[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
我將 JoinBlock 連接到 WriteOnceBlock 和 BufferBlock 以填充目標 1 和 2。我的目標是每次 JoinBlock 收到來自 BufferBlock 的消息時,它還請求 WriteOnceBlock 持有的值。
我的第一個猜測是我可以將 ContinueWith 委托添加到 Target2 Completion 事件,但這不太正確 - 我需要附加到似乎不存在的 Filled 事件之類的東西。
我還嘗試在非貪婪模式下使用 join 塊作為最后的努力,但這並沒有改變輸出。
我在這里遺漏了一些明顯的東西嗎?
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($"I received int {tuple.Item1} and string {tuple.Item2}."));
writeOnceBlockTest.LinkTo(joinBlockTest.Target1);
queueBlockTest.LinkTo(joinBlockTest.Target2, new DataflowLinkOptions{PropagateCompletion = true});
joinBlockTest.LinkTo(actionBlockTest, new DataflowLinkOptions { PropagateCompletion = true });
writeOnceBlockTest.Post(3);
queueBlockTest.Post("String1");
queueBlockTest.Post("String2");
writeOnceBlockTest.Post(4);
writeOnceBlockTest.Post(5);
queueBlockTest.Post("String3");
queueBlockTest.Post("String4");
queueBlockTest.Complete();
Console.ReadLine();
}
期望的輸出:
我收到了 int 3 和字符串 String1。
我收到了 int 3 和字符串 String2。
我收到了 int 3 和字符串 String3。
我收到了 int 3 和字符串 String4。
實際輸出:
我收到了 int 3 和字符串 String1。
JoinBlock
在這里不是正確的選擇,盡管它看起來很合適。 正如您所發現的, WriteOnceBlock
只提供一次它的價值。 但是,您可以多次讀取該值。 有了這個,您可以使用TransformBlock
來獲得您想要的行為。
public class JoinFlow
{
[Test]
public async Task TestWriteOnceBlock()
{
var writeOnceBlockTest = new WriteOnceBlock<int>(i => i);
var queueBlockTest = new BufferBlock<string>();
var transformBlockTest = new TransformBlock<string, Tuple<int, string>>(async str => Tuple.Create(await writeOnceBlockTest.ReceiveAsync(), str));
var actionBlockTest = new ActionBlock<Tuple<int, string>>(tuple => Console.WriteLine($"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;
}
}
輸出:
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.
聲明:本站的技術帖子網頁,遵循CC BY-SA 4.0協議,如果您需要轉載,請注明本站網址或者原文地址。任何問題請咨詢:yoyou2525@163.com.