[英]How to know in codebehind when XmlDataProvider has filled target controll with data
[英]In a JoinBlock, receive a Target when the other Target is filled
我将 JoinBlock 连接到 WriteOnceBlock 和 BufferBlock 以填充目标 1 和 2。我的目标是每次 JoinBlock 收到来自 BufferBlock 的消息时,它还请求 WriteOnceBlock 持有的值。
我的第一个猜测是我可以将 ContinueWith 委托添加到 Target2 Completion 事件,但这不太正确 - 我需要附加到似乎不存在的 Filled 事件之类的东西。
我还尝试在非贪婪模式下使用 join 块作为最后的努力,但这并没有改变输出。
我在这里遗漏了一些明显的东西吗?
例子:
static void Main(string[] args)
{
var writeOnceBlockTest = new WriteOnceBlock<int>(i => i);
var queueBlockTest = new BufferBlock<string>();
var joinBlockTest = new JoinBlock<int, string>();
var actionBlockTest = new ActionBlock<System.Tuple<int, string>>(tuple => Console.WriteLine($"I received int {tuple.Item1} and string {tuple.Item2}."));
writeOnceBlockTest.LinkTo(joinBlockTest.Target1);
queueBlockTest.LinkTo(joinBlockTest.Target2, new DataflowLinkOptions{PropagateCompletion = true});
joinBlockTest.LinkTo(actionBlockTest, new DataflowLinkOptions { PropagateCompletion = true });
writeOnceBlockTest.Post(3);
queueBlockTest.Post("String1");
queueBlockTest.Post("String2");
writeOnceBlockTest.Post(4);
writeOnceBlockTest.Post(5);
queueBlockTest.Post("String3");
queueBlockTest.Post("String4");
queueBlockTest.Complete();
Console.ReadLine();
}
期望的输出:
我收到了 int 3 和字符串 String1。
我收到了 int 3 和字符串 String2。
我收到了 int 3 和字符串 String3。
我收到了 int 3 和字符串 String4。
实际输出:
我收到了 int 3 和字符串 String1。
JoinBlock
在这里不是正确的选择,尽管它看起来很合适。 正如您所发现的, WriteOnceBlock
只提供一次它的价值。 但是,您可以多次读取该值。 有了这个,您可以使用TransformBlock
来获得您想要的行为。
public class JoinFlow
{
[Test]
public async Task TestWriteOnceBlock()
{
var writeOnceBlockTest = new WriteOnceBlock<int>(i => i);
var queueBlockTest = new BufferBlock<string>();
var transformBlockTest = new TransformBlock<string, Tuple<int, string>>(async str => Tuple.Create(await writeOnceBlockTest.ReceiveAsync(), str));
var actionBlockTest = new ActionBlock<Tuple<int, string>>(tuple => Console.WriteLine($"I received int {tuple.Item1} and string {tuple.Item2}."));
queueBlockTest.LinkTo(transformBlockTest, new DataflowLinkOptions { PropagateCompletion = true });
transformBlockTest.LinkTo(actionBlockTest, new DataflowLinkOptions { PropagateCompletion = true });
writeOnceBlockTest.Post(3);
queueBlockTest.Post("String1");
queueBlockTest.Post("String2");
writeOnceBlockTest.Post(4);
writeOnceBlockTest.Post(5);
queueBlockTest.Post("String3");
queueBlockTest.Post("String4");
queueBlockTest.Complete();
await actionBlockTest.Completion;
}
}
输出:
I received int 3 and string String1.
I received int 3 and string String2.
I received int 3 and string String3.
I received int 3 and string String4.
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