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我想弄清楚azure工作者角色如何启动RoleEnvironment事件以及这会如何影响字段访问。您可以从RoleEnvironment.OnRoleChanging事件处理程序中访问实例字段吗？
参考我下面的代码示例，我的理解是：
- 的RoleEnvironmentChanging和RoleEnvironmentChanged事件处理程序将在启动事件的线程的上下文中运行
- 事件线程会不同于被AutoResetEvent阻挡的线程
这是否意味着RoleEnvironmentChanged和OnStop将无法引用实例字段_someClass，我是否必须将它设置为stati C？或者事件处理程序在实例变量周围有一个闭包？
下面是一个简单的例子：
public abstract class WorkerRole : RoleEntryPoint
{
private readonly AutoResetEvent _eventHandler = new AutoResetEvent(false);
private SomeClass _someClass;
public override bool OnStart()
{
RoleEnvironment.Changing += RoleEnvironmentChanging;
RoleEnvironment.Changed += RoleEnvironmentChanged;
_someClass = new SomeClass();
return base.OnStart();
}
public override void OnStop()
{
// Tell the other class to stop
_someClass.Stop();
base.OnStop();
}
public override void Run()
{
// Start some process in another class that executes on a different thread internally.
_someClass.Run()
_eventHandler.WaitOne(); // Wait, so the method doesn't return and the role restart.
base.Run();
}
private void RoleEnvironmentChanging(object sender, RoleEnvironmentChangingEventArgs e)
{
e.Cancel = false // Never restart the role (just for this example)
}
void RoleEnvironmentChanged(object sender, RoleEnvironmentChangedEventArgs e)
{
_SomeClass.Refresh() // Just proving I can call this variable from here.
}
}