5
我已经将一个简单的应用程序放在一起,该应用程序监视文件创建事件,从文件内容创建一些对象并进行一些处理。下面是示例代码:使PLINQ和BlockingCollection一起工作
class Program
{
private const string Folder = "C:\\Temp\\InputData";
static void Main(string[] args)
{
var cts = new CancellationTokenSource();
foreach (var obj in Input(cts.Token))
Console.WriteLine(obj);
}
public static IEnumerable<object> Input(CancellationToken cancellationToken)
{
var fileList = new BlockingCollection<string>();
var watcher = new FileSystemWatcher(Folder);
watcher.Created += (source, e) =>
{
if (cancellationToken.IsCancellationRequested)
watcher.EnableRaisingEvents = false;
else if (Path.GetFileName(e.FullPath) == "STOP")
{
watcher.EnableRaisingEvents = false;
fileList.CompleteAdding();
File.Delete(e.FullPath);
}
else
fileList.Add(e.FullPath);
};
watcher.EnableRaisingEvents = true;
return from file in
fileList.GetConsumingEnumerable(cancellationToken)
//.AsParallel()
//.WithCancellation(cancellationToken)
//.WithDegreeOfParallelism(5)
let obj = CreateMyObject(file)
select obj;
}
private static object CreateMyObject(string file)
{
return file;
}
}
这一切工作正常,但是当我取消进行AsParallel(和接下来的两行),它不产生结果的时候了。这种延迟可能是由PLINQ分区造成的?但是,我期望这个查询在它们被添加到BlockingCollection时立即生成项目。这可能实现使用PLINQ?
这工作得很好。非常感谢! – yuramag