循环异步调用WCF服务 [英] Calling WCF service asyncronously in a loop

问题描述

在我的WPF客户端中，我有一个循环，该循环调用WCF服务以更新一些记录.循环完成后，我会显示一条消息，更新完成".

In my WPF client, I have a loop that calls a WCF service to update some records. When the loop is done, I display a message, "Update complete".

我现在将WCF呼叫更改为异步呼叫.

I'm changing my WCF calls to async calls now.

    ServiceClient client = new ServiceClient();
    client.UpdateRecordsCompleted +=new System.EventHandler<System.ComponentModel.AsyncCompletedEventArgs>(client_UpdateRecordsCompleted);

    foreach (MyItem item in someCollection)
    {
         client.UpdateRecordsAsync(item);
    } 

    MessageBox.Show("Update complete");

在每次操作的比赛中我都不需要做任何事情.我只需要在最后一个 末尾显示一条消息即可.

I don't need to do anything in the competed event of each operation. I need to just display a message at the end of the last one.

有什么想法吗?

我可能会将其移植到Silverlight，所以这就是为什么我需要异步调用该服务的原因.我认为我不能使用后台工作者.

I may be porting this to Silverlight, so that's why I need to call the service asyncronously. I don't think I can use the background worker.

推荐答案

我将在WPF窗口中添加一个线程安全字段，以跟踪用户排队的客户端更新数量:

I would add a thread-safe field to your WPF window to track the number of client updates the user has queued:

private int recordsQueued = 0;

在分派单个异步操作之前，请将recordsQueueed设置为someCollection.Count.

Before dispatching the individual async operations, set recordsQueued to someCollection.Count.

recordsQueued = someCollection.Count;

最后，在client_UpdateRecordsCompleted中，递减记录已排队；如果为零，则显示更新完成"消息:

Finally, in client_UpdateRecordsCompleted, decrement recordsQueued; if it is zero, display the "Update Complete" message:

private void client_UpdateRecordsCompleted(AsyncCompletedEventArgs args) {
  if (Interlocked.Decrement(ref recordsQueued) == 0)
    MessageBox.Show("Update complete.");      
}

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