在创建对象时和在调用方法以验证它不在多线程场景中使用时,是否足以比较ManagedThreadId？
public class SingleThreadSafe
{
private readonly int threadId;
public SingleThreadSafe()
{
threadId = Thread.CurrentThread.ManagedThreadId;
}
public void DoSomethingUsefulButNotThreadSafe()
{
if(threadId!=Thread.CurrentThread.ManagedThreadId)
{
throw new InvalidOperationException(
"This object is being accessed by a thread different than the one that created it. " +
" But no effort has been made to make this object thread safe.");
}
//Do something useful,like use a prevIoUsly established DbConnection
}
}
我的直觉往往是错误的线程,所以我想检查,看看是否有边缘案件我应该牢记.
解决方法
不,还不够！
托管线程ID可以由CLR重用,因此如果(threadId！= Thread.CurrentThread.ManagedThreadId)可以返回false,即使调用线程与构造对象的线程不同.
您通过参考比较可以实现您想要实现的目标：
if (!object.ReferenceEquals(Thread.CurrentThread,ThreadThatCreatedThis)) // ...
编辑：
MSDN然而说：
The value of the ManagedThreadId property does not vary over time,even if unmanaged code that hosts the common language runtime implements the thread as a fiber.
http://msdn.microsoft.com/en-us/library/system.threading.thread.managedthreadid%28v=vs.110%29.aspx
