模拟文件锁定时在 C# 中等待 File.Open
本质上，我有与此海报相同的问题，但在 C# 中： 等待文件可供 Win32 读取
更多信息：我们的一个项目中有调用 File.Open 的代码，当文件已经存在时，该代码偶尔会终止由另一个进程（编辑：或线程）打开：
FileStream stream = File.Open(m_fileName, m_mode, m_access);
/* do stream-type-stuff */
stream.Close();
File.Open将抛出一个IOException（目前正在悄悄地被某处吞噬），其< code>HResult 属性为 0x80070020 (ERROR_SHARING_VIOLATION)。我想要做的是这样的：
FileStream stream = null;
while (stream == null) {
try {
stream = File.Open(m_fileName, m_mode, m_access, FileShare.Read);
} catch (IOException e) {
const int ERROR_SHARING_VIOLATION = int(0x80070020);
if (e.HResult != ERROR_SHARING_VIOLATION)
throw;
else
Thread.Sleep(1000);
}
}
/* do stream-type-stuff */
stream.Close();
但是，HResult 是 Exception 的受保护成员，并且无法访问 - 代码不编译。是否有另一种方法可以访问 HResult，或者可能是我可以用来执行我想要的操作的 .NET 的另一部分？
哦，最后一个警告，这很奇怪：我仅限于使用 Visual Studio 2005 和 .NET 2.0。
I have, essentially, the same problem as this poster, but in C#: Waiting until a file is available for reading with Win32
More information: we have code that calls File.Open in one of our projects, that occasionally dies when the file is already opened by another process (EDIT: or thread):
FileStream stream = File.Open(m_fileName, m_mode, m_access);
/* do stream-type-stuff */
stream.Close();
File.Open will throw an IOException (which is currently quietly swallowed somewhere), whose HResult property is 0x80070020 (ERROR_SHARING_VIOLATION). What I would like to do is this:
FileStream stream = null;
while (stream == null) {
try {
stream = File.Open(m_fileName, m_mode, m_access, FileShare.Read);
} catch (IOException e) {
const int ERROR_SHARING_VIOLATION = int(0x80070020);
if (e.HResult != ERROR_SHARING_VIOLATION)
throw;
else
Thread.Sleep(1000);
}
}
/* do stream-type-stuff */
stream.Close();
However, HResult is a protected member of Exception, and cannot be accessed -- the code does not compile. Is there another way of accessing the HResult, or perhaps, another part of .NET I might use to do what I want?
Oh, one final caveat, and it's a doozy: I'm limited to using Visual Studio 2005 and .NET 2.0.
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您可以在
catch子句中调用Marshal.GetHRForException()来获取错误代码。无需反思：You can call
Marshal.GetHRForException()within thecatchclause to get the error code. No need for reflection:不幸的是，你最好的选择是使用反射。当然，由于您在两次尝试之间休眠 1 秒，因此性能成本很可能不会被注意到。
Your best bet is using reflection unfortunately. Of course, since you sleep for 1sec between attempts, the performance costs will most likely go unnoticed.