'using'语句保证对于对象将调用Dispose方法。在这个例子中,这没有发生。终结器方法也没有调用。
为什么会这样?当其他线程上可能发生异常时,我如何更改代码以保证处理我的对象?
class Program
{
static void Main(string[] args)
{
Thread th1 = new Thread(ThreadOne);
Thread th2 = new Thread(ThreadTwo);
th1.Start();
th2.Start();
th1.Join();
th2.Join();
}
static void ThreadOne()
{
using (LockedFolder lf = new LockedFolder(@"C:\SomeFodler"))
{
// some pay load
Thread.Sleep(5000);
}
}
static void ThreadTwo()
{
// some pay load
Thread.Sleep(1000);
throw new Exception("Unexpected exception");
}
}
public class LockedFolder : IDisposable
{
private const string FILENAME_LOCK = ".lock-file";
private bool bLocked = false;
public string FullPath { private set; get; }
public LockedFolder(string FullPath)
{
this.FullPath = FullPath;
Lock();
}
private void Lock()
{
// lock our folder
Console.WriteLine("Lock " + FullPath);
//CreateLockFile(Path + FILENAME_LOCK);
bLocked = true;
}
private void UnLock()
{
if (!bLocked)
{
Console.WriteLine("Already UnLocked " + FullPath);
return; // already unlocked
}
Console.WriteLine("UnLock " + FullPath);
// unlock our folder
//DeleteLockFile(Path + FILENAME_LOCK);
bLocked = false;
}
#region IDisposable Members
private bool disposed = false;
public void Dispose()
{
Dispose(true);
GC.SuppressFinalize(this);
}
public void Dispose(bool disposing)
{
if (!disposed)
{
if (disposing)
{
// Free managed resources
}
// Free unmanaged resource
UnLock();
}
disposed = true;
}
~LockedFolder()
{
Dispose(false);
}
#endregion
}
输出:
\Visual Studio 2010\Projects\ExceptionExample\ExceptionExample\bin\Debug>ExceptionExample.exe
Lock C:\SomeFodler
Unhandled Exception: System.Exception: Unexpected exception at ExceptionExample.Program.ThreadTwo() in \visual studio 2010\Projects\ExceptionExample\ExceptionExample\Program.cs:line 36 at System.Threading.ThreadHelper.ThreadStart_Context(Object state) at System.Threading.ExecutionContext.Run(ExecutionContext executionContext, ContextCallback callback, Object state, Boolean ignoreSyncCtx) at System.Threading.ExecutionContext.Run(ExecutionContext executionContext, ContextCallback callback, Object state) at System.Threading.ThreadHelper.ThreadStart()
输出无一异常(exception):
\Visual Studio 2010\Projects\ExceptionExample\ExceptionExample\bin\Debug>ExceptionExample.exe Lock C:\SomeFodler UnLock C:\SomeFodler
最佳答案
未处理的异常强制 CLR 终止进程。 .NET 4.0 的关机行为略有不同,终结器将在报告异常后运行。但在早期版本中没有。
您可以通过为 AppDomain.CurrentDomain.UnhandledException 编写事件处理程序来解决此默认行为。记录或报告异常并调用 Environment.Exit()。这允许终结器线程运行并调用您的 Unlock() 方法。
不要依赖于此,无论如何都会有像 StackOverflow 或 FEEE 这样令人讨厌的异常终止进程。是否有人被电源线绊倒或使用 Taskmgr.exe 击中您的进程
关于c# - 多线程异常和处置。为什么 Dispose 没有调用?,我们在Stack Overflow上找到一个类似的问题: https://stackoverflow.com/questions/5777204/