[英]HostingEnvironment.QueueBackgroundWorkItem - Clarification?
[英]Difference between HostingEnvironment.QueueBackgroundWorkItem and HostingEnvironment.RegisterObject
目前我正在使用HostingEnvironment.RegisterObject
在我的MVC 5应用程序中运行我的后台工作。 具体来说,我有,
public class BackgroundWorker
{
/// <summary>
/// Runs a background task that is registered with the hosting environment
/// so it is guaranteed to finish executing.
/// </summary>
/// <param name="action">The lambda expression to invoke.</param>
public static void Run(Action action)
{
new IISBackgroundTask().DoWork(action);
}
/// <summary>
/// Generic object for completing tasks in a background thread
/// when the request doesn't need to wait for the results
/// in the response.
/// </summary>
class IISBackgroundTask : IRegisteredObject
{
/// <summary>
/// Constructs the object and registers itself with the hosting environment.
/// </summary>
public IISBackgroundTask()
{
HostingEnvironment.RegisterObject(this);
}
/// <summary>
/// Called by IIS, once with <paramref name="immediate"/> set to false
/// and then again with <paramref name="immediate"/> set to true.
/// </summary>
void IRegisteredObject.Stop(bool immediate)
{
if (_task.IsCompleted || _task.IsCanceled || _task.IsFaulted || immediate)
{
// Task has completed or was asked to stop immediately,
// so tell the hosting environment that all work is done.
HostingEnvironment.UnregisterObject(this);
}
}
/// <summary>
/// Invokes the <paramref name="action"/> as a Task.
/// Any exceptions are logged
/// </summary>
/// <param name="action">The lambda expression to invoke.</param>
public void DoWork(Action action)
{
try
{
_task = Task.Factory.StartNew(action);
}
catch (AggregateException ex)
{
// Log exceptions
foreach (var innerEx in ex.InnerExceptions)
{
Logger.Log(innerEx);
}
}
catch (Exception ex)
{
Logger.Log(ex);
}
}
private Task _task;
private static readonly ILogger Logger = Loggers.Logger.Instance;
}
}
用法,
BackgroundWorker.Run(() =>
BackGroundMethod();
);// run this in a background thread
因此,使用HostingEnvironment.QueueBackgroundWorkItem
比HostingEnvironment.RegisterObject
有任何好处。
QueueBackgroundWorkItem
实际上只是对RegisterObject
一个美化调用。 它处理将Stop
调用转换为CancellationToken ,可以由异步工作项使用,在发生故障时写入事件日志,以及其他一些簿记项。 它没有什么特别有意思的。 您可以使用Reflector或ILSpy浏览源代码,直到使用4.5.2源更新http://referencesource.microsoft.com/ 。
如果您对自己执行所有簿记的复杂性感到满意,那么您无法继续使用RegisterObject
。 新API适用于想要更简单一点的消费者。
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