它类似于许多问题,但不是很狡猾.我需要类似于
Winforms的BeginInvoke,但不仅仅适用于winforms.所以我需要单一的方法,适用于任何类型的应用程序,所以我打电话
void ExecuteInMainContext(Action action)
{
...
}
它应该工作,从控制台,winforms,Wpf等调用.我看到的所有方法都是使用BeginInvoke for winforms,Dispatcher.Invoke for WPF等.但我应该从库中调用它,我不知道从哪里调用它.并且它也应该对调用代码是透明的,因此它不应该传递类似于调用主线程等的指针,lib应该从环境中获取此信息,而不是从用户代码获取,当然也没有任何全局变量.
我试过使用Task.ConfigureAwait,但它没有帮助.
我发现了这个
You can’t do this (without a lot of work) in a Console application. The mechanisms built into the TPL for marshaling the call back onto a thread all rely on the thread having an installed SynchronizationContext. This typically gets installed by the user interface framework (ie: Application.Run in Windows Forms,or in WPF’s startup code,etc).
但我希望这是可能的.
测试代码：
using System;
using System.Threading;
namespace Test
{
class Program
{
private static void Main(string[] args)
{
Console.WriteLine("Main: " + Thread.CurrentThread.ManagedThreadId);
Publisher publisher = new Publisher(Method);
Console.ReadLine();
}
private static void Method(string s)
{
Console.WriteLine(s + " " + Thread.CurrentThread.ManagedThreadId);
}
}
class Publisher
{
public event Action<string> Action;
protected virtual void OnAction(string obj)
{
Action<string> handler = Action;
if (handler != null)
{
SafeCall(() => handler(obj));
}
}
private static void SafeCall(Action action)
{
// ???
action(); // should write 1
}
public Publisher(Action<string> action)
{
Action = action;
Console.WriteLine("Publisher thread: " + Thread.CurrentThread.ManagedThreadId);
Thread thread = new Thread(() => OnAction("hello"));
thread.Start();
}
}
}
所以应该在任何地方写相同的数字.
解决方法
试试这个
void ExecuteInMainContext(Action action)
{
var synchronization = SynchronizationContext.Current;
if (synchronization != null)
{
synchronization.Send(_ => action(),null);//sync
//OR
synchronization.Post(_ => action(),null);//async
}
else
Task.Factory.StartNew(action);
//OR
var scheduler = TaskScheduler.FromCurrentSynchronizationContext();
Task task = new Task(action);
if (scheduler != null)
task.Start(scheduler);
else
task.Start();
}
