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Stephany Young向我提供了以下代码来计算我的程序创建的线程 。 Public Class MyThreadCount 私有共享m_lock作为新对象 私有共享m_threadcount为Int32 = 0 公共共享子增量（） SyncLock（m_lock） m_threadcount + = 1 结束SyncLock 结束子 公开共享子减量（） SyncLock（m_lock） m_threadcount - = 1 结束SyncLock 结束Sub 公共共享ReadOnly属性ThreadCount（）如Int32 获取 Dim _count为Int32 SyncLock （m_lock） _count = m_threadcount 结束SyncLock 返回_count 结束获取 结束物业 结束课程 我通过致电 mythreadcount.increment 使用它mythreadcount.decrement label1.text = mythreadcount.thr eadcount 一切都很好，但我想知道它是如何开始的。我的意思是 我猜是怎么加载的。为什么不需要我煽动它或 无论如何。在第一次引用类中的子类时，它如何知道何时将变量m_threadcount赋值给 0？

解决方案

也许我可以让它更清楚一些。我现在正在努力写一个类 非常像这样，除了它有1个子行写一行到 txt文件。 class sub writeline将从许多 并发运行的线程中调用。 我心中的疑问： 1.哪里打开文件 - 我希望它在每次写入之前保持打开状态不打开 。我想我想在构造函数中做到这一点？ 这个对吗？ Stephany的程序似乎没有构造函数。然而 不知何故它只将m_threadcount初始化为0一次。 2.如果Stephany的类中的对象，m_lock用于锁定sub 只有一个线程一次使用它可以递增或递减 计数。出于好奇的缘故，我的新课程也可以有一个名为m_lock的b $ b，它与mythreadcount中的一个分开工作吗？ 我知道我可以将其命名为其他东西。我想知道 m_lock在哪里可见。 2个类可以有名为m_lock的对象吗？它们不会互相干扰吗？ cj写道：

Stephany Young向我提供了以下代码计算由我的程序创建的线程。 Public Class MyThreadCount 私有共享m_lock作为新对象私有共享m_threadcount为Int32 = 0 公共共享子增量（） SyncLock（m_lock） m_threadcount + = 1 结束SyncLock 结束子 公共共享Sub Decrement（） SyncLock（m_lock） m_threadcount - = 1 结束SyncLock End Sub 公共共享ReadOnly属性ThreadCount（）As Int32 <获取 Dim _count为Int32 SyncLock（m_lock） _count = m_threadcount 结束SyncLock 返回_count 结束获取结束属性结束类 我通过调用 mythreadcount.increment 来使用它mythreadcount.decrement label1.text = mythreadcount.threadcount 一切都很好，但我想知道它是如何开始的。我的意思是我猜是怎么加载的。为什么我不需要煽动它或什么呢？怎么知道何时在第一次引用类中的子类时将变量m_threadcount分配给 0？

HI那里， 我想象代码中的某个地方实例化你的对象 喜欢： Dim mythreadcount作为New MyThreadCount 或者可以分两步完成，首先是调暗它（在内存中腾出空间），然后是然后实际实例化对象本身。 Dim mythreadcount为MyThreadCount mythreadcount = New MyThreadCount 希望有所帮助，Joe " cj" < cj@nospam.nospam>在消息中写道 新闻：uj ************* @ TK2MSFTNGP12.phx.gbl ...

Stephany Young向我提供了以下代码计算由我的程序创建的线程。 公共类MyThreadCount 私有共享m_lock作为新对象私有共享m_threadcount为Int32 = 0 公共共享子增量（） SyncLock（m_lock） m_threadcount + = 1 结束SyncLock 结束子 公共共享子递减（） SyncLock（m_lock） m_threadcount - = 1 结束SyncLock End Sub 公共共享ReadOnly属性ThreadCount（）As Int32 获取 Dim _count为Int32 SyncLock（m_lock） _count = m_threadcount 结束SyncLock 返回_count 结束获取结束属性 我通过调用 mythreadcount.increment mythreadcount.decrement来使用它 label1.text = mythreadcount.threadcount 一切都很好，但我想知道它是如何开始的。我的意思是我猜是怎么加载的。为什么我不需要煽动它或什么呢？如何在第一次引用类中的子元素时知道何时将变量m_threadcount赋值为 0？

" cj" < cj@nospam.nospam>在消息中写道 新闻：uj ************* @ TK2MSFTNGP12.phx.gbl ...

Stephany Young向我提供了以下代码计算由我的程序创建的线程。 公共类MyThreadCount 私有共享m_lock作为新对象私有共享m_threadcount为Int32 = 0 公共共享子增量（） SyncLock（m_lock） m_threadcount + = 1 结束SyncLock 结束子 公共共享子递减（） SyncLock（m_lock） m_threadcount - = 1 结束SyncLock End Sub 公共共享ReadOnly属性ThreadCount（）As Int32 获取 Dim _count为Int32 SyncLock（m_lock） _count = m_threadcount 结束SyncLock 返回_count 结束获取结束属性 我通过调用 mythreadcount.increment来使用 mythreadcount.decrement label1.text = mythreadcount.threadcount 一切都很好，但我想知道它是如何开始的。我的意思是如何装载我猜。为什么它不需要我煽动它或其他什么。它是如何知道何时在第一次引用类中的子类时将变量m_threadcount分配给0？ 实例和共享变量： msdn.microsoft/library/en...fvbspec7_5.asp Mythran

Stephany Young provided me with the following code to count threads created by my program. Public Class MyThreadCount Private Shared m_lock As New Object Private Shared m_threadcount As Int32 = 0 Public Shared Sub Increment() SyncLock (m_lock) m_threadcount += 1 End SyncLock End Sub Public Shared Sub Decrement() SyncLock (m_lock) m_threadcount -= 1 End SyncLock End Sub Public Shared ReadOnly Property ThreadCount() As Int32 Get Dim _count As Int32 SyncLock (m_lock) _count = m_threadcount End SyncLock Return _count End Get End Property End Class I use it by calling mythreadcount.increment mythreadcount.decrement label1.text=mythreadcount.threadcount Everything works great but I''m wondering how it gets started. I mean how is it loaded I guess. why doesn''t it need me to instigate it or whatever. how does it know when to assign the variable m_threadcount to 0 on the very first time a sub in the class is referenced?

解决方案

Maybe I can make this a bit clearer. I''m trying now to write a class very much like this except it will have 1 sub which writes a line to a txt file. The classes sub writeline will be called from withing many concurrently running threads. Questions in my mind: 1. Where do I open the file--I want it to stay open not be opened just prior to each write. I think I''d want to do that in a constructor? Is this right? Stephany''s program doesn''t seem to have a constructor. Yet somehow it initializes m_threadcount to 0 only once. 2. If the object in Stephany''s class, m_lock is used to lock the sub so only one thread uses it at a time can be incrementing or decrementing the count. Just for curiosity sake can my new class also have a object called m_lock that would work separately from the one in mythreadcount? I know I can name it something else. I''m trying to understand where m_lock is visible. Can 2 classes have objects named m_lock and they not interfere with each other? cj wrote:

Stephany Young provided me with the following code to count threads created by my program. Public Class MyThreadCount Private Shared m_lock As New Object Private Shared m_threadcount As Int32 = 0 Public Shared Sub Increment() SyncLock (m_lock) m_threadcount += 1 End SyncLock End Sub Public Shared Sub Decrement() SyncLock (m_lock) m_threadcount -= 1 End SyncLock End Sub Public Shared ReadOnly Property ThreadCount() As Int32 Get Dim _count As Int32 SyncLock (m_lock) _count = m_threadcount End SyncLock Return _count End Get End Property End Class I use it by calling mythreadcount.increment mythreadcount.decrement label1.text=mythreadcount.threadcount Everything works great but I''m wondering how it gets started. I mean how is it loaded I guess. why doesn''t it need me to instigate it or whatever. how does it know when to assign the variable m_threadcount to 0 on the very first time a sub in the class is referenced?

HI there, I imagine somewhere in that code is a line the instantiates your object like: Dim mythreadcount as New MyThreadCount Or could be done in 2 steps, first is dimming it (making space in memory), then the actual instantiation of the object itself. Dim mythreadcount as MyThreadCount mythreadcount = New MyThreadCount Hope that helps, Joe "cj" <cj@nospam.nospam> wrote in message news:uj*************@TK2MSFTNGP12.phx.gbl...

Stephany Young provided me with the following code to count threads created by my program. Public Class MyThreadCount Private Shared m_lock As New Object Private Shared m_threadcount As Int32 = 0 Public Shared Sub Increment() SyncLock (m_lock) m_threadcount += 1 End SyncLock End Sub Public Shared Sub Decrement() SyncLock (m_lock) m_threadcount -= 1 End SyncLock End Sub Public Shared ReadOnly Property ThreadCount() As Int32 Get Dim _count As Int32 SyncLock (m_lock) _count = m_threadcount End SyncLock Return _count End Get End Property End Class I use it by calling mythreadcount.increment mythreadcount.decrement label1.text=mythreadcount.threadcount Everything works great but I''m wondering how it gets started. I mean how is it loaded I guess. why doesn''t it need me to instigate it or whatever. how does it know when to assign the variable m_threadcount to 0 on the very first time a sub in the class is referenced?

"cj" <cj@nospam.nospam> wrote in message news:uj*************@TK2MSFTNGP12.phx.gbl...

Stephany Young provided me with the following code to count threads created by my program. Public Class MyThreadCount Private Shared m_lock As New Object Private Shared m_threadcount As Int32 = 0 Public Shared Sub Increment() SyncLock (m_lock) m_threadcount += 1 End SyncLock End Sub Public Shared Sub Decrement() SyncLock (m_lock) m_threadcount -= 1 End SyncLock End Sub Public Shared ReadOnly Property ThreadCount() As Int32 Get Dim _count As Int32 SyncLock (m_lock) _count = m_threadcount End SyncLock Return _count End Get End Property End Class I use it by calling mythreadcount.increment mythreadcount.decrement label1.text=mythreadcount.threadcount Everything works great but I''m wondering how it gets started. I mean how is it loaded I guess. why doesn''t it need me to instigate it or whatever. how does it know when to assign the variable m_threadcount to 0 on the very first time a sub in the class is referenced?

Instance and Shared Variables: msdn.microsoft/library/en...fvbspec7_5.asp Mythran