组(实际上是一个二进制流)，因此in和out都是类型 byte [] .

I'm trying to create a TransformManyBlock to produce multiple little arrays (actually data packets) that come from the larger input array (actually a binary stream), so both in and out are of type byte[].

我尝试了下面的内容，但我知道我记错了.我想使用与以前相同的功能构造此块，并在其周围包裹 TransformManyBlock .我收到一个错误消息通话不明确..."

I tried what I've put below but I know I've got it wrong. I want to construct this block using the same function as before and to just wrap the TransformManyBlock around it. I got an error "The call is ambiguous..."

var streamTransformManyBlock = new TransformManyBlock<byte[], byte[]>(ExtractFromByteStream);

推荐答案

编译器在推断类型时遇到麻烦.您需要明确指定委托类型以消除呼叫的歧义:

The compiler has troubles with inferring the types. You need to either specify the delegate type explicitly to disambiguate the call:

var block = new TransformManyBlock<byte[], byte[]>(
    (Func<byte[], IEnumerable<byte[]>>) ExtractFromByteStream);

或者您可以使用调用该方法的lambda表达式:

Or you can use a lambda expression that calls into that method:

var block = new TransformManyBlock<byte[], byte[]>(
    bytes => ExtractFromByteStream(bytes));

这篇关于如何使用委托构造一个TransformManyBlock的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！